Very strange shutter. Comparing it to a Copal 1 shutter it is quite strange.
This Prontor shutter has two cable release inlets: one, for apparently
opening the lens for focusing, and the other one to actually fire the shutter.
My only cable release has a very short tip when I press it. It is not useful
with any of the large format lenses that I use. It does however work with
other camera formats, but not with large format lenses.
Due to this, when I need to focus this lens that has this Prontor 1 shutter,
I have to put the speed on 'B', (bulb), and set the diaphragm to the widest
aperture, (f/5.6). After I have focused, I set the lens to the desired, or
optimal - if you will, speed and diaphragm conbination.
It is not only strange, but a bit cumbersome to use this Prontur 1 shutter.
Have you used this kind of shutter? Do you know if one needs a special cable
release for this Prontor 1 shutter?
The thing is, that there may be a bit of shake when taking a photo, because
to release the shutter, one actually has to pull down a lever.
The Prontor Professional was the most expensive manual shutter and is self-cocking. There is s specific shutter release (or better: remote control). You can use it not only to release the shutter but also to switch between open aperture (for focusing) and working aperture. There was also a speed time and aperture device. In this combination the lens can be fully operated when standing behind the camera.
However, you could also use two separate shutter releases to work with. One is to release the shutter, the other to open the aperture for focusing.
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