----- Original Message -----
From: "Rob Studdert"
Subject: Re: OT: That tilt feature
Great for landscapes I expect, so just how wide can you go with this
set-up on
the DS?
Collin has discovered the Scheimpflug principle......
As a means of altering the plane of DOF, it is used routinely by large
format camera users, and by those lucky souls with Zorkendorfer adaptors or
tilt/(shift) lenses.
Having tried this briefly with my 6x7 mounted to a view camera, I'd say the
usefulness is going to be a bit limited with small cameras because at some
point the body of the camera is going to vignette the image projection
coming off the lens.
With small format digital used for landscapes, I doubt very much if there
would be much call for it, just based on the huge anount of DOF that the
shorter focal length lenses allow.
There is also the problem of back focus and bellows draw. This is somewhat
lessened by the fact that the focal plane is dropped back some 45mm from
where it typically would be, but is a bellows is squished too flat, you
don't get much movement.
I can use a 75mm lens on my Tachihara, but with no movements because the
bellows draw is so short, I can use very limited movements with my 90mm
lens, and full movements, within the limitations of the image circle with my
150mm lens and longer.
William Robb
