FF Lens on APS-C Camera Not as Sharp as APS-C Lens?

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Starny Contributing Member • Posts: 622
FF Lens on APS-C Camera Not as Sharp as APS-C Lens?

Since I cut-the-cable I've been watching some YouTube videos lately and this guy(s) comes up now and again.

Like perhaps a number of members here, I've been thinking that should I ever spend some real money on a lens it should be "future-proofed" by buying a FF with the thought that I might jump to an a7C-type camera at some point.

While it may be hard to compare shots taken with different cameras and lenses, this guy attempts to make a point that a FF lens on an APS-C camera may not be as sharp as a quality APS-C lens on an APS-C camera.

Is he right and who has a FF lens on their APS-C camera?

https://www.youtube.com/watch?v=S8-vfiq33R4

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Sony a6100 Sony E 16-50mm F3.5-5.6 PZ OSS Sony E 18-135mm F3.5-5.6 OSS
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