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Old 12-10-2007, 10:57 AM
jase (Jason)
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Join Date: Sep 2006
Location: Melbourne, Victoria
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Quote:
Originally Posted by Alchemy View Post
given the chart then a 350d for deep sky would be 600-1000mm range.

so whats wrong with 1500mm as it seems to work ok,( im not trying to be difficult)
There is nothing stopping you from using the 350D at 1500mm. How optimal is the question. If we take the example of a C9.25 @ F/6.3 - it delivers 1480mm. Coupled to the 350D pixel size you get an arcsec/pixel combination of .90 arcsec/pixel.

Now ask yourself, how many nights a year will the seeing get below an average FWHM of 1 to take advantage of this arcsec/pixel combination?
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