Crop Factor Dead Horse - not quite

11 months 3 weeks ago #753006 by MikeSD
Normally I'm not this confused. And in fact, I'm not confused about why crop factor occurs.

But something I read today confuses me.

Re: Canon R7 and RF-S  lenses

The RF-S lens is designed for APS-C sensors.  Similar to EF-S 

I read that the image circle of the RF-S lens is designed to fit the APS-C sensor.  That is, it fits the crop sensor, like the RF lens circle fits the full frame.

So if an RF lens fills the full frame perfectly and the RF-S fills the crop sensor perfectly, wouldn't that mean an RF-S on an R7 (crop body) wouldn't have any crop factor? There would be no lens circle outside the crop sensor like using an RF lens.

I've seen explanations for using an RF on a crop body. And using an RF-S on a full frame. But nothing about crop factor using an RF-S on a crop body.

Can someone answer this mystery


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