Quote:
Originally Posted by EricB
Thanks Ray. i was hoping someone would answer Stuart's question.
A quick (and probably silly). Focal ratio is easily calculated, but what about when a camera is rigged? How is the camera taken into account in the focal ratio calculation?
Cheers,
Eric
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The 2.5x powermate actually reduces slightly in magnification with an extension :
http://www.televue.com/engine/TV3b_p...id=53&Tab=_app