Hi I have fitted 'Bobs Knobs" to my Meade 8'' Lx90 and now I'm struggling with collimation.Apologies if this has been covered before i couldn't find it.
My set up is using an artificial star at the end of my garden, and using my DSLR to view the image as i adjust.I like the fact i can magnify the image.I do still have the f6.3 focal reducer fitted as well.
The problem im having is if i defocus one way(say forward) i can adjust the doughnut so all is central.Then as a double check ,i defocus the other way(rearward) and find that the doughnut is offset and appears to require adjusting.But if i adjust it it will be out the other way.Is it the way im setup? Am i adjusting incorrectly.?..Are you suppose to defocus in a particular way?i just don't know and hopefully someone on here will have experienced the same issue and can advise please.
Appreciate any help at all.Thanks