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Thread: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

  1. #1
    Mark Sawyer's Avatar
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    Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    Does anyone know if this is a typical Plasmat design?

    BTW, it's a wonderful lens, covers 8x10 with slight movements, bright and quite sharp to the edges, convertable to 14", fairly common, often at $200 or so for a clean one.

  2. #2

    Re: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    Mark,

    According to the Ilex catalog it's 6 elements in 4 groups.

    Have fun with it.

  3. #3
    Mark Sawyer's Avatar
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    Re: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    I'm bumping this one to the front, as I'm still curious. I'd love to have a longer focal length version of this lens to go along with the 215mm. Does anyone know if the 300mm Caltar S is of the same design as the 215mm f/4.8 Caltar S?

  4. #4

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    Re: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    I just went and looked at the 14-3/4" f/6.3 Ilex-Caltar in the lens cabinet. I remembered that it's not convertible, and a closer look suggests that it's a Tessar-type lens. BTW, you can find posts on photo.net from Lynn Jones, who worked at Ilex and may have had a hand in designing these lenses.

  5. #5

    Re: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    Mark,

    The Ilex catalog only lists a 6", 7", and 8.5" in the f/4.8 series, nothing longer.
    No listing for the 300mm Clatar S, sorry.

  6. #6

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    Re: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    The f5.6 Symmar Convertible 300 / 500 should look and act just like your 215. Same era same type etc. They're not too expensive.

  7. #7
    Mark Sawyer's Avatar
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    Smile Re: Design of 215mm (8.5") f/4.8 Caltar S/Acuton lens

    Thank you, Jim! Looks like I may have a convertable Symar in my future! And thank you, Paul!


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