TECH SUPPORT Depth Bomb Q. My Fujifilm FinePix S4500 has some amazing capabilities, but when I set it to program mode and tried to dial in more aperture options, I found I could only get one or two. (I could get f/11 with some contortions.) According to the fine print in the manual, the aperture is controlled to some degree by neutral-density filters, not by actually changing the lens opening. Doesn’t this limit our ability to control depth of field? A. It certainly does. But what it really limits is the ability to set shallow depth of field. As we discussed in our April 2012 Tech Talk, the small sensors in compact cameras provide vast—often too vast—DOF. The maximum f/3.1 aperture of your S4500 is the full-frame equivalent of f/18 in terms of DOF at any given subject magnification; f/5.6 will give you the DOF of about f/32. Apertures in cameras of this type are so small that a true f/11 would essentially be a pinhole, and the resulting diffraction would seriously degrade images. |
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