May 19, 2013, 05:59:02 PM

### Author Topic: 5D3 - AFMA similar to 5D2 or 1DX?  (Read 837 times)

#### dilbert

• 1D X
• Posts: 1776
##### 5D3 - AFMA similar to 5D2 or 1DX?
« on: August 17, 2012, 08:51:11 AM »
Does the AFMA in the 5D3 work in a similar fashion to that of the 5D2 (one setting per lens) or does it work like that of the 1DX where it is possible to have two settings for zoom lenses?

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##### 5D3 - AFMA similar to 5D2 or 1DX?
« on: August 17, 2012, 08:51:11 AM »

#### neuroanatomist

• 1D X
• Posts: 8599
##### Re: 5D3 - AFMA similar to 5D2 or 1DX?
« Reply #1 on: August 17, 2012, 08:58:08 AM »
The 5DIII is the same as the 1D X - separate wide and tele settings for zoom lenses, serial number recognition, etc.
EOS 1D X, EOS 7D, and lots of lenses
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#### Jamesy

• 6D
• Posts: 537
##### Re: 5D3 - AFMA similar to 5D2 or 1DX?
« Reply #2 on: August 17, 2012, 09:58:30 AM »
And I might add, the 5D3 (and I suspect the 1DX) will interpolate between wide and tele meaning if your wide is +2 and your tele is +4, midway through the focal range it will do +3.

#### neuroanatomist

• 1D X
• Posts: 8599
##### Re: 5D3 - AFMA similar to 5D2 or 1DX?
« Reply #3 on: August 17, 2012, 10:09:54 AM »
And I might add, the 5D3 (and I suspect the 1DX) will interpolate between wide and tele meaning if your wide is +2 and your tele is +4, midway through the focal range it will do +3.

Correct - a simple integer linear regression between the two values across the focal range of the lens.  For the plot below, each lens was set to W = -10 and T = +10.
EOS 1D X, EOS 7D, and lots of lenses
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#### Jamesy

• 6D
• Posts: 537
##### Re: 5D3 - AFMA similar to 5D2 or 1DX?
« Reply #4 on: August 17, 2012, 10:13:31 AM »
Correct - a simple integer linear regression between the two values across the focal range of the lens.  For the plot below, each lens was set to W = -10 and T = +10.
Is this a graph out of FoCal?

#### neuroanatomist

• 1D X
• Posts: 8599
##### Re: 5D3 - AFMA similar to 5D2 or 1DX?
« Reply #5 on: August 17, 2012, 10:24:01 AM »
Is this a graph out of FoCal?

No, I just plotted the data in Excel.
EOS 1D X, EOS 7D, and lots of lenses
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##### Re: 5D3 - AFMA similar to 5D2 or 1DX?
« Reply #5 on: August 17, 2012, 10:24:01 AM »