mr blackstock
Joined: 25 Jul 2018
Posts: 5
Location: Ararat, Victoria, Australia
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 Posted: Fri Jul 27, 2018 2:24 am Post subject: Pentacon Pentovar variable focal length lens repair |
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mr blackstock wrote:
Hello,
I am hoping one of you have a little experience with a Pentovar 15-60mm F2.8/30-120mm F5.6 ZOOM lens. The mount is for a Pentaflex AK16mm cine camera.
The shutter/aperture blades are essentially jammed, not stiff or gunked up, just plain old jammed. If I attempt to force it, I can see the blades buckling under the pressure. So, lacking any online resource about the Pentovar, or affordable local specialist, I decided to attempt the repair myself.
While I have a wee bit of experience tinkering with cameras, and one Canon Super8 1218 lens, I have hit an obstacle with the Pentovar lens. Having removed the lenses I can, the one sitting atop the aperture blades I cannot see how to remove. I was hoping people could have a look and perhaps suggest a way of tackling the issue.
There is a small screw deep in the body of the lens, when I undo it, the small lens does not move, the screw has a pole on it's end, presumably to stop something turning. There are no other screws for me to try.
I have attached some pics of the lens but they are not showing up in the post. Odd
Cheers, Gareth
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visualopsins
Joined: 05 Mar 2009
Posts: 11067
Location: California
Expire: 2025-04-11
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| Posted: Fri Jul 27, 2018 3:57 am Post subject: Re: Pentacon Pentovar variable focal length lens repair |
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visualopsins wrote:
| mr blackstock wrote: |
Hello,
I am hoping one of you have a little experience with a Pentovar 15-60mm F2.8/30-120mm F5.6 ZOOM lens. The mount is for a Pentaflex AK16mm cine camera.
The shutter/aperture blades are essentially jammed, not stiff or gunked up, just plain old jammed. If I attempt to force it, I can see the blades buckling under the pressure. So, lacking any online resource about the Pentovar, or affordable local specialist, I decided to attempt the repair myself.
While I have a wee bit of experience tinkering with cameras, and one Canon Super8 1218 lens, I have hit an obstacle with the Pentovar lens. Having removed the lenses I can, the one sitting atop the aperture blades I cannot see how to remove. I was hoping people could have a look and perhaps suggest a way of tackling the issue.
There is a small screw deep in the body of the lens, when I undo it, the small lens does not move, the screw has a pole on it's end, presumably to stop something turning. There are no other screws for me to try.
I have attached some pics of the lens but they are not showing up in the post. Odd
Cheers, Gareth
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Welcome mr blackstock
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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