Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

  1. #1

    Join Date
    Feb 2008
    Location
    Moscow, Russia
    Posts
    20

    TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    Hello friends,

    Recently and by occasion I've acquired the old brass Taylor Hobson Cooke Anastigmat "Series III" 7 1/2 inches f/6.5 lens. The glass of the lens is in superior condition. In fact I didn't see such clear glasses without any disadvantages. But I can't say the same about the lens barrel which has the faulty aperture: I don't know why it was damaged, because aperture moves smoothly, but several of the leafs are jammed and some of the pivots are missing thus the leafs move incorrectly and don't form the regular circle of the aperture opening. The jammed leafs don't allow to move the aperture freely to the both ends (to fully open and to the f/64), so I could find that the only more or less right aperture opening is at f/11 (although even on this f/11 they form something like irregular figure between the circle and the ellipse).
    I'd like to use this lens on my 1/2 plate camera, but I need to decide what to do with it. After some thoughs I see the following:
    1. Get rid of this lens and find something other in the workable condition.
    2. Use this lens at f/11 only.
    3. Find the same lens with a dead glass (for cheap) but with the working aperture.
    4. Remove the aperture leafs and cut the barrel to make the waterhouse stops.


    I'd like to get your advices to help me to make the right decision. The questions (according to the list above) are:
    1. Is this series of the Cooke lenses worth to use them? I searched this forum and googled the Internet but didn't find any specific, except that Series III lens is intended for the general photography. So I guess they are good common lens without any specific features. Am I right?
    2. Somewhere I read that Cooke Anastigmats are best performers at their closed apertures. f/11 is far from the f/64 available on this lens. So using this lens at f/11 only probably won't give me all the lens could perform, will it?
    3. I don't know if there any good chances to get the same lens (especially with the dead glass) for the affordable price, taking into account the current "boom" prices on the old optics.
    4. This way will restore the full functionality of the lens (at the least 90-95% of it), but will take some precision work and probably some $$. Is it worth to go this way?

    Thanks in advance for your opinions.

  2. #2

    Join Date
    Mar 2002
    Location
    Knoxville, Tennessee
    Posts
    1,789

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    5. Send lens to Carol at Flutot's or Adam at S.K.Grimes and have them fix it.

    Should be about $50-75.

    Cheers,

    Steve

  3. #3

    Join Date
    Feb 2008
    Location
    Moscow, Russia
    Posts
    20

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    Quote Originally Posted by Steve Hamley View Post
    5. Send lens to Carol at Flutot's or Adam at S.K.Grimes and have them fix it.

    Should be about $50-75.

    Cheers,

    Steve
    Thanks for the idea! Unfortunately I'll have to add $40 for the shipping to USA and back. In total it'll cost me $90-115. Plus the cost of the lens itself as I got it $20. In total the lens will cost me $110-135.
    Is it the price of the same lens in the working condition?

  4. #4
    Between here and there
    Join Date
    Sep 1999
    Location
    Sweden & Germany
    Posts
    514

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    I'll give you $25 for the lens.

    Seriously, though: it should be possible to remove the ring that holds the iris with the leaves, giving you a ready-made slot which you can use to insert a waterhouse stop.

  5. #5

    Join Date
    Feb 2008
    Location
    Moscow, Russia
    Posts
    20

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    Quote Originally Posted by Jimi View Post
    I'll give you $25 for the lens.

    Seriously, though: it should be possible to remove the ring that holds the iris with the leaves, giving you a ready-made slot which you can use to insert a waterhouse stop.
    Okay, I'll think on your proposal

    Seriously: how to remove this ring? I disassembled the lens but couldn't find any screws, etc. that let me remove it. From the front of the lens there is the embedded ring which holds the middle glass element. From the back the ring which holds the back lens element looks like the solid piece of the barrel and is smaller than the aperture ring.
    A bit later I'll post here a photos of the lens barrel to show you what I mean.

  6. #6

    Join Date
    Feb 2007
    Location
    Van Buren, Arkansas
    Posts
    1,943

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    I am sure there are "some" qualified camera technicians in Russia, or continental Europe that can repair your lens.

  7. #7

    Join Date
    Aug 2006
    Location
    Milford Pa.
    Posts
    2,923

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    use it the way it is.

    you may not even notice the out-of-round iris. for $20 you can not go wrong.

    let us know how you make out.
    My YouTube Channel has many interesting videos on Soft Focus Lenses and Wood Cameras. Check it out.

    My YouTube videos
    oldstyleportraits.com
    photo.net gallery

  8. #8

    Join Date
    Feb 2008
    Location
    Moscow, Russia
    Posts
    20

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    Here I attached the photos of the lens barrel. I removed all glass cells. The problem is that I don't see any ways how to disassemble the barrel in its middle to remove the iris without breaking it. I can remove the rotating element of the diaphragm from the back with the pliers, but this way will totally destroy it.

  9. #9

    Join Date
    Dec 2000
    Location
    Tonopah, Nevada, USA
    Posts
    6,338

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    It is a very fine lens and you should definitely keep and use it. Typically somewhere in the exterior aperture ring there is a very tiny set screw. If you find it, take the set screw all the way out. Then with a little force CCW try to keep turning the ring after it passes the last number. It is on a thread and you can spin it completely off the lens barrel. When it is out of the way you'll be able to see there is a slot that could be used for waterhouse if the non working parts inside are removed. This is the cheapest solution and since the lens isn't terribly valuable, it makes the best sense. Later if you have a chance to buy an Ilex size 3 American shutter from the 1950's on Ebay, perhaps you can get a machinist to make some adapter bushings to mount the elements in a shutter. Modern shutter would have to be Copal 3 but pretty expensive. I have this lens mounted in the Ilex shutter. It is a wonderful performer and it is not necessary to stop down. It will be very sharp at f8 and f11!

  10. #10

    Join Date
    Feb 2008
    Location
    Moscow, Russia
    Posts
    20

    Re: TT&H Cooke Anastigmat "Series III" lens with the jammed aperture. What to do?

    Jim, what surprises me is that I cannot find any screws on the aperture ring and on the exterior of the barrel on the whole. I guess that the barrel is molded thus it's impossible to disassemle it without any damage.
    I think I'll break out (as the leafs are already damaged) the iris from the back of the barrel and will see what can be done to install the waterhouse stops.

Similar Threads

  1. Trousse Parisienne Casket Lens Set
    By John Downie in forum Lenses & Lens Accessories
    Replies: 13
    Last Post: 14-Jun-2014, 18:32
  2. Cooke Series II -Anastigmat lens-205mm.f4.5-13x18cm
    By Manuel Gomes Teixeira in forum Cameras & Camera Accessories
    Replies: 2
    Last Post: 26-Mar-2004, 08:36
  3. Replies: 11
    Last Post: 2-Jan-2002, 22:22
  4. Schneider 47mmXL coverage test
    By Micah Marty in forum Lenses & Lens Accessories
    Replies: 3
    Last Post: 16-Nov-2000, 12:17
  5. 6x7 Arca, minimum lens aperture question?
    By Robert J Pellegrino in forum Cameras & Camera Accessories
    Replies: 9
    Last Post: 9-Nov-2000, 11:31

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
  •