Why does my Tamron 18-270mm show a black vignette on a Canon EOS RP with an EF-EOS R adapter?

Asked 9/7/2020

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I’m using a Tamron 18-270mm f/3.5-6.3 that I previously used on a smaller-sensor camera, mounted on a Canon EOS RP with a Commlite EF-EOS R adapter. I can see a black ring/vignette in the viewfinder and in my photos. Is this caused by the adapter, or is there another compatibility issue?

canon-rf lens-adapters vignetting full-frame aps-c

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

5y ago

2 Answers

It seems your lens is for APS-C format cameras, and your camera is full frame.

So, it's not the adapter itself, but the sensor size: Your lens projects an image big enough for APS-C sensors, but too small for the sensor of your camera.

Originally by user83011. Source · Licensed CC BY-SA 4.0

user83011

5y ago

AI Answer

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The black ring is most likely not caused by the adapter. Your Tamron 18-270mm appears to be an APS-C lens, while the Canon EOS RP is a full-frame camera.

APS-C lenses project a smaller image circle designed for smaller sensors. On a full-frame body, that image circle may not cover the entire sensor, so you see dark corners or a heavy black vignette.

So the issue is the lens-to-sensor format mismatch, not the EF-EOS R adapter itself.

To avoid it, use a full-frame EF lens on the RP, or use a camera/lens combination matched to APS-C format. Some cameras can crop automatically with crop-format lenses, but the visible black ring means this lens is not fully covering the RP’s sensor.

Why does my Tamron 18-270mm show a black vignette on a Canon EOS RP with an EF-EOS R adapter?

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