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Old Oct 12, 2003, 9:20 PM   #1
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Default narrow apertures

Hi folks. I'm new to this forum and digital photography. My question involves the narrowness of the aperture settings on some digital prosumers that I have reviewed. For example, the coolpix 5700 goes from an aperture of about f2 to about f10. Won't this severely limit the depth of field or am I missing something in regards to digital technology? My lenses for my film camera's go up to f22 and f32. Thanks for the info.

Mike
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Old Oct 12, 2003, 11:50 PM   #2
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See the following message where this has just been answered a couple of days ago:
http://www.stevesforums.com/phpBB2/v...ic.php?t=15211
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Old Oct 13, 2003, 12:26 AM   #3
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Default Re: narrow apertures

Quote:
Originally Posted by Dudjazz
My question involves the narrowness of the aperture settings on some digital prosumers that I have reviewed. For example, the coolpix 5700 goes from an aperture of about f2 to about f10. Won't this severely limit the depth of field or am I missing something in regards to digital technology? My lenses for my film camera's go up to f22 and f32.
No, it won't. In fact, the depth of field (DOF) derived from these "larger" apertures may be larger than those derived from "smaller" apertures obtained through a SLR lens. The key to the answer is that the image sensor size of a consumer digital camera is smaller than the film frame. Hence, for the same angle of view, the focal length needed by a consumer digital camera is much smaller than the focal length of a SLR lens required to achieve the same angle of view. For example, the 5700 has focal length range from 8.9mm to 71.2mm, which are equivalence to 35mm to 280mm in film format (in terms of angle of view). Consequently, given the same aperture, focusing distance, and the same angle of view, the lens that uses a shorter focal length has a larger depth of field than a lens that uses a longer focal length. See the "Depth of Field" page of my Coolpix 4500 user guide for the details.

CK
http://www.cs.mtu.edu/~shene/DigiCam
Nikon Coolpix 950/990/995/2500/4500 User Guide
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