{"product_id":"planewave-deltarho-280","title":"PlaneWave DeltaRho 280 Argus Astrograph","description":"\u003cdiv class=\"bintel-dr280-argus-page\"\u003e\n\n\u003cstyle\u003e\n.bintel-dr280-argus-page {\n  --black: #000000;\n  --ink: #1D1D1F;\n  --paper: #F5F5F7;\n  --white: #FFFFFF;\n  --mute: #86868B;\n  --line: #D2D2D7;\n  --link: #0066CC;\n  --accent: #1B3A6B;\n  --radius: 22px;\n  --radius-lg: 28px;\n  font-family: -apple-system, BlinkMacSystemFont, \"SF Pro Display\", \"SF Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n  font-weight: 400;\n  color: var(--ink);\n  background: var(--white);\n  line-height: 1.47;\n  letter-spacing: -0.003em;\n  -webkit-font-smoothing: antialiased;\n  -moz-osx-font-smoothing: grayscale;\n  overflow-x: hidden;\n}\n.bintel-dr280-argus-page img { max-width: 100%; height: auto; }\n.bintel-dr280-argus-page .dr280-section { padding: 120px 22px; }\n@media (max-width: 640px) { .bintel-dr280-argus-page .dr280-section { padding: 80px 22px; } }\n.bintel-dr280-argus-page .dr280-on-dark { background: var(--black); 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letter-spacing: 0.04em; color: var(--ink); }\n@media (max-width: 640px) { .bintel-dr280-argus-page .dr280-specs-row { font-size: 15px; padding: 14px 0; } }\n@media (max-width: 380px) { .bintel-dr280-argus-page .dr280-specs-row { font-size: 13.5px; padding: 10px 0; } }\n.bintel-dr280-argus-page .dr280-highlights { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 48px; max-width: 1000px; margin: 0 auto; }\n.bintel-dr280-argus-page .dr280-highlight-item { display: flex; gap: 14px; align-items: flex-start; }\n.bintel-dr280-argus-page .dr280-tick { width: 24px; height: 24px; flex-shrink: 0; color: var(--ink); margin-top: 2px; }\n@media (max-width: 700px) { .bintel-dr280-argus-page .dr280-highlights { grid-template-columns: 1fr; } }\n.bintel-dr280-argus-page .dr280-link { color: var(--link); font-size: 17px; display: inline-flex; align-items: center; gap: 4px; padding: 10px 4px; min-height: 44px; text-decoration: none; }\n.bintel-dr280-argus-page .dr280-link svg { width: 18px; height: 18px; }\n.bintel-dr280-argus-page .dr280-closing { text-align: center; }\n.bintel-dr280-argus-page .dr280-closing h2 { max-width: 820px; margin: 0 auto 56px; }\n.bintel-dr280-argus-page .dr280-perks { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; max-width: 1000px; margin: 0 auto; }\n.bintel-dr280-argus-page .dr280-perk-t { font-size: 17px; font-weight: 600; color: var(--ink); }\n.bintel-dr280-argus-page .dr280-perk-s { font-size: 14px; color: var(--mute); margin-top: 4px; }\n@media (max-width: 1024px) { .bintel-dr280-argus-page .dr280-perks { grid-template-columns: repeat(2, 1fr); } }\n.bintel-dr280-argus-page .dr280-specs-heading { text-align: center; margin-bottom: 56px; }\n\u003c\/style\u003e\n\n\u003csection class=\"dr280-section dr280-on-dark\" style=\"text-align:center;\"\u003e\n  \u003cdiv style=\"max-width:900px;margin:0 auto;\"\u003e\n    \u003cdiv class=\"dr280-eyebrow\" style=\"color:#98989D;margin-bottom:24px;\"\u003ePlaneWave DeltaRho 280 Argus\u003c\/div\u003e\n    \u003ch2 class=\"dr280-hero-h2\" style=\"color:var(--white);margin-bottom:32px;\"\u003e\n      \u003cspan class=\"dr280-grad\"\u003ef\/2.75.\u003c\/span\u003e\u003cbr\u003eWhat used to take a week now takes a night.\n    \u003c\/h2\u003e\n    \u003cp class=\"dr280-lead\" style=\"color:#A1A1A6;max-width:680px;margin:0 auto 40px;\"\u003eThe DeltaRho 280 Argus is PlaneWave’s observatory-class wide-field astrograph for serious imagers and sky-survey programmes. Fused silica quartz mirrors, a carbon fibre OTA, and a 55 mm image circle at f\/2.75 — 280 mm of aperture that turns nights of integration into a few productive hours.\u003c\/p\u003e\n    \u003cdiv style=\"display:flex;gap:20px;justify-content:center;flex-wrap:wrap;\"\u003e\n      \u003ca href=\"#dr280-features\" class=\"dr280-link\" style=\"color:#98CBFF;\"\u003eExplore features\n        \u003csvg viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"9 6 15 12 9 18\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003c\/a\u003e\n      \u003ca href=\"#dr280-specs\" class=\"dr280-link\" style=\"color:#98CBFF;\"\u003eView specifications\n        \u003csvg viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"9 6 15 12 9 18\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section dr280-paper\"\u003e\n  \u003cdiv class=\"dr280-stats\"\u003e\n    \u003cdiv class=\"dr280-stat\"\u003e\n\u003cdiv class=\"dr280-stat-num\"\u003e280\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-lbl\"\u003emm aperture\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-cap\"\u003e11 inches of light-gathering\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-stat\"\u003e\n\u003cdiv class=\"dr280-stat-num\"\u003ef\/2.75\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-lbl\"\u003efocal ratio\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-cap\"\u003e13x faster than f\/10\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-stat\"\u003e\n\u003cdiv class=\"dr280-stat-num\"\u003e55\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-lbl\"\u003emm image circle\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-cap\"\u003eFull-frame and beyond\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-stat\"\u003e\n\u003cdiv class=\"dr280-stat-num\"\u003e4.0\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-lbl\"\u003eμm RMS on-axis\u003c\/div\u003e\n\u003cdiv class=\"dr280-stat-cap\"\u003eObservatory-class sharpness\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section dr280-pullquote\"\u003e\n  \u003cp\u003ef\/2.75 is not just fast. \u003cspan class=\"dr280-mute\"\u003eIt is the difference between finishing a target tonight and coming back next month.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section dr280-on-dark\" id=\"dr280-features\"\u003e\n  \u003cdiv class=\"dr280-bento\"\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-3\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003eOptical speed\u003c\/div\u003e\n      \u003ch3 class=\"dr280-bento-h\"\u003e13× faster than f\/10. Every photon counts more.\u003c\/h3\u003e\n      \u003cp class=\"dr280-body\"\u003eAt f\/2.75, the DeltaRho 280 gathers light 13 times faster than an f\/10 instrument of identical aperture. That is not an incremental advantage — it is the difference between a productive one-hour session and a week of cloud-interrupted integration. Research programmes and sky surveys that would otherwise take months become achievable in a single season.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-3\"\u003e\n      \u003cdiv class=\"dr280-big-number\"\u003e55\u003c\/div\u003e\n      \u003cp class=\"dr280-body\"\u003emm image circle — large enough to cover full-frame sensors and beyond, with sharp stars from centre to corner at 4.5 μm RMS or better at 27.5 mm off-axis.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-2\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003eMirrors\u003c\/div\u003e\n      \u003ch3 class=\"dr280-bento-h\"\u003eFocus stays locked. All night.\u003c\/h3\u003e\n      \u003cp class=\"dr280-body\"\u003ePrimary and secondary mirrors are optical-grade fused silica quartz — near-zero thermal expansion, the same material used in premier research observatories. As temperature drops through the night, conventional glass mirrors shift focus. The DR280’s quartz mirrors do not.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-2\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003eStructure\u003c\/div\u003e\n      \u003ch3 class=\"dr280-bento-h\"\u003eStiff where it matters. Light where it counts.\u003c\/h3\u003e\n      \u003cp class=\"dr280-body\"\u003eCarbon fibre delivers exceptional torsional rigidity with minimal mass. At 14.5 kg for a 451 mm OTA, the DR280 is a 280 mm instrument that mounts on observatory-class and high-end portable mounts alike — without needing a counterweight upgrade.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-2\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003eFocal plane adjustment\u003c\/div\u003e\n      \u003ch3 class=\"dr280-bento-h\"\u003eSensor alignment without shimming or guesswork.\u003c\/h3\u003e\n      \u003cp class=\"dr280-body\"\u003eThe integrated tip-tilt focal plane adjuster lets you dial in perfect sensor tilt with precision — no shims, no trial-and-error. It is consistent, repeatable, and done in minutes at the start of any session.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-3\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003eField of view\u003c\/div\u003e\n      \u003ch3 class=\"dr280-bento-h\"\u003eThe Heart Nebula. In one frame.\u003c\/h3\u003e\n      \u003cp class=\"dr280-body\"\u003eThe 770.6 mm focal length paired with the 55 mm image circle delivers over 4 degrees of field of view. Large nebula complexes, galaxy groups, and wide-field targets that require mosaics on narrow-field systems fit comfortably into a single frame — or anchor a multi-panel survey.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-bento-card dr280-span-3\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003eDew control\u003c\/div\u003e\n      \u003ch3 class=\"dr280-bento-h\"\u003eDew control built in. Session-ending fog, ruled out.\u003c\/h3\u003e\n      \u003cp class=\"dr280-body\"\u003eIntegrated dew control heater technology keeps the optical path clear on humid Australian nights. One less cable to run, one less failure point — the DR280 keeps imaging when lesser rigs fog out and call it a night.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section\"\u003e\n  \u003cdiv class=\"dr280-split\"\u003e\n    \u003cdiv class=\"dr280-split-text\"\u003e\n      \u003cdiv class=\"dr280-eyebrow\"\u003ePrecision collimation\u003c\/div\u003e\n      \u003ch2 class=\"dr280-h2\"\u003eCollimation solved. \u003cspan class=\"dr280-mute\"\u003eFrom first session to thousandth.\u003c\/span\u003e\n\u003c\/h2\u003e\n      \u003cp class=\"dr280-body\"\u003eThe DeltaRho 280 ships with PlaneWave’s collimation software that walks you through mirror alignment step by step — no iterative star-testing, no guesswork. Set it once: the rigid carbon fibre structure holds alignment through the night. The low-profile focuser delivers 0.5 inches of travel from a 163 mm back focus distance, giving your imaging train room to breathe.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cimg class=\"dr280-split-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/planewave-deltarho-280-argus-hero.webp?v=1779515988\" alt=\"PlaneWave DeltaRho 280 Argus astrograph on mount, carbon fibre optical tube assembly\" loading=\"lazy\"\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-cinema dr280-on-dark\"\u003e\n  \u003cdiv class=\"dr280-cinema-cap\"\u003e\n    \u003cspan class=\"dr280-eyebrow\"\u003eSample imaging\u003c\/span\u003e\n    \u003ch2 class=\"dr280-h2 dr280-grad\"\u003eM51. The Whirlpool Galaxy.\u003c\/h2\u003e\n    \u003cp class=\"dr280-body\" style=\"color:#A1A1A6;\"\u003eGalaxy arms, tidal bridges, and foreground stars resolved in a single short session. At f\/2.75, integration time that would fill a week on a slower system compresses to a few productive hours.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cimg class=\"dr280-cinema-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/planewave-deltarho-280-sample-m51-whirlpool.webp?v=1779515988\" alt=\"M51 Whirlpool Galaxy imaged with PlaneWave telescope, showing spiral arms and NGC 5195 companion\" loading=\"lazy\"\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-cinema dr280-on-dark\" style=\"padding-top:60px;\"\u003e\n  \u003cdiv class=\"dr280-cinema-cap\"\u003e\n    \u003cspan class=\"dr280-eyebrow\"\u003eEmission nebula\u003c\/span\u003e\n    \u003ch2 class=\"dr280-h2 dr280-grad\"\u003eIC 1805. The Heart Nebula.\u003c\/h2\u003e\n    \u003cp class=\"dr280-body\" style=\"color:#A1A1A6;\"\u003eH-alpha, RGB narrowband composite. The 4-degree–plus field captures the Heart Nebula’s full complex and surrounding star-forming regions in a single pointing — a target that demands a mosaic from slower, narrower systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cimg class=\"dr280-cinema-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/planewave-deltarho-280-sample-ic1805-heart-nebula.webp?v=1779515988\" alt=\"IC 1805 Heart Nebula captured with PlaneWave astrograph, wide-field narrowband imaging\" loading=\"lazy\"\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section\"\u003e\n  \u003cdiv style=\"text-align:center;max-width:820px;margin:0 auto 56px;\"\u003e\n    \u003cdiv class=\"dr280-eyebrow\"\u003eWhy the DeltaRho 280\u003c\/div\u003e\n    \u003ch2 class=\"dr280-h2\"\u003eBuilt for imagers who treat every clear night as a resource. \u003cspan class=\"dr280-mute\"\u003eNothing wasted.\u003c\/span\u003e\n\u003c\/h2\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"dr280-highlights\"\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003e280 mm (11″) aperture with fused silica (quartz) primary and secondary mirrors for temperature-stable performance\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003ef\/2.75 focal ratio — 13 times faster than f\/10, reducing required integration time dramatically\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003e55 mm image circle at 4.0 μm RMS on-axis and 4.5 μm RMS at the full 27.5 mm off-axis radius\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003eIntegrated tip-tilt focal plane adjuster for precise sensor alignment without physical shimming\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003eCarbon fibre optical tube — 451 mm OTA, 14.5 kg total weight for use on observatory-class mounts\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003eBuilt-in dew control heater and broadband AR coatings (\u0026lt;1% reflection, 400–800 nm) for consistent all-weather performance\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003e4°+ field of view capability with a 55 mm sensor — ideal for large nebula complexes and sky surveys\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dr280-highlight-item\"\u003e\n      \u003csvg class=\"dr280-tick\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpolyline points=\"20 6 9 17 4 12\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n      \u003cp class=\"dr280-body\"\u003eCompatible with PlaneWave L350 Direct Drive Mount — designed as an integrated professional imaging system\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section dr280-paper\" id=\"dr280-specs\"\u003e\n  \u003cdiv class=\"dr280-specs-heading\"\u003e\n    \u003cdiv class=\"dr280-eyebrow\"\u003eTechnical specifications\u003c\/div\u003e\n    \u003ch2 class=\"dr280-h2\"\u003eEvery number that matters.\u003c\/h2\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"dr280-specs\"\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003eOptical system\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eOptical design\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eCorrected Cassegrain astrograph (DeltaRho)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eAperture\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e280 mm (11 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eFocal length\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e770.6 mm\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eFocal ratio\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003ef\/2.75\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eImage circle\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e55 mm\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eCentral obstruction\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e63%\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eOptical performance (on-axis)\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e4.0 μm RMS\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eOptical performance (21 mm off-axis)\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e4.1 μm RMS\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eOptical performance (27.5 mm off-axis)\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e4.5 μm RMS\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003ePrimary mirror\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eOptical diameter\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e280 mm (11 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eShape\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eAspheric\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eMaterial\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eFused silica (quartz)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eCoating\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eEnhanced aluminium (360–820 nm optimised)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003eSecondary mirror\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eDiameter\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e170 mm (6.7 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eShape\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eSpherical\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eMaterial\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eFused silica (quartz)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eCoating\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eEnhanced aluminium (360–820 nm optimised)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003eLens group (upper cage)\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eDiameter\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e120 mm (4.72 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eMaterial\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eCarbon fibre tube\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eCoating\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eBroadband AR (\u0026lt;1% reflection, 400–800 nm)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003eFocuser and back focus\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eBack focus (mounting surface)\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e163 mm (6.4 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eBack focus (racked-in focuser)\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e108 mm (4.25 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eFocuser travel\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e0.5 in (low-profile)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003ePhysical\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eOTA length\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e451 mm (17.75 in)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eTotal OTA length (including focuser)\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e467 mm\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eWeight\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003e14.5 kg (32 lb)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eTube construction\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eCarbon fibre\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003eAdditional features\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eDew control\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eIntegrated heater technology\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eFocal plane adjustment\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eBuilt-in tip-tilt adjuster\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eCollimation\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eUser-friendly software-assisted\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eRecommended mount\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003ePlaneWave L350 Direct Drive Mount\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-cat\"\u003eIn the box\u003c\/div\u003e\n    \u003cdiv class=\"dr280-specs-row\"\u003e\n\u003cdiv class=\"dr280-specs-label\"\u003eIncluded\u003c\/div\u003e\n\u003cdiv class=\"dr280-specs-value\"\u003eOTA cover, hex wrench set\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"dr280-section dr280-paper dr280-closing\"\u003e\n  \u003ch2 class=\"dr280-h2\"\u003eProfessional imaging. \u003cspan class=\"dr280-mute\"\u003eBacked by Australia’s telescope authority.\u003c\/span\u003e\n\u003c\/h2\u003e\n  \u003cdiv class=\"dr280-perks\"\u003e\n    \u003cdiv class=\"dr280-perk\"\u003e\n\u003cdiv class=\"dr280-perk-t\"\u003eAustralian warranty\u003c\/div\u003e\n\u003cdiv class=\"dr280-perk-s\"\u003eFull local cover\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-perk\"\u003e\n\u003cdiv class=\"dr280-perk-t\"\u003eShips from Sydney\u003c\/div\u003e\n\u003cdiv class=\"dr280-perk-s\"\u003eFrom local stock\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-perk\"\u003e\n\u003cdiv class=\"dr280-perk-t\"\u003eExpert advice\u003c\/div\u003e\n\u003cdiv class=\"dr280-perk-s\"\u003eFrom working astronomers\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"dr280-perk\"\u003e\n\u003cdiv class=\"dr280-perk-t\"\u003e40+ years\u003c\/div\u003e\n\u003cdiv class=\"dr280-perk-s\"\u003eIn Australian astronomy\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c\/div\u003e","brand":"Planewave","offers":[{"title":"Default Title","offer_id":44978384830533,"sku":"11001002","price":15049.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/planewave-deltarho-280-argus-main.webp?v=1779515154","url":"https:\/\/bintel.com.au\/products\/planewave-deltarho-280","provider":"The Binocular and Telescope Shop","version":"1.0","type":"link"}