difference between prosumer n slr


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May 19, 2006
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#1
i own a olympus c-750. on my cam the aperture setting is only available between f/2.8-f/8. isit that only in a slr cam can i acheived a small aperture size of f/16?
 

Snoweagle

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Jan 26, 2005
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corporal007 said:
i own a olympus c-750. on my cam the aperture setting is only available between f/2.8-f/8. isit that only in a slr cam can i acheived a small aperture size of f/16?
Usually for prosumers their smallest aperture is around f/11. SLRs/DSLRs usually can reach a max of f/22 - f/38, depending on the type of lens used.
 

hwchoy

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Jul 16, 2003
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#3
what happens is that in digicams, the physical focal length of the lenses is very very short already, in the region of 5mm. as aperture is expressed as a division of the focal length, an ƒ/8 on a digicam would be the same as ƒ/80 on a 50mm 35mm format lens. when it comes to such small physical number, the actual absolute number becomes important, since a 5mm lens at ƒ/8 gives you an aperture of only 0.625mm which is VERY SMALL and hard to engineer properly. also at that kind of microscopic size, diffraction becomes an issue.
 

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