Can APS-C lenses cover a full-frame Canon RF sensor when used with an EF/EF-S adapter?
Asked 10/21/2020
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If you mount a Canon EF-S or other APS-C DSLR lens on a full-frame Canon RF mirrorless body using the EF/EF-S to RF adapter, does the adapter increase the image circle or change focus in a way that helps the lens cover the full sensor? Or does the lens still only project an APS-C image circle, causing vignetting or forcing crop mode? Are there any known EF-S lenses that can cover full frame, at least over part of their zoom range?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
5y ago
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The EF-S to RF adapter is only possible because of the very short Flange focal distance of 20mm of the RF mount compared to the 44mm of the EF and EF-S mounts.
The adapter places the EF-S mount lens at it’s native 44mm distance from the sensor, so the image is no larger, and there will still be severe vignetting with most crop lenses.
Canon RF mount cameras will automatically crop the image from a Canon EF-S lens, while Third party lenses do not.
There are some EF-S Ultra-Wide zoom lenses that will give full frame coverage. The EF-S 10-18mm STM can give full frame coverage, but only at 14-18mm. The EF-S 10-22mm USM works at 14-22mm. I am not aware of any other Canon lenses that will give full coverage, but some Third party APS-C Ultra-Wide angle lenses also work.
When using a third party APS-S lens like Sigma, Tamron, or Tokina, it is possible to select a 1.6x manual crop mode with RF cameras.
With EF-S lenses, [1.6x (crop)] is set automatically, and no other option is available.
Originally by user39427. Source · Licensed CC BY-SA 4.0
user39427
5y ago
0
Generated from our catalog & community — verify before relying on it.
No. The EF/EF-S-to-RF adapter does not make the image circle larger. Its job is to place the lens at the same flange distance it would have on an EF/EF-S DSLR, so focus behavior stays normal, including infinity focus.
That means an APS-C lens still projects essentially an APS-C image circle on a full-frame RF camera. In most cases, you’ll get heavy vignetting unless the camera crops the image. Canon RF bodies automatically crop when they recognize a Canon EF-S lens; some third-party APS-C lenses may not trigger that automatically.
A few APS-C ultra-wide zooms can cover full frame over part of their range. From the answers provided:
- Canon EF-S 10-18mm STM: usable on full frame roughly from 14-18mm
- Canon EF-S 10-22mm USM: usable roughly from 14-22mm
Coverage varies by lens and focal length, so there isn’t a universal rule. In general, expect crop mode or strong corner darkening, with only a few exceptions offering partial full-frame coverage.
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