Quote:
Originally Posted by gregbradley
Sounds like you need a variable length adapter and then you fine tune it by trial and error.
I think there are some like this stock from some suppliers but Ashley may be able to make a variable one that suits your setup. If it has a range of say 20mm you should be able to nail it.
If its getting better as you go shorter then I suppose you need to go even shorter.
Of course you are assuming the corrector works perfectly at a certain distance. We aren't talking Takahashi, AP or APM quality here so there is a chance the corrector is not up to the job. Full frame is pretty demanding on the optics in my experience. But if changing the distance is getting an improvement then the variable approach is the way to go (2 adapters one that slides into the other and can be locked down).
Looking at your corners at an educated guess that looks like more than 3mm error in the spacing. More like 5-10mm.
What percentage did it change when you reduced the spacing by 3mm?
Greg.
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TS Optical did some measurements and came up with the last back focus length. Apparently some optical tech said it would be right this time.
You could be right about it being more. The improvement over the field has been about 94% looking corrected rather than about 50%.
You could be right, the flattener might not be up to what is being stated on their website but I have seen an image taken with a STL11K and this flattener on a GSO RC12 and it looked really good.
Yes a sliding adapter might be ok, but I have put the ball in their court for the moment and I have an acceptable level of correction at present.
I am with you 100% about sensor size. This camera is not for this scope long term, but now this scope has to fill my wants.