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paul wrote:
The light can be varied by a type of filtration affecting the sensitivity of the CCD. Depth of field is a consequence of the size of the hole (and hence area of lens) through which the light passes - so quite often varying the f-stop on digital cameras has no effect on depth of field.
bigalpha wrote:paul wrote:
The light can be varied by a type of filtration affecting the sensitivity of the CCD. Depth of field is a consequence of the size of the hole (and hence area of lens) through which the light passes - so quite often varying the f-stop on digital cameras has no effect on depth of field.
So, what you are saying, is that a lot of digital cameras don't actually have an aperture; that the sensitivity of the CCD just changes?
bigalpha wrote:Paul -
Is there a way to test this with a newer digital camera? My manual doesn't say anything about the aperture setting and DOF.
I'd like to see if my camera will actually give me a wider DOF, and not just filter the light.
paul wrote:Also many digital cameras so not actually use an iris to control the amount of light entering the camera as on film cameras (related to the f-stop).
<snip>
From the manual "Filter is applied to adjust the light entering the camera when the aperture is set to its minimum wit the COOLPIX 4300. Because of this, the minimum aperture setting may not yield wider depth of field as expected from the aperture value displayed in the monitor".
So I guess the same thing possibly also applies to some other compact digital cameras...
Teresa wrote:The lack of fast shutter speeds or a fast lens and the slow CCD is my one quibble with my digital camera. I've always had fast and good in low-light lenses in film cameras, but as yet, they are out of reach financially in digital.
NZcaver wrote:When the time came to get a new compact digital recently, I looked at the current Olympus models and came away disappointed. I researched several different brands, and even tested and returned a couple of models. I finally settled on a Canon A540, which I'm very impressed with. It has a fast startup time, a short shutter lag, and even manual aperture and shutter settings. However it's not my first choice for a caving camera, mainly due to the old flash/slave synchro issue mentioned earlier in this thread.
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