Home
SearchSearch MemberlistMemberlist RegisterRegister ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

Pentacon Pentovar variable focal length lens repair
View previous topic :: View next topic  


PostPosted: Fri Jul 27, 2018 2:24 am    Post subject: Pentacon Pentovar variable focal length lens repair Reply with quote

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


PostPosted: Fri Jul 27, 2018 3:57 am    Post subject: Re: Pentacon Pentovar variable focal length lens repair Reply with quote

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


Welcome mr blackstock


PostPosted: Fri Jul 27, 2018 6:14 am    Post subject: Reply with quote

Hello,

Thanks for the re-post. I went and re-activated an old flicker account so I could post some better quality pics. Hopefully these work..

IMG_20180727_160659 by mr blackstock, on Flickr

IMG_20180727_160643 by mr blackstock, on Flickr