Quote:
Originally Posted by mldee
I was also wondering if, since you don't really care if the thing is guiding on visible or IR, no filter might be a help in guiding.
BTW, does IR radiation show as visible on the image? I presume so, as the CCD just sees photons. A la Sony nightshot.
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Ir makes the star blobby (bigger).
Some people make the star a bit out of focus to make guiding better anyway, so without a filter it is bigger in the first place
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A filter just keeps the dust off the cmos/ccd and is only really required on a imaging camera (because ir makes stars blobby).
Hope this answers some questions.