Detec

I will have a look at that Pierre, Thank you.

From what you both say, it seems I have a lot of learning to do If I want better images. Trouble is im nearly seventy and anything I seem to learn nowadays only stays in there for about two days. Chemo brain I think.😁 But thank you both for the extremely thorough replies. Very helpful.

HI, Thanks for that thorough explanation. That makes sense to me. I dont really fancy guiding because my garden is very open to the public, and if I left a laptop outside and I go inside like I normally do, there would be no laptop. So I will look into this PEC that you are talking about. Thanks for your help.

Hi Guys, I am new here this is my first post. I have a problem that is driving me mad and I cant seem to correct it no matter what, so I need more information from people that know. I polar align my HEQ5 pro mount, then I star align it ok. I focus the scope , then start doing 1 minute subs. The first image is clear with pinpoint stars, then the second slightly moves diagonally and the stars are not round, then the third image is worse. By about the fourth image the stars are pinpoint again. Then its starts going diagonally back the oposite way, slightly oval stars then worse stars, then pinpoint perfect again. The the cycle begins again. So I get 2 good images in about six or seven subs. If the polar alignment was out I wouldnt get any good stars. I have belt modded the mount but this makes no difference. There was a very slight movement in the one axis which I thought might be causing it so I followed the instructions on line which showed me how to fix this. But this also did not change anything. The scope I am using is a celestron C8. I thought this might be causing it due to such a large focal length so I purchased a focal reducer hoping the new focal length of the scope would make smaller problems for me. But still the same. Sorry for such a long post, I have one final thing to say. If I use my zenithstar 61 from FLO, this movement problem still remains but is greatly reduced, so I get more good subs. Is my mount just faulty? Or is this normal?.Or am I doing something wrong? I dont do guiding because I dont have a guide scope or laptop. And the light polution is so bad in my area I dont think longer subs would be any good. Any ideas?