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Full Version: Next OL lens test report - Canon RF 100-500mm f/4.5-7.1 USM L IS
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(12-10-2020, 01:32 PM)Klaus Wrote: [ -> ]https://www.opticallimits.com/canon_eos_...00500f4571

Nice comprehensive review ...... always a pity about F7.1 though .....

"nothing beats a long focal length but a longer one"

  nothing beats a long focal length better than a longer one !!

  "weather resistance"
Then again it was reported to fall to f/7.1 pretty late in the zoom range, certainly after 400mm. Lots of people probably started setting their cameras to 1/2 stop exposure steps because it reports f/5.6 at 400mm if set up this way (f/6.3 if set to 1/3 stop intervals). Smile In reality it's prolly something like f/6.1 at 400mm, so not quite rounds down to f/6.7.

That was pretty surprising though, since I used to expect it to turn f/7.1 at about 320~350mm tops.
(12-10-2020, 08:03 PM)Rover Wrote: [ -> ]That was pretty surprising though, since I used to expect it to turn f/7.1 at about 320~350mm tops.

Then they would have to construct the lens in a way that the aperture (size) enlarged from 320 to 500mm to stay at f7.1 (so a fixed max aperture (f-stop) over that whole range. That would be a bit odd..
Don't most of the variable aperture zooms hit the smallest of the aperture range rather earlier than the max. focal length, like - say - the Sony 100-400mm f/4.5-5.6 GM becoming an f/5.6 lens by 162mm (as reported by Bryan of TDP in his review)? Smile I know the Canon 100-400 II was a positive example though, only going to f/5.6 after 312mm, but it's a rare case.