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Old 16-10-2006, 12:35 PM
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Striker (Tony)
Whats visual Astronomy

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Join Date: Dec 2004
Location: Brisbane
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How does "F" ratio affect imaging

Ok guys I dont think this has been aswered before as I am very interested to see what come's out of this.

For example if you have a SCT F10 and fit a Focal reducer how can this possibly decrease imaging time....wouldn't aperture be the defining point to how many photos hit the ccd.

I have spoken to a few people about this with varied replies.

If the focal reducer can decrease exposure time how does this provide more light to the chip.????..the light path distance is still the same as F10 but now has to futher travel through another lense such as a Focal reducer.

I dont know the answer thats why I am asking.

Thanks in advance
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