Re: Exact fl of lenses... 220 VR

[gene360@xxxxxxxxx]

Andy,

        Bill is giving this "FL being different @ different speeds" senario because
( and thank God)
it's the only variable that we as consumers/users can change! We can't change the
accuracy of
rotational speed increments. (Hope this makes sense!)


ADavidhazy wrote:

> >        As I mentioned before, 4 mm off on fl, creates blurred edges in all
> > my tests,  if that is acceptable to some people, then this should not
> > concern them.  If you are after big enlargements, then one better be
> > careful...
>
> I agree. You must know the focal length but this is not a factor that changes
> with the exposure time you use on the camera, ... is it? That is my
> "objection". The focal length of a given lens is not a variable. To determine
> the focal length of a lens precisely one uses a nodal slide generally. Most
> lenses are stamped with approximations to their actual focal length. For
> precision panoramic work you should go to the trouble of determining the actual
> focal length of the lens.
>
> Andrew  o o  0 0 o . o  Davidhazy, Imaging and Photo Tech
>          \/\/\/\/\/\/          http://www.rit.edu/~andpph
> __________|        |_____________________________________