Plus sky events, new gear and expert tips.
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ZWO
$319.00
The ASI120MM Mini captures the guide-star frames your software uses to measure drift and send tracking corrections to your mount.
The 1280 × 960 monochrome sensor uses 3.75 µm pixels to sample the guide-star image. A guide scope gives the camera its own view of the sky. An off-axis guider picks up starlight through the main telescope. The guide field depends on the focal length and optical path.
The Mini also records monochrome planetary frames. Use a smaller region of interest when the planet fits inside it and you want more frames per second. At full resolution, ZWO’s USB 2.0 Normal Mode figures are 30 fps in RAW8 and 17.5 fps in RAW16. The capture-mode specifications list the smaller frame sizes.
Quantum efficiency (QE) is the share of photons that the sensor converts into signal. The AR0130CS curve peaks just under 80% near 580 nm, then falls towards the near infrared.
Each plot uses the same gain setting along its horizontal axis. As gain rises, the read noise drops and bright pixels saturate sooner.
Signal a pixel can hold before saturation. The chart starts at 14,500 electrons at gain 0 and falls as gain rises. The vertical scale is logarithmic.
Electrons per digital count, or e⁻/ADU. The curve passes near one electron per count around gain setting 29.
The span from the noise floor to saturation. The chart falls from about 11 stops at gain 0 to about 6 at gain 100.
Noise added when the sensor is read. The chart drops in steps from about 6.4 e⁻ RMS at gain 0 to about 3.6 e⁻ RMS at gain 100.
Lower gain leaves more headroom for bright stars. Higher gain can help when read noise matters in short captures and the target stays below saturation.
The resolution rows give ZWO’s frame rates for USB 2.0 Normal Mode with a 12-bit ADC. RAW16 and RAW8 are the output formats.
Avoid corrosive cleaning solutions. For solar imaging, use purpose-built solar equipment and follow its safety instructions.
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The ASI120MM Mini captures the guide-star frames your software uses to measure drift and send tracking corrections to your mount.
The 1280 × 960 monochrome sensor uses 3.75 µm pixels to sample the guide-star image. A guide scope gives the camera its own view of the sky. An off-axis guider picks up starlight through the main telescope. The guide field depends on the focal length and optical path.
The Mini also records monochrome planetary frames. Use a smaller region of interest when the planet fits inside it and you want more frames per second. At full resolution, ZWO’s USB 2.0 Normal Mode figures are 30 fps in RAW8 and 17.5 fps in RAW16. The capture-mode specifications list the smaller frame sizes.
Quantum efficiency (QE) is the share of photons that the sensor converts into signal. The AR0130CS curve peaks just under 80% near 580 nm, then falls towards the near infrared.
Each plot uses the same gain setting along its horizontal axis. As gain rises, the read noise drops and bright pixels saturate sooner.
Signal a pixel can hold before saturation. The chart starts at 14,500 electrons at gain 0 and falls as gain rises. The vertical scale is logarithmic.
Electrons per digital count, or e⁻/ADU. The curve passes near one electron per count around gain setting 29.
The span from the noise floor to saturation. The chart falls from about 11 stops at gain 0 to about 6 at gain 100.
Noise added when the sensor is read. The chart drops in steps from about 6.4 e⁻ RMS at gain 0 to about 3.6 e⁻ RMS at gain 100.
Lower gain leaves more headroom for bright stars. Higher gain can help when read noise matters in short captures and the target stays below saturation.
The resolution rows give ZWO’s frame rates for USB 2.0 Normal Mode with a 12-bit ADC. RAW16 and RAW8 are the output formats.
Avoid corrosive cleaning solutions. For solar imaging, use purpose-built solar equipment and follow its safety instructions.
