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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 05 Jul 2014 (Saturday) 13:28
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Newbie question

 
JCNODINE
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Jul 05, 2014 13:28 |  #1

Just up graded from a T4I to a 6d, I work on the outside so a lot of opportunity My 24 to 105 is great for a walk around lens and the only other I have presently is a Tamron 18 270
cant afford another right now . the Tamron does ok except that on the 6d body it takes pictures that look like your looking through a hole . Corners rounded off and blacked out other than that the pics are ok. what gives with the corners . When I use the 2x multiplier they go away BUT THE GRAINIES set in. YES I TRIED TO LOOK IT UP BUT COULDNT FIND ANYTHING.;)




  
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DwainRowe
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Jul 05, 2014 13:34 |  #2

JCNODINE wrote in post #17013101 (external link)
Just up graded from a T4I to a 6d, I work on the outside so a lot of opportunity My 24 to 105 is great for a walk around lens and the only other I have presently is a Tamron 18 270
cant afford another right now . the Tamron does ok except that on the 6d body it takes pictures that look like your looking through a hole . Corners rounded off and blacked out other than that the pics are ok. what gives with the corners . When I use the 2x multiplier they go away BUT THE GRAINIES set in. YES I TRIED TO LOOK IT UP BUT COULDNT FIND ANYTHING.;)

Apparently your Tamron is an EF-S equivalent lens (crop frame) which throws a much smaller image circle than the lenses that should be used on the 6D (EF or equivalent).

The smaller image circle does not cover the entire sensor, thus the black corners.

Dwain


6D | EF 17-40 f/4 L | EF 70-200 f/4 L IS | EF 50mm f1.4 USM -|- Rebel T2i | EF-S 17-55 IS | Σ 10-20 f3.5 EX DC | Σ 70-300 4-5.6 DG Macro (Yes, I am cheap) | Speedlite 580EXII | YN622c
EOS M | EFM 22 f/2

  
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MissFire
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Jul 05, 2014 13:35 |  #3

The Tamron is made specifically for APS-C cameras. The 6d is a FF camera. Hope this explains your situation.:)


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DC ­ Fan
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Jul 05, 2014 13:37 |  #4

JCNODINE wrote in post #17013101 (external link)
Just up graded from a T4I to a 6d, I work on the outside so a lot of opportunity My 24 to 105 is great for a walk around lens and the only other I have presently is a Tamron 18 270
cant afford another right now . the Tamron does ok except that on the 6d body it takes pictures that look like your looking through a hole . Corners rounded off and blacked out other than that the pics are ok. what gives with the corners . When I use the 2x multiplier they go away BUT THE GRAINIES set in. YES I TRIED TO LOOK IT UP BUT COULDNT FIND ANYTHING.;)

The Tamron 18-270mm lens is designed for cameras with so-called "crop" sensors. The Canon 6D is a so-called "full frame" camera. The 18-270 covers what's called a reduced image circle. Unfortunately, you got the wrong lens for the 6D.




  
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John ­ from ­ PA
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Jul 05, 2014 13:39 |  #5

I looked up the lens and Dwain and MissFire are correct in that the Tamron lens is designed only for the APS-C sensor, which is what your T4i had. Actually you are lucky damage didn't occur. With some lenses designed for APS-C the camera mirror of a full frame body will hit the back of the lens and damage the mirror and maybe the lens. I suggest you use extreme caution in testing lenses moving forward. There is generally no second chance; one simple shutter click can damage the mirror and/or lens. The 18-55mm EF-S kit lens commonly sold with the T4i should not be used with a 6D.




  
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DwainRowe
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Jul 05, 2014 13:46 |  #6

As far as I know, Tamron and Sigma lenses designed for APS-C cameras ("crop sensors") are safe to use on "full frame" Canon cameras as the rear element does not extend rearward into the mirror box.

HOWEVER, Canon lenses designed for APS-C may, resulting in a damaged mirror assembly. That's why Canon EF-S lenses are designed and manufactured with a "guard" which prevents them from being mounted on Canon FF cameras.

But, please do not use APS-C lenses (or other lenses not specifically designed for EF compatible only cameras) on my say-so. I'm just a random dude on the internet.

Dwain


6D | EF 17-40 f/4 L | EF 70-200 f/4 L IS | EF 50mm f1.4 USM -|- Rebel T2i | EF-S 17-55 IS | Σ 10-20 f3.5 EX DC | Σ 70-300 4-5.6 DG Macro (Yes, I am cheap) | Speedlite 580EXII | YN622c
EOS M | EFM 22 f/2

  
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sandpiper
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Jul 05, 2014 13:57 |  #7

John from PA wrote in post #17013116 (external link)
With some lenses designed for APS-C the camera mirror of a full frame body will hit the back of the lens and damage the mirror and maybe the lens. I suggest you use extreme caution in testing lenses moving forward. There is generally no second chance; one simple shutter click can damage the mirror and/or lens. The 18-55mm EF-S kit lens commonly sold with the T4i should not be used with a 6D.

The damage is only possible with some Canon EF-S lenses as their design allows for the rear to protrude further into the mirror box, usually at the short end of a zoom. That is why they specifically designed the different EF-S mount, so that such lenses cannot be fitted to FF cameras by mistake.

Third party manufacturers, such as Tamron and Sigma, do not use such a short back focus design and so their APS-C only lenses do not protrude far enough back to risk hitting the mirror. So, they have used the EF mount as it is safe to do so. The only problem is the extreme vignetting from the small image dircle.

The reason for the vignetting is obvious, less so is why "the grainies" set in with a 2x converter. Using a TC in itself shouldn't cause any noise or grain (I am assuming the OP is referring to getting a noisier image) however as it knocks two stops off the maximum aperture, the camera (if it is on auto ISO) is possibly bumping the ISO to a higher level, which may be causing noise (although the 6D is so good at noise control, I would imagine that it should be able to shoot two stops higher ISO than a T4i without significantly more obvious noise).




  
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runninmann
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Jul 05, 2014 13:58 |  #8

Dwain is correct. Sigma, Tamron and Tokina lenses designed for Canon APS-C bodies are EF mount and do not pose the danger of mirror damage as Canon EF-S lenses. However, as you have found, they will vignette.

Sigma's designation for APS-C lenses is "DC"; Tokina's is "DX" and Tamron's is "Di-II." If you use any of these on your 6D, you will most likely get some degree of vignetting at certain focal lengths and apertures.


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John ­ from ­ PA
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Jul 05, 2014 14:19 |  #9

I was incorrect in making the statement that "the 18-55mm EF-S kit lens commonly sold with the T4i should not be used with a 6D." The reality is it can't be used since the mount is designed in such a way that it won't even mount. I do feel however that even though virtually all 3rd party APS-C lenses will mount and probably not damage the mirror, it is best not to use these lenses without being informed, and since the OP asked, he likely wasn't informed, but certainly is now!




  
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DwainRowe
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Jul 05, 2014 14:45 |  #10

John from PA wrote in post #17013181 (external link)
I was incorrect in making the statement that "the 18-55mm EF-S kit lens commonly sold with the T4i should not be used with a 6D." The reality is it can't be used since the mount is designed in such a way that it won't even mount. I do feel however that even though virtually all 3rd party APS-C lenses will mount and probably not damage the mirror, it is best not to use these lenses without being informed, and since the OP asked, he likely wasn't informed, but certainly is now!

Agreed.


6D | EF 17-40 f/4 L | EF 70-200 f/4 L IS | EF 50mm f1.4 USM -|- Rebel T2i | EF-S 17-55 IS | Σ 10-20 f3.5 EX DC | Σ 70-300 4-5.6 DG Macro (Yes, I am cheap) | Speedlite 580EXII | YN622c
EOS M | EFM 22 f/2

  
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JCNODINE
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Jul 05, 2014 20:41 |  #11

Thanks to all who answered its as suspected . I did look at the backs VERY carefully and considered it non lethal. Well on to the next question anyone got a 100-400 cannon they want to sell for a hunnert bucks :) IT sucks to be hindered by such things as Money. HEY! maybe ill just print some like Obama does




  
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bumpintheroad
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Jul 05, 2014 22:18 |  #12

You could sell your 17-270 and throw in another $100 to get a Tamron 70-300. Probably won't need to even throw in the full $100.


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runninmann
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Jul 06, 2014 04:22 |  #13

JCNODINE wrote in post #17013694 (external link)
Thanks to all who answered its as suspected . I did look at the backs VERY carefully and considered it non lethal. Well on to the next question anyone got a 100-400 cannon they want to sell for a hunnert bucks :) IT sucks to be hindered by such things as Money. HEY! maybe ill just print some like Obama does

I'm not sure this fits the bill, but the mods frown on political discussions.
https://photography-on-the.net/forum/showthre​ad.php?t=50442


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delta0014
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Jul 06, 2014 04:48 |  #14

Please don't ruin this forum by throwing your own political beliefs into it. That's why Fox and MSNBC exist.


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WaltA
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Jul 06, 2014 11:07 |  #15

JCNODINE wrote in post #17013694 (external link)
Thanks to all who answered its as suspected . I did look at the backs VERY carefully and considered it non lethal. Well on to the next question anyone got a 100-400 cannon they want to sell for a hunnert bucks :) IT sucks to be hindered by such things as Money. HEY! maybe ill just print some like Obama does

To get a wider response the place for this post would be here


Walt
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