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#1
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F-stop range
Gisle Hannemyr wrote:
me@ invalid writes: Why do some these cameras only stop down to f-8? Refraction limits how much the lens can be stopped down before image quality deteriorates. If a camera has a very small sensor, this limit can be at f/8. Diffraction. David |
#2
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me@ invalid wrote in message
... Why do some these cameras only stop down to f-8? Diffraction "limiting: is a function of the absolute size of the aperture. With a short lens, diffraction may begin to deteriorate the image by f/8. I'd rather have the option to go into the diffraction limited region myself, but the manufacturers seem to think they are smarter than us. Austin |
#3
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"AustinMN" wrote in message ... me@ invalid wrote in message ... Why do some these cameras only stop down to f-8? Diffraction "limiting: is a function of the absolute size of the aperture. With a short lens, diffraction may begin to deteriorate the image by f/8. I'd rather have the option to go into the diffraction limited region myself, but the manufacturers seem to think they are smarter than us. There is little to be gained beyond f/8.0 on these point and shoot cameras. My G3 starts losing resolution beyond f/5.6, and it already has more depth of field than I sometimes care for. Wider than f/3.5 will increase the chance of CA manifesting itself, so I usually shoot on Aperture Value preselection for best quality. Bart |
#4
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Bart van der Wolf wrote:
"AustinMN" wrote in message ... me@ invalid wrote in message ... Why do some these cameras only stop down to f-8? Diffraction "limiting: is a function of the absolute size of the aperture. With a short lens, diffraction may begin to deteriorate the image by f/8. I'd rather have the option to go into the diffraction limited region myself, but the manufacturers seem to think they are smarter than us. There is little to be gained beyond f/8.0 on these point and shoot cameras. My G3 starts losing resolution beyond f/5.6, and it already has more depth of field than I sometimes care for. Wider than f/3.5 will increase the chance of CA manifesting itself, so I usually shoot on Aperture Value preselection for best quality. How about exposure times? I shoot subjects that frequently call for 1 second or more exposure time. Being able to stop down one or two stops will help me gain that. Admittedly, it's at the expense of image sharpness, but why not let me decide which is important to me? Austin |
#5
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"AustinMN" wrote in message ... SNIP How about exposure times? I shoot subjects that frequently call for 1 second or more exposure time. Being able to stop down one or two stops will help me gain that. By closing down the aperture you change more than just the amount of light that is used for the exposure time chosen. You might want shallow DoF and long exposure time. You can use a Neutral Density filter and still have maximum lens performance, assuming you are already at the lowest ISO setting. Bart |
#6
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"AustinMN" wrote in message ... me@ invalid wrote in message ... Why do some these cameras only stop down to f-8? Diffraction "limiting: is a function of the absolute size of the aperture. With a short lens, diffraction may begin to deteriorate the image by f/8. I'd rather have the option to go into the diffraction limited region myself, but the manufacturers seem to think they are smarter than us. I think it's fear of failure rather than contempt for people's intelligence: one incompetent reviewer's opinion about "distorted" images, however unfair, could result in low sales volume for a perfectly fine camera. Quibbling over trivialities has been raised to an artform these days. |
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