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Thread: Why do my Beseler enlargers have a spacer between heat absorbing glass and condenser?

  1. #41

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    Re: Why do my Beseler enlargers have a spacer between heat absorbing glass and conden

    My two genuine Beseler CB7 heat absorbing glasses are 1/8" thick (AKA Double-Strength). To me, the color looks just slightly greener than plain window/framing glass (3/32"). One is factory installed, the other not. Neither has a mark or dot, of any color, alone the edges. Both are slightly smaller in diameter than the condenser tube -- about 1/16" -- which would allow for expansion -- although it is held in place by four metal tabs that would make expansion difficult. (I'll check into that aspect.)

    When I get around to it, I'll add it to the top of my condenser assembly while maintaining some space between the two heat absorbing glasses -- there is plenty of room in the condenser structure.
    Last edited by xkaes; 12-Nov-2017 at 10:06.

  2. #42
    Randy Moe's Avatar
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    Dec 2011
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    9,258

    Re: Why do my Beseler enlargers have a spacer between heat absorbing glass and conden

    https://www.edmundoptics.com/optics/...sorbing-glass/

    Custom sizing available.

    Not free.

    Mounting position could be closer to source.

    Please explain your project scope and parameters.

    20 minute wide open enlarging may be interesting.

  3. #43

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    Re: Why do my Beseler enlargers have a spacer between heat absorbing glass and conden

    Quote Originally Posted by Randy Moe View Post
    [url]20 minute wide open enlarging may be interesting.
    Thanks for the link.

    No, I do not use my point light source with a lens wide open for 20 minutes exposures. I only use long exposures with my diffusion light sources with filters with the lens stopped down for mural-sized prints. I can easily have one minute exposures for 11x14" prints. I don't see why it is surprising to some that a VERY long exposure would be needed for an eight FOOT print -- that might be made from a cropped section of the negative -- really a portion of a 24 foot print! (I'm sure somebody will respond, "You can't do that!", or some other nonsense.)

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