Results 1 to 8 of 8

Thread: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

  1. #1

    Join Date
    May 2018
    Posts
    93

    Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    I've got a Dallmeyer 3B, what I believe is a newer model with a black barrel, photo attached. I'm wondering if anyone has a matching lens with a set of waterhouse stops that they wouldn't mind scanning and sending me images of. I've found a thickness of black plastic I can get laser cut which fits nicely into the waterhouse slot (also seems to work well as a partial dark slide), and I'm thinking I could probably just get a set of plastic stops made that would work in a pinch for a lot less than getting a set of metal ones machined.

    Click image for larger version. 

Name:	IMG_20181010_090523 (1).jpg 
Views:	25 
Size:	46.2 KB 
ID:	184166

    Click image for larger version. 

Name:	IMG_20181010_092250.jpg 
Views:	19 
Size:	57.4 KB 
ID:	184167

  2. #2

    Join Date
    Jul 2001
    Location
    San Francisco, CA
    Posts
    572

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    Yup, that's a pretty late one. Not sure how much the stops changed over time. I think the slot on my 3B (1889) is 87mm wide. Yours?

  3. #3

    Join Date
    May 2006
    Location
    Scarsdale, NY
    Posts
    320

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    Just a thought - you might check the plastic for opaqueness.

    Charley

  4. #4

    Join Date
    Sep 2008
    Location
    Greater Toronto Area - Mississauga
    Posts
    727

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    Quote Originally Posted by bieber View Post
    I've found a thickness of black plastic I can get laser cut which fits nicely into the waterhouse slot (also seems to work well as a partial dark slide), and I'm thinking I could probably just get a set of plastic stops made that would work in a pinch for a lot less than getting a set of metal ones machined.
    If you are going to farm out the laser cut, you could probably get metal ones cut via plasma, abrasive, or water jet, rather than machined. The difference is likely just the material costs.

    It is something I have been thinking about, but not yet looked at it in detail myself.

  5. #5

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    5,612

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    The forum links at the bottom of this page will give you plenty of extra information. Especialy:-

    http://www.largeformatphotography.in...s-Dallmeyer-3B

    Making Waterhouse stops out of brass is easy when you have a lathe, but time consuming without!
    There is really no reason why these these shouldn't be made with black card, scissors and a sharp blade. I have made dozens of brass and card sets and they work equally well! And card doesn't scratch the barrel around the Waterhouse slot.

  6. #6

    Join Date
    May 2018
    Posts
    93

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    Quote Originally Posted by karl french View Post
    Yup, that's a pretty late one. Not sure how much the stops changed over time. I think the slot on my 3B (1889) is 87mm wide. Yours?
    It's hard to get my caliper in there precisely, but it looks like I'm within a few tenths of a millimeter of 87mm.

    Quote Originally Posted by Len Middleton View Post
    If you are going to farm out the laser cut, you could probably get metal ones cut via plasma, abrasive, or water jet, rather than machined. The difference is likely just the material costs.
    .
    I'd love to, do you know of a service that could do the cutting affordable? I can get plastic laser cut pretty cheap by Ponoko, but their metal cutting is up in the hundreds of dollars range.

    Quote Originally Posted by Steven Tribe View Post
    The forum links at the bottom of this page will give you plenty of extra information. Especialy:-

    http://www.largeformatphotography.in...s-Dallmeyer-3B

    Making Waterhouse stops out of brass is easy when you have a lathe, but time consuming without!
    There is really no reason why these these shouldn't be made with black card, scissors and a sharp blade. I have made dozens of brass and card sets and they work equally well! And card doesn't scratch the barrel around the Waterhouse slot.
    Neat, thanks. I found a drawing on the collodion bastards group I can hopefully use as a basis as well. I guess my main concern, which I'd kind of hoped to sidestep by getting scans from a working set, is if cutting the correct hole sizes is really as simple as dividing the focal length (11.5", right?) by the f-number to get the diameter. Or are there other practical concerns to take into account when cutting stops for a real life lens rather than the theoretical version?

  7. #7

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    5,612

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    The link I gave included a post from me pointing out that there is some difference between the actual length of the WHS during the many decades of production! Eddie, who had a project some time ago with semi - commercial reproduction project brass stops for the beloved 3B (!!), found variation in size too!

    The physical diameter of the stop holes is only an approximation of the real aperture size. The "seen" diameter - looking at the aperture through the front lens - is real dimension to be used in the magic equation.

    There must be an equation to find the effective aperture based on the focal length of the front lens. That is, to produce a correction coefficient to convert physical diameter measurements to optical diameter.

    I have seen a number of "original" Dallmeyer stop sets, which obviously didn't follow the usual stop sequence as diameter sizes fell by the same amount with reduced apertures.

  8. #8

    Join Date
    May 2018
    Posts
    93

    Re: Anyone have waterhouse stops for a Newer Dallmeyer 3B?

    Oh, fun. Maybe I should just forget calculations altogether, point it at a light and use a meter on the center of the ground glass to figure out when I've shaved a stop off of each successive size

Similar Threads

  1. Dallmeyer 2B info and looking for flange/waterhouse stops
    By David_5527 in forum Lenses & Lens Accessories
    Replies: 8
    Last Post: 3-Aug-2014, 08:29
  2. Waterhouse stops Dallmeyer 3B
    By andrehh in forum LF DIY (Do It Yourself)
    Replies: 6
    Last Post: 22-Jan-2014, 08:59

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •