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View Full Version : Re: Lens Adapter - Crop Factor?



ectobuilder
07-29-2011, 12:21 AM
What additional crop factor does a lens adapter add to the NEX-FS100?

jetswing
07-29-2011, 12:59 AM
None.

legrevedotcom
07-29-2011, 02:22 AM
I might add, that I just got the Fotodiox one and attached the Canon 100mm macro and it works find imo. It fits very snuggly both in lens and camera mount. So if you can look past the dumb factor, then the price is nice.
Still waiting for the Kipon to arrive, just to test. But from what I've read, I'm not expecting much.

ectobuilder
07-29-2011, 08:27 AM
None.

Is it because of the short flange distance? With a Canon EF to E-Mount adapter, it seems as if the flange distance between the Canon lens and the NEX-FS100's mount is larger in distance than if the lens were natively on my Canon T3i. I guess there is some give for the distance in order to eliminate additional crop factor? I wonder how the math works?

Barry_Green
07-29-2011, 08:31 AM
The "crop factor" is only and solely determined by the size of the sensor, and by nothing else.

The adapter's depth is a factor in determining proper focusing.

Chris Johnston
07-29-2011, 09:52 AM
Just for my info, What IS the crop factor on this cam? 1.3?

Rick Burnett
07-29-2011, 09:59 AM
Is it because of the short flange distance? With a Canon EF to E-Mount adapter, it seems as if the flange distance between the Canon lens and the NEX-FS100's mount is larger in distance than if the lens were natively on my Canon T3i. I guess there is some give for the distance in order to eliminate additional crop factor? I wonder how the math works?

They should be the same (given the adapter is good) or the focus wouldn't work right. In my 7D, given the mirror assembly, the sensor is pretty far back. On my FS100, the sensor is REALLY close to the front.

Barry_Green
07-29-2011, 09:59 AM
Compared to a "full frame" camera, it's 1.53x.

Rick Burnett
07-29-2011, 10:00 AM
I thought it was 1.5

Barry_Green
07-29-2011, 10:07 AM
36/23.6 = 1.5254, or, rounded off, 1.53x.

Rick Burnett
07-29-2011, 10:10 AM
Haha, I didn't see your post when I wrote that, it was actually to the post before yours asking about it! :) Of course, I just rounded off one extra digit :)

jetswing
07-29-2011, 10:19 AM
I think it's safe to go by 1.5x :)