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Expert: John Oliverio - 3/27/2009


Question
Why is a F2.0 lens better than a F2.8 lens?

Answer
Adam,
Hello and thanks for the question.

Well, if you go on that one specification alone.....  it's because the 2.0 is a little brighter (faster) than the 2.8.  However, speed is not all there is to a lens.  You can't compare on brightness alone.  There are a lot of quality issues to consider in a lens.

Sharpness/resolution
Pin cushion distortion
Barrel distortion
Chromatic aberration
Bokeh
Vignetting
Fall off
Flare
Color fidelity
Mechanical quality
Auto focus speed
Vibration Reduction (if it has it)
Performance at different apertures

That is all I can think of.  There might be more.

John

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John Oliverio

Expertise

I can answer questions about point and shoots and 35mm SLR`s from the 1960s to present. I can also handle most questions on digital cameras from "camera" makers, like Nikon, Olympus, Canon, Sony, etc. Though usually I`m not too familiar with the driver interface, as 3rd party devices for download are more efficient. Sorry, but I can no longer answer questions about the value of old cameras.

Experience

I'm an "expert" under photography. I've many years experience in photo retail.John and Chris
Genuine AllExperts Expert
http://www.allexperts.com/displayExpert.asp?Expert=9938


Organizations
IDIG (internet digital imaging group)

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