Focus chart for rangefinder cameras (just print and test)

[Rust]

I found a good focus chart and want to share it with other forum members.
I tested my Jupiter-3 and as expected it showed 5 cm (2 inch) backfocus at distance 1.2 m.

You can download this chart and print it: DOWNLOAD (300 dpi, size 24×15 cm).

 

[Moriturii]

Cool, just what I need, then glue it on a piece of cardboard to make it stable? Are those checkers supposed to be 45degrees out I assume?

 

[Rust]

Yes, you are right! Print the chart, glue to carton, bend checkers to 45 degrees and test!

 

[Shane Guthrie]

Thank you very much.

 

[Rust]

Some test pictures for example. Jupiter-3 50mm @ 1.5, 2, 2.8

 

[bobby_novatron]

Excellent! Thanks a lot for sharing this. Very helpful.

 

[pordiosero]

Only one question. I´m not so used to rangefinder cameras, and after having ALMOST adjusted my Zorki 3M w/ Jupiter 8, I´ve one doubt.

I´m not sure if it makes a big difference, but when testing the rangefinder accurancy, should the subject be exactly in front of the viewfinder, exactly in front of the second frontal window, or exactly in front of the middle of both? May be it´s only a difference of 1 or 2 cm, but if we are checking slight dissadjustments, in my opinion it´s a waste of time not to consider these things...

Or may be I´m wrong. Who can help me?