[thegableguy (Chris)]

Originally Posted by OICURMT

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

Fantastic article, thank you!! Answered all my questions. I had the exact same impressions & experience; he actually went into the maths behind it and explained exactly why that's the case. It seems that reflectors are indeed significantly less efficient than refractors. I never realised by how much. 14% of the light is lost in each reflection! They sure don't advertise that fact on the boxes they come in...

Thanks again for posting, much appreciated.