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Old Aug 8, 2002, 12:16 PM   #1
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Join Date: Aug 2002
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Default pixels + long lens

what advantage if any in 4 megapixels
versus 2 megapixels when using a six
to ten power glass zoom?
dkybrd is offline   Reply With Quote
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Old Aug 8, 2002, 4:25 PM   #2
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Join Date: Jun 2002
Posts: 385

You are comparing things that aren't directly related and confusing some other terms.

The term "power" doesn't apply to camera lenses. That term applies to binoculars and telescopes which magnifiy an image based on the apparent size when viewed with the naked eye. Digicam lenses are usually specified in a zoom _ratio_ of longest focal length divided by shortest. Most zoom ratios are comparable to each other as long as the angle of view at the shortest focal length is similar. A 10x digicam zoom is not the same as a 10x binocular.

A four megapixel image is that much bigger than a 2 megapixel image and can be printed larger. A typical 2mp image, 1600x1200 will make a good inkjet 8x10 but if you print bigger or crop the original much you'll start to see jaggies. A 4mp image might make it to 11x14 without loss in quality.

That said you aren't giving enough information to make a valid comparison. Throw in some more specifics and you'll have a better idea of what is "best" That is the intended result of the output? Web use? Print?
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