[MF3D.FORUM:73] Re: New viewer for least talked about format

[Brian Reynolds <reynolds@xxxxxxxxx>]

Bill Glickman wrote:
> What exactly is a sliding lens board.. this obviously takes two
> images on piece of film..do you fire the shutter just once?  Is
> there a link to a pix, so I can see one.. I am very interested..
> 

Large format cameras are generally not the rigid boxes that most
smaller format cameras are.  With most large format cameras you can
move the lens and camera back in relation to each other.

Moving the lens (or back) sideways is shift.  Up and down is
rise/fall.  The front (and sometimes the back) can also be rotated
about an axis (which may be through the centerline of the lens or
back, or maybe through the base).  Rotation about the horizontal axis
is tilt, and rotation about the vertical axis is swing.

The various shift or tilt/shift lenses for 35mm and MF are based on
the movements available on large format cameras.  On a large format
camera (that has movements), all lenses (that cover more than the
minimum for the format) are tilt/shift lenses.

These movements are used to correct distortion (e.g., keeping
buildings straight for architecture shots) or providing more depth of
field.

-- 
Brian Reynolds                  | "Dee Dee!  Don't touch that button!"
reynolds@xxxxxxxxx              | "Oooh!"
http://www.panix.com/~reynolds  |    -- Dexter and Dee Dee
NAR# 54438                      |       "Dexter's Laboratory"