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Thread: Search for brighter ground glass for Intrepid 4x5

  1. #11

    Join Date
    Jan 2007
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    California
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    Re: Search for brighter ground glass for Intrepid 4x5

    Quote Originally Posted by Jac@stafford.net View Post
    I have a couple Satin Snow 4x5" screens still in the package. (This is not a For Sale)

    I'll save my impression because I haven't eyesight good enough to critique. But they are so pretty. Regarding usefulness, perhaps others can comment.
    I have and use a couple of Satin Snow screens. They're very good. Unfortunately, they're no longer available.

  2. #12
    Photographer
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    Feb 2001
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    Pine Junction, CO
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    705

    Re: Search for brighter ground glass for Intrepid 4x5

    Quote Originally Posted by Luis-F-S View Post
    Steve Hopf borosilicate glass
    Steve Hopf seems to be out of business. I have tried to contact him several times in the last several months with no luck.
    Keith Pitman

  3. #13
    Dave Karp
    Join Date
    Dec 2001
    Location
    Los Angeles, CA
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    2,918

    Re: Search for brighter ground glass for Intrepid 4x5

    You can find Steve Hopf on eBay as Photofixation. I don't have his email handy now, but I contacted him directly a few months ago and received a very nice new GG from him. I agree, the Borosilicate glass is the best choice.

  4. #14

    Join Date
    Jan 2017
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    7

    Re: Search for brighter ground glass for Intrepid 4x5

    How das the Hopfglas GG compare to a Maxwell screen?

  5. #15

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    Dec 2013
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    Washington, DC
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    63

    Re: Search for brighter ground glass for Intrepid 4x5

    Maxwell’s 4x5 screens are a fresnel and ground glass integrated into a single piece. This type of “enhanced” focus screen provides vastly improved illumination. Check out Alan Brock’s blog and You Tube review to get an idea.

    Hopf’s product is “un-enhanced” (i.e. it’s just glass), but with a very nice grind: the best balance of brightness and sharpness that I have found in a plain ground glass. His borosilicate glass is reputedly stlightly brighter and stronger than regular glass.

    The products and price are so different that a direct comparison isn’t really fair. I tried several options, but once I installed the Maxwell screen, I stopped looking for something better.

    If you want the best ground glass, go with Hopf. If you want the best focus screen, go with Maxwell.

  6. #16

    Join Date
    Feb 2010
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    963

    Re: Search for brighter ground glass for Intrepid 4x5

    How would you determine if it's been acid etched?

    Quote Originally Posted by LabRat View Post
    The sides of the individual grains on the GG have more/less transmission due to the amount of fine grit blasted, but in the old days, some GG's were blasted, then slightly etched with hydrofluoric acid to smooth the grit slightly... (This is a lost art of balancing these points, and now hydrofluoric acid etching is largely banned everywhere...) Some original top GG screens on some RB Graflexes still have these...

  7. #17

    Join Date
    Feb 2010
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    963

    Re: Search for brighter ground glass for Intrepid 4x5

    The other place that does the same type of screens as Maxwell (I believe both are made by the same company) is Canham. His ground glass/fresnel combo is a one-piece solution also, and quite bright. Cheaper and easier to come by than the Maxwell screen I'd think.

  8. #18

    Join Date
    Feb 2012
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    29

    Re: Search for brighter ground glass for Intrepid 4x5

    "Steve Hopf seems to be out of business. I have tried to contact him several times in the last several months with no luck."

    Oh dear, I hope not, I'm waiting on an 8"x10" GG...
    Last edited by rorye; 8-Feb-2018 at 09:28. Reason: Add quote

  9. #19

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    May 2015
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    SooooCal/LA USA
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    Re: Search for brighter ground glass for Intrepid 4x5

    Quote Originally Posted by EdSawyer View Post
    How would you determine if it's been acid etched?
    The etched screens have a slightly glossier surface than just the blasted matte (whitish) surface... The etched surface reflects a little light when held at the right angle, slightly smoother, and holds dust/fingerprints differently...

    Viewing through them, colors are more contrasty/saturated, brighter, more dimensional, a lit glassy TV CRT "effect", but with a very pronounced "hot spot" closer to the center... Everything looks brighter, but might be harder to loupe analyze fine detail up-close for focusing... (And maybe a little harder to read viewing up close, but much better viewing at a slightly extended distance...) This is much more of an "aerial image" viewing, rather than an image that just "sits" on the surface of the GG...

    One might be able to "fake" this effect by dipping glass GG in a gelatin solution to add a little gloss over blasted GG surface...

    Steve K
    Last edited by LabRat; 8-Feb-2018 at 12:44.

  10. #20

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    Apr 2012
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    southeast Idaho, Teton Valley
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    Re: Search for brighter ground glass for Intrepid 4x5

    Quote Originally Posted by rorye View Post
    "Steve Hopf seems to be out of business. I have tried to contact him several times in the last several months with no luck."

    Oh dear, I hope not, I'm waiting on an 8"x10" GG...
    I ordered and received a 4 by 5 GG from Steve Hopf in mid-summer 2017 (I actually got two, as the first was a little bit small and he sent it to me for free). The transaction was not the smoothest, and it took an email or two as reminders, but it worked out fine in the end. I like the GG, and Steve too. My impression is that he is not very organized, but means well.

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