Super Technika - install new lens instructions puzzle

[Jac@stafford.net]

Linhof Super Technika V

Just curious, no real need to know because the three camera matched
lenses for my Super Technika V were already installed and working well
with the rangefinder.

In the Linhof Super Technika instructions for installing a matched cam
and lens, infinity stops and distance scale, it says to use the
supplied rangefinder target at 15 feet, even to set the infinity stops,
emphasizing that to assure RF accuracy at distances closer than six-feet
the infinity stop check should be repeated until absolutely correct. Does
this imply that 15 feet and beyond need not be so precise?

The setting includes using the ground glass for affirmation.

I am puzzled and ignorant. Why 15 feet? Why not infinity using the
typical mile-away object? And why so simple compared to other LF RF
adjustments?

If necessary I can post a link to a PDF of the instructions.

[Bob Salomon]

Because it is impossible to make the test target large enough at infinity and there is no way that you could do it indoors with a target made for infinity. So they made a test target for indoor use.

[Jac@stafford.net]

Because it is impossible to make the test target large enough at infinity and there is no way that you could do it indoors with a target made for infinity. So they made a test target for indoor use.

Bummer, since we downsized from an eight bedroom farm house to a one-bedroom house. There is not a 15 foot space in the house. 😌

[numnutz]

Bummer, since we downsized from an eight bedroom farm house to a one-bedroom house. There is not a 15 foot space in the house.

Surely you could set a mirror at 7½ feet from the camera, pointed at the target which is 7½ feet away, giving a 15 feet distanced target?


As is done in opticians for eye tests

nn

[Jac@stafford.net]

Surely you could set a mirror at 7½ feet from the camera, pointed at the target which is 7½ feet away, giving a 15 feet distanced target?


As is done in opticians for eye tests

nn

Interesting! Thank you. I do have a large surface mirror.

[Bob Salomon]

Bummer, since we downsized from an eight bedroom farm house to a one-bedroom house. There is not a 15 foot space in the house. 😌

You need more then 15 feet. You need 15 feet from the camera to the target. But you also need to consider the tripod feet and your size behind the camera.