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Canon EOS Full Frame for HD
All about using the Canon 1D X, 6D, 5D Mk. IV / Mk. III / Mk. II D-SLR for 4K and HD video recording.


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Old November 18th, 2009, 12:15 AM   #16
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Join Date: Jan 2007
Location: Portland, OR
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Quote:
Originally Posted by Jon Fairhurst View Post
I could throw a switch and turn my 200L into the equivalent of a 600mm f/2.8
Actually, it would turn your 200mm f/2.8 into the equivalent of a 600mm f/8.4. The intensity of light per area is still f/2.8, of course, but with 9 times less area, the total amount of light is 9 times less (3 stops). Furthermore, the noise will be three stops worse (like ISO 12800 instead of ISO 1600, even when ISO is kept the same). Also DOF and diffraction will be like a 600mm f/8.4 lens. I did a thread that covered this recently.
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