Ephotozine Review: Z 100-400/4.5-5.6 S VR

Started Jan 25, 2022 | Discussions thread
anotherMike Forum Pro • Posts: 10,792
Re: Ephotozine Beware - Poor testing protocols…
1

Optical bench MTF is a measure of contrast at various resolution frequencies, and is FAR more useful than MTF50. It is usually done at infinity, which of course benefits landscape shooters.

Also, the optical design of lenses is often so that performance is intentionally different for different distances, and this has nothing to do with dual focus motors.

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