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I am familiar with the lens focal lengths for a film camera. Is there a site
where I can find comparison with digital focal lengths?

I haven't taken my best picture yet.

"LEICA" <> wrote in message
news:...
> I am familiar with the lens focal lengths for a film camera. Is there a
site
> where I can find comparison with digital focal lengths?
>
> I haven't taken my best picture yet.

Not sure such a chart would be valid, because there are different-sized
chips in use. So an equivalent focal length for one camera might not
necessarily be the same for another.

You would need to know what sized chip your camera uses in order to
calculate the 35mm equivalent correctly.

(LEICA) writes:

> I am familiar with the lens focal lengths for a film camera. Is there a site
> where I can find comparison with digital focal lengths?

They're not all the same.

The consumer digicams, however, cite "35mm equivalent focal lengths",
which for angle of view purposes are directly comparable to 35mm
lenses.

The DSLRs cite a "cropping factor" (the Nikons are all 1.5x, the
cheaper Canons are 1.6x, and so forth), which can be applied to the
actual focal length of a lens mounted on them to get the focal length
which would have the same angle of view on a 35mm film camera.
--
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LEICA wrote:

> I am familiar with the lens focal lengths for a film camera. Is there a site
> where I can find comparison with digital focal lengths?

Most digital camera makers and digital camera reviewers quote focal
lengths in 35mm lens equivalents..

Actually, it's uncommon to see otherwise. Focal lengths don't mean
much until you know the size of the sensor behind the lens.

"LEICA" <> wrote in message
news:...
> I am familiar with the lens focal lengths for a film camera. Is there a
site
> where I can find comparison with digital focal lengths?
>
> I haven't taken my best picture yet.

I answered this for the D70 in the "Newbie Lens/Focal Length Question"
thread.
One thing I forgot to say in that thread was that in order to calculate the
diagonal
you square both of the sensor dimensions, add them together, then take the
square
root.

HTH,
George

"LEICA" <> wrote in message
news:...
> I am familiar with the lens focal lengths for a film camera. Is there a
site
> where I can find comparison with digital focal lengths?
>
> I haven't taken my best picture yet.

Depends on the sensor size, most dSLR that use a Sony sensor APS-C/DX
(Minolta, Pentax and Nikon) you use a 1.5 factor. With Canon dSLR you would
use 1x, 1.3X or 1.6X depending on which camera you have.

>One thing I forgot to say in that thread was that in order to calculate the
>diagonal
>you square both of the sensor dimensions, add them together, then take the
>square
>root.
>
>HTH,
>George
>
>

Sorry George , you lost me. Guess I'll just start using me extra Canon lenses
on the Digital Rebel and learn about changes in focal length as I go.

I haven't taken my best picture yet.

"LEICA" <> wrote in message
news:...
> >One thing I forgot to say in that thread was that in order to calculate
the
> >diagonal
> >you square both of the sensor dimensions, add them together, then take
the
> >square
> >root.
> >
> >HTH,
> >George
> >
> >
>
> Sorry George , you lost me. Guess I'll just start using me extra Canon
lenses
> on the Digital Rebel and learn about changes in focal length as I go.
>
> I haven't taken my best picture yet.

Sorry if I confused the issue. If you like, for your Digital Rebel what you
want to
do if you are used to thinking in terms of 35mm focal lengths:

Take the 35mm focal length lens you'd use and divide it by 1.6 to figure out
what
focal length would be equivalent for your Digital Rebel sensor, for example:

35mm camera lens Digital Rebel lens
---------------------------------------------------------------------
20mm 12.5mm
---------------------------------------------------------------------
24mm 15mm
---------------------------------------------------------------------
28mm 17.5mm
---------------------------------------------------------------------
35mm 22mm
---------------------------------------------------------------------
50mm 31mm
---------------------------------------------------------------------
85mm 53mm
---------------------------------------------------------------------
100mm 62.5mm
---------------------------------------------------------------------
200mm 125mm
---------------------------------------------------------------------
300mm 187.5mm
---------------------------------------------------------------------
400mm 250mm
---------------------------------------------------------------------

The way to read this, is if you'd use a 400mm lens on your 35mm camera,
you'd choose a 250mm lens on your Digital Rebel.

George

(LEICA) wrote in
news::

> I am familiar with the lens focal lengths for a film camera. Is there
> a site where I can find comparison with digital focal lengths?
>
> I haven't taken my best picture yet.
>

They're exactly the same.

--
http://www.neopets.com/refer.phtml?username=moosespet

(LEICA) wrote in
news::

>>One thing I forgot to say in that thread was that in order to
>>calculate the diagonal
>>you square both of the sensor dimensions, add them together, then take
>>the square
>>root.
>>
>>HTH,
>>George
>>
>>
>
> Sorry George , you lost me. Guess I'll just start using me extra Canon
> lenses on the Digital Rebel and learn about changes in focal length as
> I go.
> I haven't taken my best picture yet.
>

There are -no- changes in focal length.

--
http://www.neopets.com/refer.phtml?username=moosespet