It seems to be an article of faith that DSLRs are faster than point and shoot cameras. Is this just because manufacturers put their best technology in their DSLRs and so they focus, store images and shoot again faster? Or is their something inherent in the design of a DSLR that makes it faster? The wikipedia article on DSLRs mentions fast phase detection autofocus which is apparently not available/practicle on a point and shoot. Are there other things about DSLRs that give them lower shutter lag? Things that let them shoot faster shot-to-shot?
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Generally I'd say it's because DSLRs are bigger that they have more cache ram, which is what fills up when you're taking continuous shots. They also have a bigger battery, and often better processors and dsps to afford faster conversion of the data from the sensor to the format of the file. Sometimes they're even made to be able to write to a sufficiently high-speed card indefinitely. Certainly part of it does have to do with the firmware features written into the better models that enable a continuous autofocus and light reading at the same time. |
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It boils down to size / battery / heat economics. Sure, you could cram the same firmware, buffer capacity and battery capacity from a DSLR into a sub compact pocket camera, however the thing would soon get too hot to hold (and probably a bit bigger to begin with). Even expensive DSLRs that have a 24 FPS sampling rate for HD video get too hot to continue after about an hour with a relatively cool ambient heat. Shot outside in 100 degree sunshine, the capacity would significantly reduce. I think someone shopping for a POS would rather have a light and thin design that leaves room for a higher capacity battery rather a small brick that could shoot at 9FPS. Someone wanting 9FPS would prefer a bigger brick, known as a DSLR :) |
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First of all it is probably because of the bigger hardware and performance each part can achieve. Speed is also a factor of the little motors moving the shutter as well as the internal buffer which pre-saves pictures after they are taken. Point and Shoot cameras don't really have a real shutter therefore everything is kinda calculataed -> more delay after taking the shot. Modern DSLR cameras allow up to 40 or 50 shots in a row without saving them to the card or delaying the camera in any way. They support different lenses with different apertures. An aperture of 1.4 running on a full frame sensor bears every point and shoot camera with their tiny sensor and their tiny lenses, because it doesn't let enough light through. As well in a SLR all parts are kinda hardware except the sensor and the saving stuff. in a P&S camera, everything is digital.. even the zoom.. |
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