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Fotodiox MD-EOS lens adapter
Dec 12, 2017 14:34:23   #
machia Loc: NJ
 
I’m considering this purchase so I can use my manual Rokkor lenses on my Canon crop sensor dslr . The Canon has a magnification factor of 1.6 X . The Fotiodoix specs shows a 1.4 X correction factor . What does this exactly mean ?
Will my lenses with the crop sensor and adapter have a magnification factor of 1.6 X + 1.4 X ?
Thank you in advance to anyone who has this adapter and can solve this bit of confusion on my part .
Thank you .

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Dec 12, 2017 15:03:08   #
Wasabi
 
I have the same question but in addition to the crop factor I think we must add the depth of the converter, mine is 25mm, to the focal length. Do we do the multiplication on the total length?

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Dec 12, 2017 15:24:54   #
rwilson1942 Loc: Houston, TX
 
As I understand it the 1.4X correction factor is to compensate for the flange offset caused by the adapter.
It has nothing to do with the camera crop factor.
The adapter adds ~25mm distance between the sensor and the lens flange.
That would cause the lens to be unable to focus at normal distances (out to infinity).
The 1.4X lens in the adapter corrects for that offset to allow the lens to focus to infinity.
As stated in the description, the glass is removable if you want to do macro.

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Dec 12, 2017 15:48:45   #
machia Loc: NJ
 
But is total magnification 1.6X + 1.4X ?

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Dec 12, 2017 16:07:13   #
rwilson1942 Loc: Houston, TX
 
machia wrote:
But is total magnification 1.6X + 1.4X ?


No. The camera crop factor has nothing to do with the 1.4X correction.

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Dec 12, 2017 17:05:09   #
machia Loc: NJ
 
rwilson1942 wrote:
No. The camera crop factor has nothing to do with the 1.4X correction.

Thank you .

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Dec 13, 2017 10:54:14   #
agillot
 
i try using this device on a nik d 300 it work ok , but , in outdoor pictures in bright sunlight at time i ended uo with a donut shape halo in center of picture .using various pentax lenses .that is with sun behind me .so , you may or may not have that issue .

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Dec 13, 2017 10:57:00   #
agillot
 
reading you question a second time , i am not aware of that 1.4 crop issue of the adaptor , mine has a lens in it .

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Dec 13, 2017 11:00:26   #
rwilson1942 Loc: Houston, TX
 
agillot wrote:
reading you question a second time , i am not aware of that 1.4 crop issue of the adaptor , mine has a lens in it .


The 1.4X is not a crop factor.
It is the correction the lens in the adapter does to adjust for the flange offset caused by the adapter.

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Dec 13, 2017 19:17:10   #
imagemeister Loc: mid east Florida
 
rwilson1942 wrote:
The 1.4X is not a crop factor.
It is the correction the lens in the adapter does to adjust for the flange offset caused by the adapter.


It is a built in 1.4X tele-extender ...to compensate the differing flange distance and allow infinity focus.

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