 Deborah Liperote |
Digital cameras and Veiwing D.O.F. I have a canon powershot s60. It has some manual features. So here's my question. If I want to put my camera in aperture priority mode to capture decreased depth of field let's say f/2.8 and the cameras picks the correct shutter speed. Should I be able to view the blurred background right after I take the picture when I replay my picture on the camera screen or will it just show up on my computer that way? For anyone who has the canon eos 20d which I think I'm upgrading to, does it show you on the camera screen the decreased depth of field when you play back your picure. I guess I want to know if there is something wrong with my camera when I play back my picutures of if this is normal.
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David Earls |
The LCD screen on the 20D shows you the photo as you took it, i.e., with decreased depth of field when using a wide aperture. The 20D also has a DOF button so that you can preview the DOF of the photo before you take it. You have to have pretty good eyes to see the DOF at small apertures - the lens doesn't let much light in.
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robert G. Fately |
Deborah, DOF is a function of a number of factors. a) Aperture - all else being equal, wider (faster) setting yields shallower DOF b) focal length of lens - all else being equal, a wider angle lens will have more DOF that a photo taken from the same position with a longer lens c) image format size - all else being equal, a larger format of image capturing medium (film or chip) will have less DOF than a smaller one So let's add that up: Your Powershot is a P&S camera with a relatively small CCD, the 20D's chip is physically larger (even if it had the same number of megapixels; I'm referring here to the physical height and width of the CCD itself). This means that a given focal length of lens will elicit less DOF on the 20D. The Powershot also uses a wide angle kind of lens, again increasing DOF inherently. So even at f2.8 it will have more DOF than an equivalent lens on the 20D will at f2.8. In other words, you might not see the blurry background effect on the Powershot because it's hardly there. Regardless, DOF is pretty hard to tell (except in gross cases) on the LCD playback, even when you chimp on a DSLR. TO notice DOF requires a certain high resolution of the player, which simply isn't there on most of the tiny screens on the camera. So even with the 20D I wouldn't guarantee that you will see the effect easily on the LCD (I often don't on the D200 LCD, which is even bigger).
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Deborah Liperote |
Hey thanks to Bob and David. Your responses were helpful and appreciated
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