Quote:
Originally Posted by alpal
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Thanks Allan, looks good, I'd still need an adapter made to go either side of it though...
Quote:
Originally Posted by gregbradley
Erik,
Are you sure you even need a flattener with a KAF8300 camera? That is a fairly small sensor and field flatteners may only be needed around APS and full frame sensor sizes only in many scopes.
Greg.
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That was my thought also at first, but without it there is quite a noticeable amount of distortion around the image.
I have tried Troys method of inspecting subs at different spacings, and the star shapes do vary between the different lengths. My method for inspection was a little 'lazy' mainly visual, and I managed to get round stars all around the image. I did notice a change in the FWHM also, but I think the seeing may have played a part there also.
The specified 106.2mm seems to work well, but I did get very similar FWHM values at 106.5mm-108.5mm spacings. Which is promising I guess, as there may be a fairly high amount of tolerance? I was using a tape measure, but I'll invest in a pair of callipers and double checking before ordering anything.
I will have some photos to post a bit later!
Erik