From: David Parsons
The f/number is a ratio of the focal length to the diameter of the
aperture opening. The 400 at f/8, has an opening of 50mm (The actual
opening may not be 50mm, depending on where in the lens the aperture
is placed). It has nothing to do with the sensor or film size.
On Wed, Mar 24, 2010 at 3:18 PM, John Sessoms <[email protected]> wrote:
> Also, is the actual diameter of the aperture at f/8 the same for the APS-C
> sensor as it is on a film frame? [note question mark]
>
> The mechanical stop is going to be f/8 on the film frame.
Yeah, I understand f/8 is 400/8 for this lens on any camera.
I was just wondering if the computer in the camera might be fudging a
little because of the size difference between the sensor and the film
frame. I guess not.
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
