I’ve had luck getting sticky shutters going again by squirting some lighter fluid in the shutter and then working the mechanism. I take the lens elements out first.
I’ve had luck getting sticky shutters going again by squirting some lighter fluid in the shutter and then working the mechanism. I take the lens elements out first.
Keith Pitman
Well....if your shutter has "B", you could use a locking cable release.
freeze it. the metal will contract n the cell should unscrew... it sometimes takes a bit of muscle.
be sure to turn it counter clock wise?
I have serviced large format lenses professionally in the past. For the occasional stuck lens cell I use thick rubber grip gloves. These give me good purchase on the shutter body as well as the cell. I take care to apply only radial force and not tilt the lens cell at all.
In the rare situation where this fails, I use a very thin penetrating oil applied sparingly around the base of the cell. A mixture of 50/50 Isopropyl alcohol - pure not rubbing - and Super Lube spray is an excellent penetrating oil for for fine lens threads. Most penetrating fluids are simply too thick to work well for lens threads. I try again after a couple of days with the gloves. That almost always works. If that fails I grip the lens cell, with thin rubber padding around it firmly in a high precision 6 jaw chuck in my lathe. Then I unscrew the shutter body with grip gloves. I've only had to resort to the lathe a couple of times. Some caution is requires as the shutter body is held together with tiny screws and it would be quite possible to twist it apart.
Hope you succeed.
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