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Frequent Contributor
Posts: 113
Registered: ‎01-20-2016

example of 100-400 mk2

Hello

 

Thought you guys might like to see an example of the 100-400 mk2 in a test setting here you can see my sigma teleconverter just check out the depth of field at 100mm at F4.5 . To explain the setting this is the fire place ledge about an inch behind the converter is decrotive wall paper the depth of field is so extream you can not see the wall behind it. This is on a 600d so its really 160mm.$_57.JPG

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VIP
Posts: 10,382
Registered: ‎08-13-2015

Re: example of 100-400 mk2

Yes, it appears to be quite shallow, probably due to a relatively short distance between the camera and the subject. 

 

Do search on YouTube for " DotTune Focus  ".

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"Doctor told me to get out and walk, so I bought a Canon."
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VIP
Posts: 10,382
Registered: ‎08-13-2015

Re: example of 100-400 mk2

The Dot Tune method suggests that you calibrate and test focus at a distance of 50x the focal length. 

 

(50) x (100mm) x (1.6 crop factor) = 8000 mm

 

(8000 mm) x (1 inch/25.4mm) = 314.96063 inches

 

(314.96063 inches) x (1 foot/12 inches) = 25.24672 feet.

 

That calculation suggests that you need to be just over 25 feet away from a focus target.  There are many focus samples, both 2D and 3D, that you can download and print from the internet.  I think a flat, 2D poster is good to check front/back focus.  A 3D target made from folded cardboard, or photo paper, are best for testing, measuring, and calibrating Depth-Of-Field.

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"Doctor told me to get out and walk, so I bought a Canon."
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VIP
Posts: 13,026
Registered: ‎12-07-2012

Re: example of 100-400 mk2

".... you guys might like to see an example ..."

 

Was this a test?

EOS 1DX and 1D Mk IV and several lenses!
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Esteemed Contributor
Posts: 4,186
Registered: ‎02-17-2016

Re: example of 100-400 mk2

He is just confirming that his DOF calculator works. I don't see any other point.

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VIP
Posts: 10,382
Registered: ‎08-13-2015

Re: example of 100-400 mk2


@kvbarkley wrote:

He is just confirming that his DOF calculator works. I don't see any other point.


I hope not.  I don't see any calculations.  Do you?

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"Doctor told me to get out and walk, so I bought a Canon."
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Esteemed Contributor
Posts: 4,186
Registered: ‎02-17-2016

Re: example of 100-400 mk2

[ Edited ]

No, but he says "Check out the DOF at 100 mm and F4.5" like it is unexpected.

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Frequent Contributor
Posts: 113
Registered: ‎01-20-2016

Re: example of 100-400 mk2

well the DOF is not what i exspected I exspect this at 2.8 not 4.5

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Esteemed Contributor
Posts: 4,186
Registered: ‎02-17-2016

Re: example of 100-400 mk2

[ Edited ]

For the DOF calculator I use, for a FF camera at 100mm at F/4.5 at about 1m distance the DOF is .987 to 1.014 meters, or a total DOF of .027 m, which is pretty close to 1 inch.

 

Telephotos can really mess with your intuitive notions of depth of field

 

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VIP
Posts: 10,382
Registered: ‎08-13-2015

Re: example of 100-400 mk2


@paulbrogden10 wrote:

well the DOF is not what i exspected I exspect this at 2.8 not 4.5


The 600D is not listed for this online calculator.  Neither is my 6D.  So, these are ball park figures.   dofmasterDOTcom

 

Depth_Of_Field_Calculator_dofmasterDOTcom.PNG

 

I used what I thought to be the MFD, minimum focus distance.  Hope this helps.

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"Doctor told me to get out and walk, so I bought a Canon."
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