bj

Thanks Travis, Its the first zoom lens that Im taking apart so not sure how it will end up. Time and patience... ?

Update: So I got the front rim off by using one of those tools you use to change the oil filter on your car ? I also got rid of the vignetting in the corners on the widest focal length. Next is fixing the stiff focus so cleaning and relubing the focus threads I guess.

So I tested the lens today after putting it back together and is was kind of spot on! Might need a shim or two for focus. BUT the focus is a bit stiff so I need to get into the focus part too. Does anyone have a clue how to get the front part of the lens (2nd pic in the first post) of the housing? It looks like its screwed on there but cant get it loose. Hm…

Thanks for the tip James, my zoom had two worn out followers in the zoom group so I made two new bushings out of delrin plastic. The MKI is kind of fun to work on because the lens splits in half and you can work on either the focus or zoom ?

Yes the image shifts when adjusting the zoom and the entire zoom lens group essebly slides about 2mm on the guiding rail when I tilt the lens back and fourth even though Im not touching the zoom barrel. I can zoom the entire zoom range. It produces an ok image in focus.

Thanks for the info Dom, do you think its worth sending it to a lens tech after all? I might put this project on pause then…

Hi, very limited knowledge ? Its a pretty beat up lens so I dont have much to loose… The zoom group (?) of lenses are a bit loose on the guiding rail so I thought Id open her up and have a look.

Update: There is a threaded retaining ring with two slots in it but its blocked by the outer front part of the lens and I cant figure out how to losen it. I guess its screwed on but there are no locking or set screws in it.

Hi Im taking apart this Cooke 25-250 MKI zoom and can't figure out how to take the front element out. There's no threaded retaining ring holding it in place. Has anyone disassembled this lens before? cheers! Björn

Its Sold /Björn

Wollensak Fototel 20" 500mm f6.3 PL-mount mirror lens. Glass looks perfect without any damage. Lens was adapted to PL mount. Front and rear caps. 3/8" lens support socket. Sample pictures are taken with a Sony nex-7 (aps-c) but lens covers full frame cameras. Some scratches and paint loss on the body. Fun lens and not that heavy. $450 Located in Sweden. Please ask for more pictures. cheers Björn Köling

Duclos 11-16mm T2.8 zoom for sale. Used only a few times and shows little to no wear. Great ultra wide zoom for S35. The lens covers full frame 36x24mm sensors at 15mm and 16mm focal length. 80mm front. front and rear caps and case. Located in Sweden. $1000. Duclos sold them for $2800 when introduced.

Lens is now sold

Im still looking for someone to confirm that all codecs work the same when in pixel-to-pixel mode.