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EOS R EF lenses reduce image resolution and aspect ratio

ttssingleton
Apprentice

I recently upgraded to an EOS R I purchased an adapter to use my EF lenses but whenever I use canon branded lenses my image quality is only 12 mp and the aspect ratio is 1.6 I cannot change it and it only happens with Canon branded lenses. Is there something I may be missing or doing wrong since I’m still learning this camera functions?

1 ACCEPTED SOLUTION

Tronhard
VIP
VIP

In anticipation of your reply that you have been using EF-S lenses, there is an issue with using those lenses, which are designed for an APS-C camera, as they behave on a Full-Frame one like your EOS R. 

In the DSLR platform you could not put those lenses on a FF body, as an EF-S lens projects too close to the sensor and fouls the mirror.  While there is no mirror on the EOS R, the image that is projected from an EF-S lens is still going to be the size of an APS-C sensor and thus will not use the whole area of the FF sensor.   This causes the area covered to be reduced from 30MP to just under 12MP, which is what you are experiencing.
See P610 in the Advanced User Guide and refer to the column under 1.6 crop for the values you are experiencing.

Tronhard_0-1707687256523.png

There is no work around this except to use EF or RF (not RF-S) lenses if you want to use the full area of the R sensor.


cheers, TREVOR

The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris

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If this resolves the issue, it might be a good idea to select the most appropriate response as a solution so others with the same issue will find it easily, and you will not get people continuing to send you redundant information.


cheers, TREVOR

The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
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