 Jimmy Lam |
fixed-focus and selective focus Hi, Question 1: Do all digital cameras only have fixed-focus lenses? Question 2: Can a digital camera has Thanks you very much for your help and time in advanced! Jimmy Lam
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BetterPhoto Member |
Hi Jimmy. There are selective focus lenses available, ZOOM LENSES. Most D-SLR cameras which house interchangeable lenses come in kits with a starter lens that is normally one of either an 18-55mm or so zoom or a 28-80mm or so. It used to be with lenses for film cameras which were fixed focal lengths were of much superior quality to zooms due to less interior elements, but this has not been an issue with most lenses for near 15 years. Chris Walrath
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Jimmy Lam |
Hi Chris, Thanks for your answer! Have a nice day! Jimmy Lam
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Christopher A. Vedros |
"Fixed-focus" is not the same as "fixed focal length". Likewise, "variable focus" is not the same as "variable focal length" or zoom. A "fixed-focus" lens is a small lens with no moving parts, usually found in low-end point & shoot cameras. An example would be the single-use disposable film cameras - most of these have fixed-focus lenses. These cameras combine a simple lens with a very small aperture to get a large depth of field, so that any subject from a few feet to infinity will be in "acceptable focus". A "variable focus" lens is every other lens that has moving elements to achieve focus at different subject distances. This would include both manual focus lenses and autofocus lenses. Fixed-focus lenses can be found on very cheap digital cameras and very cheap film cameras.
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