On 2 Jan 2001, at 19:59, Terry Danks wrote:
> Still, I do not quite understand how the D30 actually manages to turn
> the image from an "x mm" lens into the equivalent of an image formed
> by a longer lens. Is the viewfinder of the D30 such that it appears
> to be a telephoto shot? How is the image formed without turning the
> lens into a slower f stop as well? How does this work? What is thrown
> away? I am perplexed.
The lens' focal length and f/ratio stay the same. You're just using
just a smaller part of the image circle. As if you were cropping.
If you make a pair of 4x6 prints from the center of a 35mm negative
and the whole 35mm negative, the one from the smaller area will look
like it was shot with a longer lens...even though it wasn't. Same
deal...like APS.
What is thrown away is the outside part of the frame...and some
resolution...but depending on the # of pixels involved, that may not
matter, I don't know about the D30...
The 1.6 <?> factor is just used to relate the angle taken in by the
camera to 35mm, which most folks are used to.
If 50mm is normal in 35mm, 80mm is normal in 6x6, and about 30mm is
normal for the D30.
HTH,
Lee
--
Lee Hiers, AA4GA
Cornelia, GA
[EMAIL PROTECTED]
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