[EMAIL PROTECTED] wrote:
> Tim,
>
> > Why not try setting your flash to 80mm manually, and see what the result is?
>
> This is an excellent suggestion. Will try as soon as I get
> to it. And a trick to remember. Manually setting the
> (apparent) focal length to save battery power.
>
> I mounted the 28-70 on the D30 last night along with the 550.
> Looking at the LCD display, it matched the lens focal length,
> using the well-known steps. It looks like the D30 doesn't
> have enough "smarts" to take the focal length multiplier into
> account for sending signals to the 550.
But is there really a focal length multiplier in effect? Isn't it just that the
digital sensor uses a smaller portion of the image circle presented by a lens, so
that when the image is enlarged to any given size, the magnification of the image
is greater with the digital image than with 35mm film enlarged to the same size
(*not* by the same factor), thus producing a "multiplier" effect? Consider that
putting a 2x converter on a lens and enlarging an image made with that same lens
without converter by 2x will produce the exact same result in terms of
magnification and depth compression--isn't that essentially what's happening with
the D30?.
The corollary question is, does the angle of view of a lens change just because
the receptor is smaller, or is angle of view strictly a function of the physical
and optical design of the lens? I don't know, which is why I'm asking, but it
seems to me you would want the camera/flash combo to recognize the actual lens
you've mounted, and not some imaginary "multiplied" lens.
Just a thought. . . .
fcc
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