View Full Version : Congo lens
tonyowen
26-Apr-2020, 03:49
I have an E-CONGO J.R 150mm f4.5 lens.
All of the links I can find on Google to Congo are invalid.
Although this is an enlarging lens does, anyone know what its covering circle is; and is it any use as a 4x5 taking lens?
regards
Tony
Andrew Plume
26-Apr-2020, 04:17
Tony, Hi
I've just sent you two pm's with details extracted from the 'LVM'
regards
Andrew
tonyowen
26-Apr-2020, 04:43
Tony, Hi i've just sent you two pm's with details extracted from the 'LVM'
regards Andrew
Andrew, received and thank you
regards
Tony
Andrew Plume
26-Apr-2020, 05:18
Thx indeed Tony, happy to have helped
regards
Andrew
Chuck Pere
26-Apr-2020, 07:36
This link seems to still work: http://web.archive.org/web/20120419205958/http://www.cosmonet.org/congo/index_e.html
tonyowen
26-Apr-2020, 10:18
This link seems to still work: http://web.archive.org/web/20120419205958/http://www.cosmonet.org/congo/index_e.html
It does thank you, but no mention of the e-congo lens {that I've spotted)
regards
Tony
orgraph
27-Apr-2020, 04:49
Use 90/6.3; 120/6.3;400/8 Light, small, high-quality image
Dan Fromm
27-Apr-2020, 06:34
It does thank you, but no mention of the e-congo lens {that I've spotted)
regards
Tony
It is an enlarging lens, not a taking lens.
tonyowen
27-Apr-2020, 12:34
It is an enlarging lens, not a taking lens.
Yes I stated this on my OP[ing], the questions were does anyone know the image circle and is it [possibly] any use as a taking lens.
ps the above link does include enlarging lenses BUT NOT the 150mm f4.5 lens I have.
regards
Tony
Mark Sampson
27-Apr-2020, 14:26
Apparently it's not a well-known lens, but it's still worth a try. I'd cobble up a lens board and hot-glue the lens to it. I assume that it's not in a shutter, so make a few test exposures when the light is low enough to use a hat over the lens.
One @ f/32, one @ f/16, one wide open. One series at infinity focus, and one close-up. Six sheets of film, one processing run, and you'll have your answer.
Bob Salomon
27-Apr-2020, 14:31
Yes I stated this on my OP[ing], the questions were does anyone know the image circle and is it [possibly] any use as a taking lens.
ps the above link does include enlarging lenses BUT NOT the 150mm f4.5 lens I have.
regards
Tony
You can easily determine the coverage with a piece of cardboard. Turn off all lights in the room, darken the windows, point the lens out the window at a distant object and hold the white cardboard up behind the lens. Move the board towards and away from the lens till the object is sharp on the board. That’s what it covers. Stop down to see how large the circle gets.
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