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R7 and RF 600 f11

Started 5 months ago | Discussions thread
John Sheehy Forum Pro • Posts: 26,688
Re: R7 and RF 600 f11

Avenger20 wrote:

Nice pictures, but I think the RF 600mm f11 might be too much for a 30mpix APS-C (and the f11 too slow for the AF of this camera). So I was thinking about getting the RF 100-400mm f5.6-8. Is the performance and picture quality good on a R7?

None of the OP's main complaints will be improved with a shorter, slightly-faster lens, with no larger entrance pupil.

The point of the RF600/11 (besides price) is low weight for high magnification.  The RF100-400 will only be more flexible, allowing one to shoot closer and larger subjects, or more room to track an active subject in the frame.  Those certainly have value, and AF may be a little faster with the zoom if one doesn't add the RF1.4x.  When one is focal-length-limited, however, and one doesn't need to stop down past f/11, the RF600/11 should be expected to give slightly better subject quality.

The RF600/11 has a very slightly larger entrance pupil, and should get slightly more total light from the subject, and slightly higher background blur, and slightly less diffraction, and maybe even less lens aberration, with the prime design.

400/8 = 50mm pupil diameter.

600/11 = 53mm pupil diameter.

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Beware of correct answers to wrong questions.
John
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