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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 06 Mar 2014 (Thursday) 16:23
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DOF difference between the 85mm 1.2 and the 50mm 1.2

 
Nick_Reading.UK
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Mar 06, 2014 16:23 |  #1

Question.. If I am shooting with both lenses (I haven't got them yet ;-)a )
And I get exactly the same shot (let's say the ears are exactly in on the face with both cameras) which means I have to step back with the 85mm to get the exact shot..
My question is.. Because I have a greater distance to subject with the 85mm will my DOF be wider because I am further away?? I am thinking it must be.. Or am I incorrect ??


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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gonzogolf
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Mar 06, 2014 16:24 |  #2

http://www.dofmaster.c​om/dofjs.html (external link) Run your scenario here.




  
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Copidosoma
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Mar 06, 2014 16:29 as a reply to  @ gonzogolf's post |  #3

They will be the same.


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Nick_Reading.UK
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Mar 06, 2014 16:33 |  #4

gonzogolf wrote in post #16739631 (external link)
http://www.dofmaster.c​om/dofjs.html (external link) Run your scenario here.

The 85mm seems to have less DOF.. I am wondering why. Maybe I calculated incorrectly :o


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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Nick_Reading.UK
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Mar 06, 2014 16:34 |  #5

Copidosoma wrote in post #16739640 (external link)
They will be the same.

But the rule is the further away you are the greater the DOF increases.. Or not??


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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Nick_Reading.UK
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Mar 06, 2014 16:38 |  #6

gonzogolf wrote in post #16739631 (external link)
http://www.dofmaster.c​om/dofjs.html (external link) Run your scenario here.

I calculated the 50mm at 5metres and the 85mm at 8 metres and the 85mm has less DOF.. Wow!!!


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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gasrocks
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Mar 06, 2014 16:41 |  #7

Be honest with us and yourself, how often are you going to shoot either lens at 1.2?


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Nick_Reading.UK
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Mar 06, 2014 16:43 |  #8

gasrocks wrote in post #16739663 (external link)
Be honest with us and yourself, how often are you going to shoot either lens at 1.2?

I am trying to understand the concept of it, the same rules would apply to shooting at 1.8 or 2.2 with both lenses:)


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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sandpiper
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Mar 06, 2014 16:43 |  #9

Nick_Reading.UK wrote in post #16739650 (external link)
But the rule is the further away you are the greater the DOF increases.. Or not??

Yes, and the longer your focal length the more your DOF decreases. In general, if you are framing your subject the same, the extra DOF you get from moving further back is cancelled by the shallower DOF you get from using a longer lens, so the DOF remains more or less the same with no significant shift either way.




  
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Copidosoma
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Mar 06, 2014 16:44 |  #10

Nick_Reading.UK wrote in post #16739650 (external link)
But the rule is the further away you are the greater the DOF increases.. Or not??

With the same FL, yes, DOF increases with distance. Once you change the focal length it isn't so clear.

Careful with the DOF calculator (not only because of the assumptions on which it is based). You need to know the exact distance difference to get the same framing.

A quick look shows the 50mm with a FOV of 39.35 degrees, the 85 has 23.54 degrees. Proportion is 1.67. So assuming (not 100% sure this is correct) that the distance to subject with the same framing for the 85mm is 1.67x the distance for the 50mm, I get a DOF of 0.86 vs 0.83 (at 10ft and 16.7 feet). That would be a hard difference to demonstrate in an image.


Gear: 7DII | 6D | Fuji X100s |Sigma 24A, 50A, 150-600C |24-105L |Samyang 14 2.8|Tamron 90mm f2.8 |and some other stuff
http://www.shutterstoc​k.com/g/copidosoma (external link)
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sandpiper
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Mar 06, 2014 16:45 |  #11

gasrocks wrote in post #16739663 (external link)
Be honest with us and yourself, how often are you going to shoot either lens at 1.2?

That is irrelevant, they would still have the same DOF at f/8, f/16 whatever.




  
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Nick_Reading.UK
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Mar 06, 2014 16:47 |  #12

sandpiper wrote in post #16739667 (external link)
Yes, and the longer your focal length the more your DOF decreases. In general, if you are framing your subject the same, the extra DOF you get from moving further back is cancelled by the shallower DOF you get from using a longer lens, so the DOF remains more or less the same with no significant shift either way.

Nice one.. Cheers, I didn't know that !!!! Next time I am in Mathew street I will invite you for a beer :-)


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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TeamSpeed
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Mar 06, 2014 19:00 |  #13

This is something I put together a long time ago, maybe it would be helpful here?

IMAGE: http://teamspeed.smugmug.com/Electronics/Reference-Material/i-VDMSFhL/0/O/DOF_combinedset2.jpg

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Ladera
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Mar 06, 2014 22:56 |  #14

TeamSpeed wrote in post #16739963 (external link)
This is something I put together a long time ago, maybe it would be helpful here?

QUOTED IMAGE

This is great! Thanks.


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Nick_Reading.UK
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Mar 06, 2014 23:51 |  #15

Ladera wrote in post #16740385 (external link)
This is great! Thanks.

+ 1 bw!


EOS 5Dmk3 X2, 60D, EF24-70mm f2.8L mk2, EF70-200mm f2.8L IS mk2, EF85mm f1.8, EF50mm f1.4, EF50mm f1.8 mk1(350D with 18-55mm Sh"kit" lens).
Speedlite 600EX-RT, 430EX II Flash. manfrotto 190XDB tripod, Giottos GTMML 3290B Monopod, B+W 77mm 110 Single Coated filter, Hama 77mm Variable Neutral Density Filter.

  
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DOF difference between the 85mm 1.2 and the 50mm 1.2
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