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Thread started 19 Jul 2014 (Saturday) 16:38
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Sensor sizes and their lenses

 
josh_r
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Jul 19, 2014 16:38 |  #1

This may be a dumb question.... I know the lenses specifically made for the APS-C censors on a full frame camera are severely vignetted due to the fact that the censor is larger than the area the lense covers. And vice versa, the FF lense on an APS-C is cropped quite a bit. I am curious if a micro four thirds lens on an APS-C camera of another make, like a Canon or Nikon, would have the same result as the above FF vs APS-C situation. From what I understand is the APS-C sensor is smaller in the micro four thirds cameras than a typical camera. I know they do not have the same lens mount and would never go together with a different camera unless the mount was switched... this is why I ask the question... I am debating switching the mounts.... Thanks for any advice.... If any of that makes sense above.




  
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pwm2
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Jul 19, 2014 16:44 |  #2

Look at:
http://en.wikipedia.or​g/wiki/Image_sensor_fo​rmat (external link)

There you can see that most other sensor formats are even smaller than APS-C. So lenses for these even smaller sensors can be made with even smaller image circle.

So a lens for micro four thirds would not be a good idea on an APS-C camera.


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archer1960
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Jul 19, 2014 17:23 |  #3

josh_r wrote in post #17042339 (external link)
This may be a dumb question.... I know the lenses specifically made for the APS-C censors on a full frame camera are severely vignetted due to the fact that the censor is larger than the area the lense covers. And vice versa, the FF lense on an APS-C is cropped quite a bit. I am curious if a micro four thirds lens on an APS-C camera of another make, like a Canon or Nikon, would have the same result as the above FF vs APS-C situation. From what I understand is the APS-C sensor is smaller in the micro four thirds cameras than a typical camera. I know they do not have the same lens mount and would never go together with a different camera unless the mount was switched... this is why I ask the question... I am debating switching the mounts.... Thanks for any advice.... If any of that makes sense above.

This is not necessarily true. For primes, it is probably true, but many zooms will only vignette at their wide end, while the longer end will often work fine.


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pwm2
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Jul 19, 2014 17:27 |  #4

archer1960 wrote in post #17042415 (external link)
This is not necessarily true. For primes, it is probably true, but many zooms will only vignette at their wide end, while the longer end will often work fine.

But then some of the APS-C lenses will reach too far into the camera and may touch a full-frame mirror. So while it's possible to modify Canon's 10-22 and use on a full-frame, the last part of the range must not be used or it can become quite expensive.


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archer1960
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Jul 19, 2014 18:21 |  #5

pwm2 wrote in post #17042421 (external link)
But then some of the APS-C lenses will reach too far into the camera and may touch a full-frame mirror. So while it's possible to modify Canon's 10-22 and use on a full-frame, the last part of the range must not be used or it can become quite expensive.

Only true for Canon's EF-S series. All the 3rd party "crop" lenses are safe to use on FF.


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pwm2
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Jul 19, 2014 18:23 |  #6

archer1960 wrote in post #17042512 (external link)
Only true for Canon's EF-S series. All the 3rd party "crop" lenses are safe to use on FF.

Covered by "But then some [...]"


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josh_r
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Jul 19, 2014 19:47 as a reply to  @ pwm2's post |  #7

I guess I should have been more clear. I was talking about prime lenses when I made my post. I do know that zoom lenses do not have the vignetting problem when zoomed in. This basically answers my question though. thanks everyone. I now know it is a bad idea.




  
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msowsun
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Jul 19, 2014 19:50 |  #8

archer1960 wrote in post #17042415 (external link)
This is not necessarily true. For primes, it is probably true, but many zooms will only vignette at their wide end, while the longer end will often work fine.

josh_r wrote in post #17042677 (external link)
I guess I should have been more clear. I was talking about prime lenses when I made my post. I do know that zoom lenses do not have the vignetting problem when zoomed in. This basically answers my question though. thanks everyone. I now know it is a bad idea.

I think it is more accurate to say "some" APS-C zoom lenses "may" be usable at longest vocal lengths. The only ones I have seen that are, are ultra-wide's like the Tokina 11-16, Canon 10-22, and Canon 10-18.

I have tried using the Canon 15-85 and 18-135, and Sigma 17-70 on FF, and they all vignette badly at all focal lengths.


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msowsun
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Jul 20, 2014 07:07 |  #9

Here is an example where the Sigma APS-C 50-150mm vignettes badly at ALL focal lengths on FF.

http://www.lenstip.com …DC_OS_HSM_Vigne​tting.html (external link)


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EverydayGetaway
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Jul 20, 2014 18:09 |  #10

josh_r wrote in post #17042677 (external link)
I guess I should have been more clear. I was talking about prime lenses when I made my post. I do know that zoom lenses do not have the vignetting problem when zoomed in. This basically answers my question though. thanks everyone. I now know it is a bad idea.

It's also impossible unless you're trying to adapt it to another mirrorless body. The flange distance of a m43 lens would make it impossible to adapt to a DSLR.


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archer1960
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Jul 20, 2014 18:58 |  #11

msowsun wrote in post #17042679 (external link)
I think it is more accurate to say "some" APS-C zoom lenses "may" be usable at longest vocal lengths. The only ones I have seen that are, are ultra-wide's like the Tokina 11-16, Canon 10-22, and Canon 10-18.

I have tried using the Canon 15-85 and 18-135, and Sigma 17-70 on FF, and they all vignette badly at all focal lengths.

Yup, the 11-16 works ok at 15-16, and my Tamron 18-270 works ok at the long end, though I don't remember just where that starts.


Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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