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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Mar 2012 (Thursday) 13:53
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samyang 14mm hyperfocal question

 
macky112
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Mar 29, 2012 13:53 |  #1

Hi All,

playing with DoF calculators, I learned 14mm f/5.6 has hyperfocal at 1.2m (so 60cm to infinity will be "in focus")

does "in focus" means "really sharp"?

is it possible that even tho 60cm to infinity is "in focus" only a smaller range within that "in focus" range will be "really sharp" (when pixel peeping)?

the Samyang 14mm is a very sharp lens, but I find it's DoF a lot thinner than what the DoF calculator suggests. using f/5.6 and focusing at 1.2m, when pixel peeping, i was only able to get about 1m to 5m to be "really sharp", and it gets softer further away from that range.

comments/advices appreciated

Regards,
Michael


Cameras: 5D III x2, 6D x2
Lenses: 14/2.8, Σ 35/1.4, 50/1.4, Σ 85/1.4, 17-40 L, 24-70/2.8 II L, 70-200/4 IS L, 70-200/2.8 IS II L
Flashes: 580EX II x3 :: Triggers: YN-622 x4

  
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macky112
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Mar 29, 2012 14:11 |  #2

ok, i am reading a DPreview discussion saying that the 0.03mm circle of confusion used in 5d2 dof calculation is too big, and should instead use 0.007mm (43mm sensor diag / 6745 pixels along sensor diagonal <--- i dont know how they come up with that?)

with that said, i am getting following numbers:

14mm, f/5.6, coc 0.007mm, hyperfocal distance 5m, DoF 3.31m to infinity

which is closer to what I am observing (via pixel peeping)

anyone can comment/advise?


Cameras: 5D III x2, 6D x2
Lenses: 14/2.8, Σ 35/1.4, 50/1.4, Σ 85/1.4, 17-40 L, 24-70/2.8 II L, 70-200/4 IS L, 70-200/2.8 IS II L
Flashes: 580EX II x3 :: Triggers: YN-622 x4

  
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wunhang
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Mar 29, 2012 14:16 |  #3

The depth of field really is a gradual loss of sharpness.

This is usually my go-to site for the more technical side of photography:
http://www.cambridgein​colour.com/tutorials/d​epth-of-field.htm (external link)


Canon 5D IV | Canon 5D II | XSI (Infrared modified) | SL1 | 16-35mm L f/4.0 IS | 24-70mm L f/2.8 II | 40mm f/2.8 | 85mm f/1.8 | 70-200mm L f/4.0 IS | Rokinon 14mm f/2.8 | C/Y 28mm f/2.8 | Tamron 35mm f/1.8 VC | C/Y 50mm f/1.7 | Zeiss 100mm MP
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pulsar123
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Mar 29, 2012 14:43 |  #4

macky112 wrote in post #14175912 (external link)
ok, i am reading a DPreview discussion saying that the 0.03mm circle of confusion used in 5d2 dof calculation is too big, and should instead use 0.007mm (43mm sensor diag / 6745 pixels along sensor diagonal <--- i dont know how they come up with that?)

with that said, i am getting following numbers:

14mm, f/5.6, coc 0.007mm, hyperfocal distance 5m, DoF 3.31m to infinity

which is closer to what I am observing (via pixel peeping)

anyone can comment/advise?

Correct. In exactly the same way I compiled a small table of hyperfocal distances for Samyang 8mm, for pixel-peepers (using pixel size of my Canon 50D - coc=0.005 mm):

https://photography-on-the.net …?p=14084901&pos​tcount=494


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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macky112
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Mar 29, 2012 15:44 |  #5

pulsar123 wrote in post #14176141 (external link)
Correct. In exactly the same way I compiled a small table of hyperfocal distances for Samyang 8mm, for pixel-peepers (using pixel size of my Canon 50D - coc=0.005 mm):

https://photography-on-the.net …?p=14084901&pos​tcount=494

Hi Pulsar123, thank yo for the feedback. quick question, what we calculated (and assumed to be) CoC, is that just pixel size (or perhaps, pixel-to-pixel size)? can we safely assume that is actually CoC?


Cameras: 5D III x2, 6D x2
Lenses: 14/2.8, Σ 35/1.4, 50/1.4, Σ 85/1.4, 17-40 L, 24-70/2.8 II L, 70-200/4 IS L, 70-200/2.8 IS II L
Flashes: 580EX II x3 :: Triggers: YN-622 x4

  
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macky112
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Mar 29, 2012 15:50 as a reply to  @ macky112's post |  #6

inspired by Pulsar123's table, here are my calculations for the Samyang 14mm, using DoFmaster.com

14mm, CoC: 0.007mm (for 5d2)

f/2.8, hyperfocal: 9.91m (in focus, 4.96m - infinity)
f/4, hyperfocal: 7.01m (in focus, 3.51m - infinity)
f/5.6, hyperfocal: 4.96m (in focus, 2.48m - infinity)
f/8, hyperfocal: 3.51m (in focus, 1.76m - infinity)
f/11, hyperfocal: 2.49m (in focus, 1.24m - infinity)
f/16, hyperfocal: 1.76m (in focus, 0.88m - infinity)


Cameras: 5D III x2, 6D x2
Lenses: 14/2.8, Σ 35/1.4, 50/1.4, Σ 85/1.4, 17-40 L, 24-70/2.8 II L, 70-200/4 IS L, 70-200/2.8 IS II L
Flashes: 580EX II x3 :: Triggers: YN-622 x4

  
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Mookalafalas
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Mar 29, 2012 17:59 |  #7

It seems like we've seen postings like this in the thread before that gave much more...generous numbers. I'm not sure what "infinity" actually means, but when I set my distance at 1.2M or so at 5.6, the tops of distant buildings and clouds look sharp. Also, this is probably based on film cameras? F16 no doubt has theoretically greater sharpness, but doesn't diffraction eat that up?


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Wilt
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Mar 29, 2012 20:58 |  #8

  • Most DOF calculators assume the 'manufacturer standard' for CofC size, but that size is too large and represents what someone with 20/20 vision will actually perceived as Out of Focus. Using 20/20 vision as the human visual acuity, the CofC size should be considerably smaller than 'manufacturer standard'!
  • DOF calculators normally assume 8x10" print (about 8.5x magnification of original FF image) viewed from about 25cm away, but when you pixel peep the 5DII images on the computer monitor at 100%, you are actually viewing as if you were looking at a 45x magnification! So DOF in that high magnification situation is far less that it would be on 8x10 print.


Using 20/20 vision, and assuming 8x10 print, the Hyperfocal distance for 14mm lens at f/4 would be 7.357m, and items at 3.682m would be percieved to be 'in focus' (the CofC is still a small enough blur disk to fool the brain into thinking 'sharp point') and items as far as 3770m would also be percieved as 'in focus'.

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macky112
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Mar 29, 2012 22:22 as a reply to  @ Wilt's post |  #9

Thank you Wilt for explaining the details.


Cameras: 5D III x2, 6D x2
Lenses: 14/2.8, Σ 35/1.4, 50/1.4, Σ 85/1.4, 17-40 L, 24-70/2.8 II L, 70-200/4 IS L, 70-200/2.8 IS II L
Flashes: 580EX II x3 :: Triggers: YN-622 x4

  
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Mookalafalas
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Mar 30, 2012 01:20 |  #10

These numbers seem very different at this site.
http://www.dofmaster.c​om/dofjs.html (external link)

If I put in that I am shooting with a 5D2, and set focus distance at 7ft, it claims everything from 2.45Ft to infinity will be in focus. A pretty good range, IMO!


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You don’t have to have a great lens to take great pictures—but it sure helps. –Ben Long

  
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samyang 14mm hyperfocal question
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