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Why did I decide to test the notion that sensor size has a significant impact on depth of field? I performed this experiment to test my belief that that lens aperture and distance to subject are the two factors having the greatest impact on depth of field. ISO and shutter speed were kept constant for exposures made at the same focal length with both cameras. Tamron 24-70 f/2.8 Di VC USD: 50mm and 70mmĮach lens was used wide open at its smallest f-stop number.To create a large enough set of images to suitably address the question, each lens was used at a multiple focal lengths: The cameras were mounted to the tripod with the tripod in the same position for each set of exposures. The Tamron 24-70mm f/2.8 Di VC USD has no tripod collar or foot. The Nikkor 200-500mm f/5.6E and Tamron 70-200mm f/2.8 Di VC USD were mounted on a tripod in a fixed position. To isolate sensor size as the only variable, the comparison images were made with the lenses at the same focal length, focal ratio and at the same distance from a fixed position subject. These cameras were used with the following lenses: The cameras used were the full frame Nikon D610 and the DX format Nikon D90. In the below test images, you’ll see side-by-side comparisons of photos made with Nikon FX (full frame) and DX (crop sensor) camera bodies. The claim is that the DX sensor not only crops the angle of view but forces a significant increase in depth of field. In other words, the same lens at the same focal length will produce, not just a wider angle of view when paired with a full frame camera, but also a shallower depth of field. It is often said that a crop sensor camera will also produce an image having a greater depth of field. In the above image, the 200-500 is at 500mm but the angle of view matches that produced by a 750mm lens. As a result, photographs made with this camera will display an angle of view equivalent to that produced by a lens with 1.5x the actual focal length used.

In other words, the DX sensor crops the outer portion of the image formed by the lens. The D90 is a DX format camera having a 1.5x crop factor. For example, the above image was made with a Nikon D90 and a Nikkor 200-500mm f/5.6E telephoto zoom lens at 500mm.

It is well-known that a lens of a given focal length will deliver different angles of view when used with cameras having different sized sensors. It is commonly said that crop sensor cameras make images having both a narrower field of view and a greater depth of field.

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