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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 30 Dec 2012 (Sunday) 03:19
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FoCal Aperture Sharpness test with 85L

 
cdang
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Dec 30, 2012 03:19 |  #1

So I ran my 85L through Reikan Focal aperture sharpness test today. Now the 85L is suppose to be sharp wide open and I think most of us can agree to that. Now my sharpest aperture is F5.6 and F6.3 at around 2070 ish but from f2 it becomes a steep decline with F1.2 being around 1750.

Has anyone run this test on the 85L and has had similar results ? Just being curious ;)




  
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convergent
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Dec 30, 2012 07:56 |  #2

I've only run that test on the 24-70 II and it was pretty flat wide open.


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pulsar123
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Dec 30, 2012 10:46 |  #3

According to this (external link), the center sharpness of 85L should be highest at f4, and decline noticeably by f1.2. So it looks pretty normal to me.


6D, Tamron 24-70 f2.8 VC, 135L, 70-200 f4L, Laowa 15mm 1:1 macro, 50mm f1.8 STM, Samyang 8mm fisheye, home studio

  
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Kolor-Pikker
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Dec 30, 2012 10:53 |  #4

According to this (external link) from SLRgear, the above conclusions are generally right from a technical standpoint; the lens is fairly bad from f/1.2-f/2 and gets good at f/4.

Of course, in practice, f/2 looks as razor sharp as you could possibly want for portraiture, and even f/1.6 is pretty good. At f/1.2 not enough is in focus for sharpness to even matter in the first place.

Tested numbers, in the case of the 85L, have little to do with how the lens is used.


5DmkII | 24-70 f/2.8L II | Pentax 645Z | 55/2.8 SDM | 120/4 Macro | 150/2.8 IF
I acquired an expensive camera so I can hang out in forums, annoy wedding photographers during formals and look down on P&S users... all the while telling people it's the photographer, not the camera.

  
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drzenitram
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Dec 30, 2012 12:44 |  #5

It could be that your lens is in need of a little MFA adjustment. Maybe the stopped down aperture is bringing the target into focus, rather than just improving the quality of image by stopping down. I've heard that the 85L is a tiny bit sharper than my sigma 85, and my sigma 85 is very sharp at f1.4.


| Bodies - 5D Mark II, T2i | Lenses - Helios 44-2, Sigma 35mm 1.4, Sigma 85 1.4, Sigma 70-200 2.8 OS, Tamron SP AF 1.4x TC | Lights - 430ex ii x2, Random 3rd party strobes

  
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FoCal Aperture Sharpness test with 85L
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