Using Calumet shutter tester with 120 folders

I have a number of 120 folders, two Super Dolly, two Perkeo, two Welta, and I want to test the accuracy of the shutters. I've done my large format lenses and Speed graphics and need advice on how to test the speeds on the folders. I can't remove the shutters from the cameras so the testing has to be done with the folder open. The folder configuration is not mentioned in the manual.

Any advice on how to proceed would be appreciated.

It's really the same kind of setup, I don't know if the Calumet requires taking the elements
off the shutter, If it does the only (not very) difficult bit is removing the rear element.
I wouldn't bother extending the bellows unless it has a tripping mechanism that needs it.

You may want to use a mask with a hole in it for the lens/shutter to cover the film plane
while you're testing........ Or not.

It is no different than testing a LF shutter. Just open the back with the lens pointed at a strong light source. Open the diaphragm as far as possible. Hold the tester against the rear of the camera, or even slightly inside if the camera is large enough, and run the tester as usual.

hi bkarasek

did you download the instructions for the shutter speed tested
i posted for you in the other thread ?

best of luck figuring out your speeds !
john