Plant Bugs (Two Photographs) And a Word on Aperture
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Cropped sensor cameras give you more depth of field than a full frame camera with the same aperture. The smaller the sensor the more depth of field you will get. For example, a Nikon DSLR with a 1.5 cropped sensor F4 is actually F6. The argument is made that because of this, bokeh and good out of focus backgrounds are harder to achieve with cropped sensors but that is not necessarily true. As long as the distance between you and your subject is less than the distance between your subject and the background, the largest aperture (e.g 2.8) will get you a good background. Increasing the distance between subject and background will only increase the lack of focus in the background and increase the possibility of bokeh. This is why cropped sensors might be better for close-up photography (more depth of field) and why they can still give you good backgrounds. FYI I only used cropped sensor DSLRs.