Posted by jon wells on September 06, 2000 at 23:51:09:
In Reply to: Re: Kalart Adjusment Question posted by Les on September 06, 2000 at 07:49:32:
Thanks for the response. To check my understanding, you make two
targets (on the wall for instance), one on a level parallel line
with the rangefinder window, the other on a level parallel line
with the lens. A couple of questions.
1) what then?, 2) given my 135mm lens and 4x5 combo, should the
camera be at 3.5 ft rather than 4 ft?, 3) what's the significance
of the distance between the bottom of the camera and the
rangefinder window (Kalart manual measures this at 6.75" for a 4x5
press camera)?
: : I'm adjusting my Kalart rangefinder for near focus,
: : which for my 4x5 with 135mm lens is 3.5 feet. This
: : creates a parallax problem at this distance. According
: : to the manual, you compensate by lining up the RF
: : window and lens in a particular manner. While
: : outlined, the instructions are unclear to me. I'm
: : looking for some clarification as to exactly what I'm
: : supposed to do. The instructions are shown in a box at
: : the bottom of page 8 of the on-line manual at
: : http://www.graflex.org/speed-graphic/kalart-manual.html
: : The three vertical distances are difficult to make out,
: : but appear to be from left to right 6 3/4", 6", 5 1/8".
: : A text-only version discusses this issue in the last
: : three paragraphs of
: : http://www.graflex.org/speed-graphic/kalart-adjustment.
: : html.
: : Any held is very much appreciated.
: I don't have my book with me so I can't give you the specific dimentions but the idea is to creat two targets on one board. The distance from the bottom of the board to the center of the targe is the same distance from the bottom of the camera to the center of the lens.
: The second target, still on the same board, will have the same
bottom to center distance as the rangefinder. The spacing between
these targets is the same as the spacing between the lens and the
rangfinder on the camera.
: this way all sight lines are parallel, just keep the board
parallel to the ground gla s s.