Remove the lens from your camera and attach the T-ring in its place. Since the T-ring is camera-brand specific, it will snap right on just like a lens. Next, remove the diagonal and visual back from the rear cell of your telescope. Screw the Celestron T-Adapter onto the rear cell threads until secure. Now, thread the T-ring & camera onto the T-Adapter. That’s all there is to it. The camera is now using your telescope as a giant telephoto lens. The magnification will depend on the telescope’s focal length. For instance, a 300 mm camera lens is considered to be pretty powerful, right? Well, if you are using an 8” SCT at prime focus, you’ve got yourself a 2000 mm lens with a lot of light-gathering capability!

Prime focus photography is popular for short exposure images of terrestrial objects as well as celestial objects like the Moon. If you want to do longer exposures of deep sky objects with this method, we suggest using a separate guidescope or off-axis guider and an equatorial mount.

Bintel T-Thread Spacer Ring Set allows you to adjust the spacing between standard M42 equipped accessories and CCD / DSLR cameras.

The Bintel T-Thread Spacer Ring Set includes 4 parts:

• 5mm spacer
• 10mm spacer
• 20mm spacer
• 30mm spacer
• Variable t-thread spacer and locking ring

Be sure to get exact spacing correct with the Bintel T-Thread SpacerSet

Made from black anodized aluminium and top quality machining on the threads.

Each adapter has male T2 thread to female T2 thread as used by most popular imaging accessories such as filter wheels, off axis guiders, focal reducers, field flatteners and so on.

M42 x 0.75 pitch

Celestron MAK T-Adapter NexStar 4SE

This sturdy aluminum T-Adapter is the accessory of choice if you’d like to attach an SLR or DSLR camera to the smaller rear cell threads of a Celestron NexStar 4SE telescope or C90 spotting scope for prime focus photography.

To get started, you’ll need the appropriate T-Ring for your camera body. Remove the lens from your camera and attach the T-ring in its place. Since the T-ring is camera-brand specific, it will snap right on just like a lens. Next, remove any accessories from the rear cell of your telescope.

Screw the Celestron NexStar 4SE T-Adapter onto the rear cell threads until secure. Now, thread the T-ring & camera onto the T-Adapter. That’s all there is to it. The camera is now using your telescope as a telephoto lens.

Prime focus photography is popular for short exposure images of terrestrial objects as well as celestial objects like the Moon.

Bintel 2 Inch-1.25 Inch adapter allows any 1.25" eyepieces and accessories to be used in 2" focusers, diagonals and barlows.

The Bintel 2 Inch-1.25 Inch eyepiece adapter includes a brass compression ring that holds the eyepiece and prevents marking of the eyepiece barrel by the metal set-screw.

It is precision machined from aircraft grade aluminium and anodized black. Threaded at rear to take M48 Filters

SKU: FF047

Celestron T-adapter EdgeHD 800

Celestron T-Adapter EdgeHD 800 threads onto the rear cell of the EDGE HD800 Scope

This gives 80mm worth of back spacing.

This T-Adapter allows you to attach your 35mm DSLR camera to the prime focus of your EdgeHD telescope. This arrangement is used for terrestrial photography and short exposure lunar and planetary photography. It can also be used for long exposure deep-sky photography when using a separate guidescope.

Both a T-Adapter and T-Ring are required to mount a DSLR camera to your instrument.

Bintel 48mm T-thread spacer set allows you to adjust the spacing between the newer M48 scopes and accessories and CCD / DSLR cameras and Wide 48mm T-Rings

The Bintel 48mm T-Thread Spacer set includes 4 parts:

• 5mm spacer
• 10mm spacer
• 20mm spacer
• 30mm spacer
• Variable t-thread spacer and locking ring

Be sure to get the exact spacing correct with the Bintel T-Thread SpacerSet

Made from black anodized aluminium and top quality machining on the threads.

Each adapter has male M48 thread to female M48 thread as used by many of the larger Refractor telescopes and imaging accessories.

M48x 0.75 pitch

SKU : FF358 FF360 FF361 FF362 FF363

ZWO T2 to T2 adapter

Picture this you have your camera with a female T-Thread how you need a Male T-Thread. You need the T2-T2 adapter ring.

A male to Male T-Thread ring that will only add 2mm to your image train

SKU: ZWO-T2-T2

ZWO-T2-M48 16.5mm Adapter has a male T thread (M42 x 0.75) on camera side and a female M48 (2″ Filter Thread or M48 x 0.75) thread on scope side and adds 16.5mm in length to your image train. This helps to get the correct spacings required for your camera to reach optimal focus.

Precision machined aluminium and black anodised for long life.

SKU: ZWO-M42-M48-16.5mm

Celestron T-adapter Edge HD 925, 1100, 1400

Celestron T-adapter Edge HD 925, 1100, 1400 suits these optical tubes. It threads onto the rear cell.

This T-Adapter allows you to attach your 35mm DSLR camera to the prime focus of your EdgeHD telescope.

This arrangement is used for terrestrial photography and short exposure lunar and planetary photography.

It can also be used for long exposure deep-sky photography when using a separate guidescope.

Both a T-Adapter and T-Ring are required to mount a 35mm SLR camera to your instrument.

The ZWO T2-T2 Extension 21mm is designed to help you to reach 55mm back focus distance

for example: attach the 21mm extender to ASI071 to reach 55mm back focus distance:17.5mm+21mm+16.5mm=55mm

SKU: ZWO-M42-M42-21mm

ZWO-T2-1.25-3mm Adapter

Your camera has a T-Thread at the front and you want to load an IR or CLS filter to it. By using the ZWO-T2-1.25 3mm adapter you screw it into the T-Thread on the camera and the 1.25" filter into the adapter. Leaving you enough T-Thread to load it onto your scope.

Name: T2-1.25″ Filter adapter

Thread: outer M42*0.75 male thread, inner M28.5*0.6 female thread

SKU: ZWO-T2-1.25-3

An extension tube can also be used for increasing image scale when doing projection photography.

SKU: FF115

A Visual Back is a metal adapter that screws onto the standard rear cell threads of Schmidt-Cassegrain and Maksutov-Cassegrain telescopes and accepts 1.25” accessories, including diagonals, eyepieces (for straight-through viewing), Barlows, webcams, and any other accessory with a 1.25” insert barrel.

All Celestron 5”, 6”, 8”, 9.25” and 11” Schmidt-Cassegrains come standard with the 1.25” Visual Back.

To use 2” diagonals on a Celestron 5” - 11” Schmidt-Cassegrain, remove the visual back and thread on a 2” diagonal made especially for Schmidt-Cassegrain telescopes, such as the Celestron 2” XLT Diagonal (#93527).

An extension tube can also be used for increasing image scale when doing projection photography.

SKU: FF113

The filter adapter ring that allows you to use the filter with a smaller filter thread size.

No need for buying another set of filter drawers, the 2”-1.25”filter adapter ring will help you directly fit the 1.25”filter onto 2” filter drawer or filter wheel.

Supported list:

ZWO 5×2”EFW

ZWO 7×2” EFW

ZWO filter drawer series, including M42 filter drawer and M54 filter drawer

The Tele Vue EBX-2120 2" Eyepiece Barrel Extender increases backfocus distance and provides a mounting location for 2" (48mm) eyepiece filters. It can also help parfocalize eyepiece sets. Extender adds 1.2-inches to the 2" barrel.

Models with dual 2" / 1¼" barrels can use the extender.

The EBX-2120 makes the 12mm approximately parfocal with the 17mm and 22mm Nagler Type-4 eyepieces when used in a Tele Vue 2" diagonal.

Because the field stop is located near the bottom of the chrome eyepiece barrel, you will need to rack your focuser out further, relative to most other eyepieces. If you find that you cannot rack your focuser out enough to achieve focus, Tele Vue strongly recommend you purchase the EBX-2120. This will make Tele Vue's 55mm Plössl eyepiece approximately parfocal with the Tele Vue 27mm Panoptic eyepiece.

To achieve the best astroimages, it is important to attain the proper back-focus distance for your camera relative to the telescope it is being used with. If the back-focus distance your camera consumes is not exact, the performance at the corners of full frame imaging sensors will suffer—stars will appear elongated and not as pinpoints.
Example: RASA 8 with a ZWO ASI 183 MC PRO camera

• Required back-focus distance for RASA 8 with included M42 camera adapter: 25mm
• Back-focus consumed by ZWO ASI 183 MC PRO camera: 17.5mm
• To achieve equal back-focus distance, a 7.5mm M42 spacer ring is required

Celestron’s M42 Spacer Ring kit includes three different length spacer rings to achieve the proper back-focus distance with our popular Celestron optical tubes and T-thread camera adapters.

How to Use
Depending your method of astrophotography (DSLR or CCD/CMOS), there are two ways to use the M42 Spacer Ring. If you are using a DSLR, place the desired M42 Spacer Ring between your T-Ring and your T-Adapter for your optical tube. If you are using a CCD or CMOS camera, place the desired M42 Spacer Ring between the camera and the T-Adapter for your optical tube.

Below is a quick guide to help you determine which spacer ring to use for our EdgeHD, Schmidt-Cassegrain, and RASA 8 optical tubes:

"Flat-top" model
A flat-top model allows closer placement of the eyepiece. Use with Newtonian reflectors, Tele Vue Paracorr, 2" Powermate, and 2" Big Barlow.

These adapters allows use of 1¼" eyepieces in any 2" focuser or diagonal.

All models feature brass clamp ring or nylon-tipped set screw for secure, no-mar locking and safety undercut.

Note: We purposely do not put 2" filter threads in 2" to 1¼" adapters. The reason is to avoid your getting upset when you insert a 1¼" Barlow and it crunches your expensive 2" filter. Safety first.

Tele Vue TRG-1072 Overview

ZWO T2-1.25 Inch Holder has M42 *0.75 (T-Thread) on each end,

Can be used to hold any 1.25" Accessory,.

Has Brass Compression Ring

Thumbscrews included

SKU: ZWO T2-1.25M

Standard 1.25″ T-adapter fits on any telescope that uses a 1.25″ eyepiece focuser for prime focus photography.

The standard 1.25″ T-adapter fits on any telescope that uses a 1.25″ eyepiece focuser for prime-focus photography. The T-mount is manufactured from durable metal aluminum alloy.

Made from high quality aluminium material, the William Optics 48mm T-mount is compatible with all Nikon Z Mirrorless Cameras.

Mounting : Nikon Z mount

Weight : 135g

Thread type: M48

The Bintel 2 inch Barrel has a standard SCT male thread (2”x 24tpi), is made of Aluminium, the inside is painted matt black and is threaded (M48 x 0.75) so it can take most brands of 2 inch filters.

If you have a Bintel 2inch SCT Mirror Diagonal and want to use in a refractor, then you simply unscrew SCT fitting and screw the 2” Barrel in its place. It can also be used as a replacement Barrel on Bintel /GSO 2”eyepieces.

SKU: FF060

ZWO M48 Male to M48 Female Extender 16.5mm

This ZWO adaptor helps you set your camera back spacing correctly for sharp astro images. 

It features a 21m spacer size, with 54mm fitting on the telescope side and 48mm for the camera.

Setting the right back spacing will help your astro imaging rig get the best from your telescope optics.

An extension tube can also be used for increasing image scale when doing projection photography.

SKU: FF262

Tele Vue 2 - 1.25 Inch Adapter, HiHat

The "high-hat" adapter is specially designed with a high rise head to keep Tele Vue Barlows and Powermate™ amplifiers away from the diagonal mirror.

This 2" to 1¼" adapter allows more in-travel for 1¼" eyepieces than our "flat-top" or "high-hat" adapters. This adapter is designed to attach to the 1¼" eyepiece barrel and convert the eyepiece for use with a 2" focuser or diagonal. The main application is for 1¼" eyepieces that may need more in-travel due to limited focuser range of your telescope.

The "In-Travel" model achieves the following amount of in-travel benefit compared to our conventional 2" to 1¼" adapters.

Tele Vue 0.8x Reducer Adapter to 2 Inch Focuser

This is a key component to the imaging system's versatility on non-"is" scopes. By placing the Imaging System Nosepiece for 2" Focuser in your standard 2" drawtube, you open up your telescope to accept the 2.4" Imaging System accessories and take advantage of the solid threaded connection.