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Occasional Contributor
Posts: 7
Registered: ‎03-26-2017

Canon mount dapter eos ef R vignettes

Canon RP camera with adapter.  Sigma 18-200 vignettes terribly so that picture is an oval surrounded by black.  If shooting at 200 it is fine, but anything less vignettes.  Same with Tamron.  Is this to be expected?  If so the adapter is useless...Thanks

Esteemed Contributor
Posts: 4,729
Registered: ‎02-17-2016

Re: Canon mount dapter eos ef R vignettes

Which Sigma 18-200? Is it the EF-S version?

 

Is it the Canon Adapter?

 

Note that all the adapter does is put the lens at the same physical location it would be on an EF/EF-S camera, so it should not vignette any more than the lens on an EF or EF-S camera.

Reputable Contributor
Posts: 601
Registered: ‎02-23-2020

Re: Canon mount dapter eos ef R vignettes

Sounds like your Sigma lens may be EF-S (designed to work with crop-sensor cameras).  But the RP is full frame so the lens' image circle isn't large enough to cover the entire sensor.

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Ricky

Photography: EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
Videography: EOS C70, RF 24-70 f/2.8L IS, Vixia HF G50
Occasional Contributor
Posts: 7
Registered: ‎03-26-2017

Re: Canon mount dapter eos ef R vignettes

It is the standard Canon adapter...Lens is Sigma DC 18-200 with Canon mount. Not sure if EF or EF S... Used with D80 and no problem...Vignette problem is 18-150

 

Have a Tamron SP 10-24 same problem.  Vignette from about 10-16.

 

Tamron 200-500 seems fine.

 

Canon ef 28-80 is also fine.

Reputable Contributor
Posts: 601
Registered: ‎02-23-2020

Re: Canon mount dapter eos ef R vignettes

A D80 is a crop-sensor camera.

 

No doubt, wide angle lenses as well as wide aperture lenses (e.g. EF 50mm f/1.2L) will vignette.  But as mentioned earlier, if you are using a lens on your full-frame camera that was desgined for a crop (smaller) sensor camera, that will really add to amount of vignetting.  And entire portions of the corner of the image may also now be completely black since not possible for any light to reach that area.

--
Ricky

Photography: EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
Videography: EOS C70, RF 24-70 f/2.8L IS, Vixia HF G50
Occasional Contributor
Posts: 7
Registered: ‎03-26-2017

Re: Canon mount dapter eos ef R vignettes

Disappointing that this has happened...read numerous reviews of the adapter and do not remember this being mentioned as a problem...

Reputable Contributor
Posts: 601
Registered: ‎02-23-2020

Re: Canon mount dapter eos ef R vignettes

It's not the adapter.  Please re-read the answers you got above.  Also, you'll want to find out if your lens is EF-S or not.  I suspect it is.  If so, that's the issue.

--
Ricky

Photography: EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
Videography: EOS C70, RF 24-70 f/2.8L IS, Vixia HF G50
VIP
Posts: 11,698
Registered: ‎08-13-2015

Re: Canon mount dapter eos ef R vignettes

[ Edited ]

@clifff27 wrote:

Disappointing that this has happened...read numerous reviews of the adapter and do not remember this being mentioned as a problem...


The problem is not the mount adapter.  It is the lenses.  Canon EF-S lenses cause the camera to automatically enter a crop mode.  Somehow the camera senses the EF-S lens through the adapter and it "adapts" itself into a crop mode.

 

C6BE0367-5F86-40AD-A592-85A9AE172BCF.jpeg

 

Apparently, this is not automatically taking place with your third party lenses.  The cause must be due to the fact that even though lens circle is for a crop sensor body, many third party lens manufacturers use only one lens mount for both full frame and APS-C lenses.  

 

Of course the one lens mount they tend ot use is for full frame lenses.  It works on both types of bodies.  I would speculate that the camera thinks there is a full frame lenses mounted to it, so it is notautomatically  going into crop mode.

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"Doctor told me to get out and walk, so I bought a Canon."
Occasional Contributor
Posts: 7
Registered: ‎03-26-2017

Re: Canon mount dapter eos ef R vignettes

thank you..all is well...just need to save for a full frame lens...

VIP
Posts: 13,998
Registered: ‎12-07-2012

Re: Canon mount dapter eos ef R vignettes

I believe the DC name is Sigma’s note for crop sensor cameras. DN is for mirrorless.
I can’t remember mounting a DC on my FF body so I don’t know if it will.
EB
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