Know anything about Argus Wide Video converters?

Discussion in 'Miscellaneous Equipment' started by waynecrider, May 17, 2011.

  1. waynecrider

    waynecrider Member

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    I inherited a Argus wide (must be video) converter 1:1.8 6.5~26mm. I'm wondering about the "X" factor. I'm thinking it's a .75x multiplier, but I don't know and I can't find anything thru Google. Any ideas?
     
  2. ic-racer

    ic-racer Member

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    I think the Argus brand predated video by a few decades :smile:

    It is probably to extent the zoom range on a super 8 or regular 8 camera.
    I use a modern Tokina converter on my Bolex to get to 4mm-18mm range (from 8mm-36mm)

    [​IMG]
     
  3. waynecrider

    waynecrider Member

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    Here's a picture. The converter has 49mm female threads on the back and is made in Japan. 6 glass surfaces from what I see by way of reflections.
     

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  4. yurisrey

    yurisrey Member

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    sounds like an attachment to R8 or S8 for argus brand consumer film cameras. what type of mount does it have, any pics?
     
  5. yurisrey

    yurisrey Member

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    not 8mm for sure!!! that looks like a wide converter maybe argus-cossina slrs, 70s? could be wrong...
     
  6. waynecrider

    waynecrider Member

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    It's a 49mm female screw mount.
     
  7. yurisrey

    yurisrey Member

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    argus-cossina wasn't the only one with 49mm screw mounts for 35mm SLRs there were various other models by other brands, Sears etc; it converts a medium lens down to a wide angle. in which case you divide by the given ratio on the lens: 1:1.8. Thus on your 50mm camera lens if your focus rings says 20' its really 11' with the converter on (20/11=~1.8) or on the opposite end 4/1.8=2.222 etc; which is rounded up to 2.3'.
    initially, i was thrown off by the "video" part.
     
  8. waynecrider

    waynecrider Member

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    I to was confused as I could not find anything as to it's use whether as a camera OR video converter.

    The inside cap of the converter has a chart which gives the focus distance as explained by you. I'm confused tho as to how that translates to field of view.
     
  9. yurisrey

    yurisrey Member

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    you'll get a more macro fov. it nearly doubles your field of view but changes your dof as well.
     
  10. ic-racer

    ic-racer Member

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    Ok thanks for posting the picture. Looks like it is to go on a normal lens for a 35mm camera as a wide angle conversion. The fixed lens 35mm rangefinders (Konica, Yashica etc) usually had these as add-ons. The one you have may work on other formats also*.
    If you don't have a camera with a 49mm thread, can't you just hold it up to the front of the lens and see what it does?

    (*That one I'm using on the Bolex also has a 49mm thread.)
     
    Last edited by a moderator: May 18, 2011
  11. waynecrider

    waynecrider Member

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    I've actually had it on a lens and on a D camera to see what was up with it. I'm thinking, and have yet to prove, that it's giving me a 42mm fov, but I don't know if I'm figuring that out correctly. I'll have to compare it to my 35mm Nikon lens today I guess and see. I was just really wondering how you figure the fov out mathematically.
     
  12. yurisrey

    yurisrey Member

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    i'm not too familiar with D cameras, from what I gather from camerapedia they usually have a 68mm equivalent lens, so 68/1.8 is ~37.777. If so for 120mm format you'd get almost twice the field of view as you'd normally would get, for example my Kiev uses a 30mm Zodiak 8 wide-angle lens attachment. They [Dianas] do accept 49 fem adapters don't they?
     
  13. ic-racer

    ic-racer Member

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    1) Point at wall
    2) Mark FOV
    3) Measure distance to wall
    4) Measure FOV
    3) Consult Pythagoras :smile: