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Thread: What size hole is needed for 210mm APO Symmar lens?

  1. #1

    What size hole is needed for 210mm APO Symmar lens?

    hello

    A beginner asks about a lens board to accept the 210mm APO Symmar lens on a 4x5 Speed Graphic.

    Specifically, would you know the dimension for the lens hole in the board--with this info, I might have a go at crafting my own lens board, to wit: a piece of aluminum stock, cut to size, drilled and painted flat black...

    thank you

    Dean Taylor

  2. #2

    Join Date
    Jan 2002
    Location
    Besanšon, France
    Posts
    1,586

    Re: 210mm APO Symmar lens...

    Hello!
    Congratulations for your Apo Symmar lens !
    The 210 mm Schneider Apo Symmar is mounted on a #1 shutter

    The retaining ring for all #1 shutters is threaded (inner thread) M39x0.75 ; outer ring diameter = 41.6 mm to fit inside a lens board hole 0.2mm broader i.e. hole diameter = 41.8 mm

    Other dimensions for #1 shutters :
    front lens group mounting thread = M40.0x0.75
    rear lens group mounting thread = M36.0x0.75
    distance (front / rear) between reference lens mounting seats = 20 mm +- 0.025

  3. #3
    Marco Gilardetti's Avatar
    Join Date
    May 2005
    Location
    Torino, Italy
    Posts
    32

    Re: 210mm APO Symmar lens...

    Dean, should you want to save some time and work, user "heavystar" sells on that-famous-site-that-used-to-do-auctions Graphic replica lensboards that he makes. They're new, well made, not expensive and I highly recommend them. You may want to buy the one without hole (those with holes are for #0 shutters).

  4. #4

    Join Date
    Feb 2010
    Posts
    1,127

    Re: 210mm APO Symmar lens...

    Yeah, these boards are easy to come by and cheap. Also, if it's a later speed/crown, they don't use a flat board - the stamped aluminum board would be tricky to make yourself. I'd agree- source a Copal 1 sized board (42mm) on Ebay.

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