ZWO Off-Axis Guider with 1.25" Holder and M48 / M42 Threads
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- Lightweight and 16.5mm thick
- Prism size: 8x8mm
- Can be used to connect the main camera and guide camera simultaneously. No guide telescope required.
- Comes with M42 and M48 adapters for seamless connection to most telescopes and ZWO accessories
The ZWO Off Axis Guider offers the ability to autoguide with high precision and accuracy. The ZWO OAG improves tracking performance so you can expose longer and produce better astrophotography images. Off-axis guiders offer better performance over traditional guide scopes when used on longer focal length systems for three main reasons:
- Allows you to guide at the same focal length of your telescope which is critical for systems over 1000mm in focal length
- No guide scope means less weight riding on the telescope, which provides better tracking performance.
- Eliminates the possibility of flexure (slight sagging of the guide scope caused by gravity, which negatively affects guiding)
We strongly recommend pairing the ZWO OAG with the 1.25" helical focuser (PAF-ZW-HF1.25). This non-rotating helical focuser makes focusing the guide camera much easier. It threads directly on to the base of the OAG, and allows you to precisely dial in focus for your guide cam without the guesswork of sliding the guide camera in and out of the stock tube that comes with it.
ZWO OAG Compatibility
The OAG features adapters with M42 and M48 threads on both the telescope and camera sides, is currently natively compatible with the following cameras without the need for any separate adapters. Please see the product images at the top of this page for how to configure it with your camera.
- ASI2600MC Pro
- ASI294MC Pro
- ASI294MM Pro
- ASI533MC Pro
- ASI533MM Pro
- ASI183MC Pro
- ASI183MM Pro
- ASI071MC Pro
- ASI1600MM Pro
- ASI1600GT
- ASI183GT
ZWO OAG Compatible Guide Cameras
The ZWO OAG is compatible with ASI MINI guide cameras as well as ZWO lunar/planetary imaging cameras. When used with the addition of the helical focuser, only the ASI MINI cameras with the black nosepiece removed. The helical focuser is not compatible with ZWO planetary cameras that lack the "MINI" designation.
- ASI174MM-MINI
- ASI290MM-MINI
- ASI120MM-MINI
- 1.25" holder for 1.25" size body guide camera
- 5mm T2 extender for ASI guide camera whose back focus distance is 12.5mm such as ASI120, ASI224MC, ASI290 etc..
- M42 adapter for main imaging camera
- M48 adapter for main imaging camera
- OAG body with M48 telescope adapter
- M42 adapter for telescope
Please note: The guiding prism is attached to the holder by a few dabs of glue at its corners. Hence, it is very common to see black marks on the prism on its upper side (see last product photo above). This does not indiate a defective prism. The glue is outside the light path and will have no impact on performance.
Useful Resources
Usage Guide:
1. Please calculate the correct required distance for your imaging train at first.
(As an example, you need to attach a 21mm extender to an ASI071 to reach 55mm back focus. Distance: 17.5mm + 21mm + 16.5mm = 55mm)
2. Take off the guider prism part and attach the OAG body to the telescope.
3. Insert the prism part into the OAG body
4. Mount the guide camera
5. Screw the T2 or M48 adapter on the imaging camera according to your mounting type
6. Mount the camera on the OAG in the correct position and lock the 3 screws.
7. The final setup
Note: Please make sure that the prism doesn't block the imaging area
Use the guiding screw to adjust the guiding camera's focus
It is recommended to do this during the day to assure that the imaging and guiding camera can reach focus at the same position.
Other Information
- Country of Manufacture: China
The ZWO Off Axis Guider offers the ability to autoguide with high precision and accuracy. The ZWO OAG improves tracking performance so you can expose longer and produce better astrophotography images. Off-axis guiders offer better performance over traditional guide scopes when used on longer focal length systems for three main reasons:
- Allows you to guide at the same focal length of your telescope which is critical for systems over 1000mm in focal length
- No guide scope means less weight riding on the telescope, which provides better tracking performance.
- Eliminates the possibility of flexure (slight sagging of the guide scope caused by gravity, which negatively affects guiding)
We strongly recommend pairing the ZWO OAG with the 1.25" helical focuser (PAF-ZW-HF1.25). This non-rotating helical focuser makes focusing the guide camera much easier. It threads directly on to the base of the OAG, and allows you to precisely dial in focus for your guide cam without the guesswork of sliding the guide camera in and out of the stock tube that comes with it.
ZWO OAG Compatibility
The OAG features adapters with M42 and M48 threads on both the telescope and camera sides, is currently natively compatible with the following cameras without the need for any separate adapters. Please see the product images at the top of this page for how to configure it with your camera.
- ASI2600MC Pro
- ASI294MC Pro
- ASI294MM Pro
- ASI533MC Pro
- ASI533MM Pro
- ASI183MC Pro
- ASI183MM Pro
- ASI071MC Pro
- ASI1600MM Pro
- ASI1600GT
- ASI183GT
ZWO OAG Compatible Guide Cameras
The ZWO OAG is compatible with ASI MINI guide cameras as well as ZWO lunar/planetary imaging cameras. When used with the addition of the helical focuser, only the ASI MINI cameras with the black nosepiece removed. The helical focuser is not compatible with ZWO planetary cameras that lack the "MINI" designation.
- ASI174MM-MINI
- ASI290MM-MINI
- ASI120MM-MINI
- 1.25" holder for 1.25" size body guide camera
- 5mm T2 extender for ASI guide camera whose back focus distance is 12.5mm such as ASI120, ASI224MC, ASI290 etc..
- M42 adapter for main imaging camera
- M48 adapter for main imaging camera
- OAG body with M48 telescope adapter
- M42 adapter for telescope
Please note: The guiding prism is attached to the holder by a few dabs of glue at its corners. Hence, it is very common to see black marks on the prism on its upper side (see last product photo above). This does not indiate a defective prism. The glue is outside the light path and will have no impact on performance.
- Lightweight and 16.5mm thick
- Prism size: 8x8mm
- Can be used to connect the main camera and guide camera simultaneously. No guide telescope required.
- Comes with M42 and M48 adapters for seamless connection to most telescopes and ZWO accessories
The ZWO Off Axis Guider offers the ability to autoguide with high precision and accuracy. The ZWO OAG improves tracking performance so you can expose longer and produce better astrophotography images. Off-axis guiders offer better performance over traditional guide scopes when used on longer focal length systems for three main reasons:
- Allows you to guide at the same focal length of your telescope which is critical for systems over 1000mm in focal length
- No guide scope means less weight riding on the telescope, which provides better tracking performance.
- Eliminates the possibility of flexure (slight sagging of the guide scope caused by gravity, which negatively affects guiding)
We strongly recommend pairing the ZWO OAG with the 1.25" helical focuser (PAF-ZW-HF1.25). This non-rotating helical focuser makes focusing the guide camera much easier. It threads directly on to the base of the OAG, and allows you to precisely dial in focus for your guide cam without the guesswork of sliding the guide camera in and out of the stock tube that comes with it.
ZWO OAG Compatibility
The OAG features adapters with M42 and M48 threads on both the telescope and camera sides, is currently natively compatible with the following cameras without the need for any separate adapters. Please see the product images at the top of this page for how to configure it with your camera.
- ASI2600MC Pro
- ASI294MC Pro
- ASI294MM Pro
- ASI533MC Pro
- ASI533MM Pro
- ASI183MC Pro
- ASI183MM Pro
- ASI071MC Pro
- ASI1600MM Pro
- ASI1600GT
- ASI183GT
ZWO OAG Compatible Guide Cameras
The ZWO OAG is compatible with ASI MINI guide cameras as well as ZWO lunar/planetary imaging cameras. When used with the addition of the helical focuser, only the ASI MINI cameras with the black nosepiece removed. The helical focuser is not compatible with ZWO planetary cameras that lack the "MINI" designation.
- ASI174MM-MINI
- ASI290MM-MINI
- ASI120MM-MINI
- 1.25" holder for 1.25" size body guide camera
- 5mm T2 extender for ASI guide camera whose back focus distance is 12.5mm such as ASI120, ASI224MC, ASI290 etc..
- M42 adapter for main imaging camera
- M48 adapter for main imaging camera
- OAG body with M48 telescope adapter
- M42 adapter for telescope
Please note: The guiding prism is attached to the holder by a few dabs of glue at its corners. Hence, it is very common to see black marks on the prism on its upper side (see last product photo above). This does not indiate a defective prism. The glue is outside the light path and will have no impact on performance.
Useful Resources
Usage Guide:
1. Please calculate the correct required distance for your imaging train at first.
(As an example, you need to attach a 21mm extender to an ASI071 to reach 55mm back focus. Distance: 17.5mm + 21mm + 16.5mm = 55mm)
2. Take off the guider prism part and attach the OAG body to the telescope.
3. Insert the prism part into the OAG body
4. Mount the guide camera
5. Screw the T2 or M48 adapter on the imaging camera according to your mounting type
6. Mount the camera on the OAG in the correct position and lock the 3 screws.
7. The final setup
Note: Please make sure that the prism doesn't block the imaging area
Use the guiding screw to adjust the guiding camera's focus
It is recommended to do this during the day to assure that the imaging and guiding camera can reach focus at the same position.
Other Information
- Country of Manufacture: China
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ZWO Off-Axis Guider with 1.25" Holder and M48 / M42 Threads