Sigma 35mm Crop vs. Full Frame | Baltimore Maryland Photographer

As folks may or may not know, I help moderate a photography forum over at  A question was recently posed on the forum over my review of the Sigma 35mm f/1.4 Art Lens; specifically the difference in performance of the lens on a crop sensor camera, vs. the performance on a full frame.

Without going into discussion on the differences between full-frame and crop sensors (take a look at Toby's video over on CAMERAREC for a great explanation) I figured the simplest way to discuss the differences in lens performance was to SHOW the difference with a simple image test.

Full-frame, 4.0 sec at f/8, ISO200, AWB

Crop Sensor, 3.2 sec at f/8, ISO200, AWB

Full-frame, 0.4 sec at f/2.5, ISO200, AWB

Crop sensor, 1/4 sec at f/2.5, ISO200, AWB

From a performance standpoint, it should be noted that the images were taken on a Canon 5D mkii (full-frame) and a Canon 7D (crop sensor).  There is little difference in shutter speed, white balance and noise, however many differences in images can be attributed to body as much as lens.  The biggest difference, from a lens standpoint, is in the amount cropped in the image.  In fact, a rough clipping of the image can be seen in the following photo...

As you can see, sensor size can make a HUGE difference.  Just something to think about when you're buying lenses.

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