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Thread: Lens I am not familiar with..

  1. #1

    Join Date
    Jun 2004
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    Montana
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    Lens I am not familiar with..

    Well, I went into a second hand store here locally on Saturday and ended up buying a $25 box of photo junk(stuff) included was a lens I am not familiar with, it says Astron 105mm f/4.5 it is a barrel lens mounted in what appears to be a copal shutter, although there is a mylar sticker over the normally engraved shutter name, I pulled the mylar sticker off and the original name of the shutter has been scratch off and replaced with the sticker which reads camtron, I of course presume this is an enlarger lens that has been mounted in the shutter, but I am not familiar with this lens brand, anybody able to point me in the right direction to find out if good, bad or indifferent, also, without not knowing anything about it, I am wondering if it will cover 4x5?

    Thanks for any help.

    Dave

  2. #2

    Join Date
    Dec 2000
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    Tonopah, Nevada, USA
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    Re: Lens I am not familiar with..

    Dave, lots of this stuff was used in the mid 70's for oscilloscope type Polaroid applications. That'd be my guess. A 4.5 105mm is almost always a tessar type. It won't quite cover 4X5 at infinity but for CRT applications they were at 1.5:1 or so and would cover the Polaroid Pack film sizes fine.
    He is no fool who gives what he cannot keep..to gain that which he cannot lose. Jim Elliot, 1949

  3. #3

    Join Date
    Dec 2001
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    NJ
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    Re: Lens I am not familiar with..

    Dave, why don't you ask the lens what it is? Count reflections, and if it is a tessar type (4 strong reflections, no weak ones in front of the diaphragm; two strong, one weak and perhaps hard to see, behind) then you know it won't cover 4x5 at infinity.

    Cheers,

    Dan

  4. #4

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    Re: Lens I am not familiar with..

    Thanks Guys.

    Dave

  5. #5
    Maris Rusis's Avatar
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    May 2006
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    Noosa, Australia.
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    Re: Lens I am not familiar with..

    I have an Astron 150/4.5 and it is definitely a Tessar type enlarging lens. At enlargements up to 4x, aperture at f.8, sharpness, contrast, and flare are OK.
    Photography:first utterance. Sir John Herschel, 14 March 1839 at the Royal Society. "...Photography or the application of the Chemical rays of light to the purpose of pictorial representation,..".

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