I’m currently struggling with my EDGE H8 (and 0,7 reducer) and celestron OAG. When looping the guide camera I can see a few stars and I can get some proper focus (ASIAR PRO latest firmware). But wen I start calibrating (or guíding) those few stars disapear and I hardly get one or two, even cracking the gain up of the ZWO ASI 174mm to 400, and binning x2, and 3-4 secons exposure. I’ve tried pushing and pulling the OAG prism without success, and I've tried rotating de 174mm. For main camera I have a 294MM pro.

So stars are visible onscreen before the guiding process is started (not so may but a few), that shows the optical system is OK. If the stars disappear after the guiding process is started, ¿can it be some sort of camera control issue? There is nothing that physically changes in the reducer or OAG once the guiding process starts.

What can I do? Any tips?

Thanks in advance

    Agepi7o Are you sure the guide camera is in focus?

    Are you using the Guiding Dark Library. You can try to turn it off, the wrong Dark Library will affect the guide star image

        PMTeam@ZWO Yes, I was. I'm gonna try again without the dark library...or should I build a new one?
        Thanks

          11 days later

          I tried without the dark library and it was much better, I could get 3-4 stars with 3-4 segs exposure, enough for 0,7-0,9 guiding rate (Skywatcher eq6-r-pro). I'm expecting next week my new ZWO AM5, and I will have to figure out how to maintain short guide exposures ( as far as I understand it is a must with de AM5) and getting to see stars with de OAG.....

          Thanks again

          Hi, If you use OAG guides, a bad dark library will hurt guiding more than using a guiding scope. Please make sure that you create a dark library with no light.

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