Quote:
Originally Posted by thegableguy
The ED80 had a 0.85 flattener on it so it was essentially f/6.4. The reflector is f/5. This SHOULD mean that the newt would be significantly brighter, like two thirds of a stop... but it clearly isn't.
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It's more complicated that just point and shoot. There's varied opnions on what is myth and what is fact...
These might (or not might) help...
http://www.stanmooreastro.com/f_ratio_myth.htm
http://www.stark-labs.com/help/blog/...ioAperture.php