SPX 300 imaging sweet spot

[neil phillips]

I have noticed when imaging one can get a sweet spot on screen where the image tends to be sharper ( I noticed this with my old 10" Europa ) but on this system the effect seems worse with only really sharp frames occuring about 3 quaters of the way up to the top of the pc screen, could this be a collimation problem ? Or a mirror cell holding problem, or something else? Cheers for any help

[acey]

I'm not an imager but I know that as F-ratio goes down you get a smaller margin of error in collimation and a greater degree of coma away from centre of field. If you've moved from F4.8 to F4 then that could be the cause. Collimation can bring the sweet spot to the centre but won't eliminate coma away from centre.

[acey]

Correction - I just realised from another post that you've got the F6 version. So my suggestion can't be right.

[neil phillips]

Hi Acey no worries at least you tried, i was hoping i might get some info on my focussing problems, as its quite a seriouse issue for me. I will have to write down all the effects and send the info to Orion