"commercial" astragon lens?

[edward_kang]

I have just bought a lens marked 210mm Commercial Astragon.

 

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Questions:

 

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1) Who made this lens?

2) What is center and edge sharpness for this particular lens?

3) What year was this lens made?

4) Is this lens achromatic?

 

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I can't find ANY information about this lens on the web, other than some vague info about its image circle (which is not worth a whole lot to me).

 

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Please help me, thank you.

[david_clark4]

Hi Edward, I think you got yourself a Japanese Congo. I think they are

Tessars or Kodaks. On SK Grimes site under links you can find your way

to the Congo Lens company. Although some folks don't like them, I

don't know why they are any worst than any other Tessar design. I have

a 240mm in Copal 3, it seems to work; I'm not a sharpness maven like

some, and a Copal 3 is kind of a big shutter for 240mm, but the price

was right, the shutter is reliable, and I can use 52mm filters with

it. Best, David

[edward_kang]

thank you david. Your help is appreciated VERY much!!

[bob_salomon3]

Astrogon and Commercial Astrogon lenses were a private lable

line from, I believe, Strling Howard in NY in the 50s and early to

mid 60s.

[jeremy_rardin]

I received this lens today, *saw* it work perfectly, but when I got home, cocked the shutter, triggered it, then tried to cock it again IT DIDNT WORK! What on earth could be wrong? Is there some kind of trick?

[skopar]

<p>Hi Jeremy,<br>

Did you ever figure out what was wrong with your lens? </p>