Quote:
Originally Posted by Shiraz
exactly the point Greg. FWHM provides an estimate of the combination of all errors and if you get fewer errors with shorter subs, you get sharper images. It isn't misleading if you get better results.
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Yes I see your point, but it is also adding in the huge variable of mount accuracy which we all know is the massive one. So in that scenario the test would be more valid for a single mount compared to another with lower PE.
Certainly a case has been made which is convincing that short subs can give superb sharpness (your images Ray being the benchmark for that) but as a general rule for all setups and CCDs and types of images it may not be true.
Also some CCDs have large files. For example 16803 1x1 files are 32.4mb. So open 60 of those and you will get memory errors in CCDstack. They would also be very slow and tedious to process.
How large are the ICX674 images in 1x1 binning - about 4mb?
Greg.