Quoted:
Quoted: Skip the D1 series. If you can pony up bucks for D2x, you will be happy, otherwise teh D200. With the D200 you get the magnification factor of 1.5x. This will make the 400mm lens a true 600 mm lens. Might be helpful in the PI stuff.
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No! The 1.5x crop factor does not "turn" any lens into another. It merely crops the image off so that it appears to be taken with a longer focal length lens, but the DOF, perspective, etc. lens traits will still be of whatever lens you are using.
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Sounds like a medium format photographer defending 50mm lens.
It is about the image capture area.
In the case of the lens capturing "more" of the area than required, that is zoom. All other lenses are designed to give a frame size to exactly match that of the medium (optimal, all else is wasted).
On this concept, an f 0.8 lens will be financially magnitudes less with a smaller, yet sensitive sensor (24mm) compared to a 35mm film lens.
--ETA: Try to guess what a lens would cost for a large format (8" x10") phtoographer to achieve 10x distance amplification.
Add that to media costs of 8x10 film, and you see the reason 35mm emerged as "The Choice" for every image you see in Sports Illustrated. If they can keep the same or better image quality at a lower price and faster shooting rate, I am all for "over-using" my lenses.