New! ZWO off-axis guider (OAG) for astrophotography.
1. Calculate the correct distance for your imaging train. For example, you need to attach a 21mm extension to the ASI071 to reach 55mm back focus (17.5mm + 21mm + 16.5mm = 55mm).
2. Take off the guider prism part from the OAG and attach the OAG body to the telescope.
3. Insert the prism back into the OAG body.
4. Mount the guide camera.
5. Screw the T2 or M48 adapter on the imaging camera according to your cameras mounting type.
6. Mount the camera on to the OAG in the correct position and lock the 3 screws.
7. The final setup.
8. Check that the prism does not block the imaging area.
9. Use the guiding screw to adjust the guiding cameras focus. This is best done during daytime to make sure both the imaging and guiding cameras can focus at the same position.
|Average Rating (6 Reviews): |
Sunday, 7 August 2022 | Paul
I found that when the lock screws are tightened, the OAG can nove in its machined slot, which is obviously a big no no. Perhaps mine is faulty....
There is an additional grub screw which may need to be tweaked as well but if that doesn't help, please get in touch and we can run through some other things to try.
Friday, 18 March 2022 | Robert
Positive experience all around.Easy to set up during the day.Attain good guiding figures at night.There was less guide stars as is widely documented with OAGs but i had enough,at least with my chosen target(M51)in my field of view.Used with a QHY5L II MONO ( which i believe has the same sensor size as a asi120mm mini) and an eq5. sub arc second guiding all night @ 1280mm focal length.Thnks as always to flo for quick service.
Monday, 3 May 2021 | Andy
Fantastic service again from FLO. They are my go to supplier for all things telescope. The zwo oag was really easy to set up, just waiting for clear sky’s to give it a run.
Excellent quality from ZWO
Friday, 9 April 2021 | Paul
The ZWO off-axis guider is a lightweight, well constructed instrument. It was easy to incorporate into my current set up, simply replacing the 16.5mm spacer between my Skywatcher ED80 telescope and filter wheel. It arrived promptly from FLO in their usual high standard of packaging.
However in use things proved more tricky. Whereas my ZWO Miniscope picks up lots of stars and I get guiding straightaway, there are of course fewer stars with the OAG. Guiding with the ASIair, and ASI120MM guide stars are getting lost. I am still experimenting, but suspect unless you have a really dark sky the prospective guide star quickly gets lost in the 'murk' of light pollution etc. So the OAG loses a star in this review!
Saturday, 12 December 2020 | Nigel
I was having trouble with flexure using a WO 72mmX 420 guide scope, with my 8" edge HD. This was easy to install and immediately solved the problem. The guide stars look like bananas but is not effecting the guiding performance. I am using the asi120mm guide camera and need to run it with a very high gain to get more guide stars. The guiding figures are the same for both OAG and guide scope but my stars are now round and zero field drift.
Wednesday, 29 January 2020 | Trevor
I married this OHG to an Atik EFW2 filter wheel. I contemplated drilling and tapping the OHG body to make use of the three screws in the EFW. These screws are the ones used by Atik for their OHG.
In the end I ordered an male/female thread adapter from Flow. To be able to fix the orientation of the guide camera by setting the height of these three screws. Focusing has been initially set in daylight using a distant tree so we are waiting for clear night for further focusing and testing.