Leaves no residue and 2. Is Safe on Plastics, and a precision oiler with oil. Remove the Front and Rear lens cells from the shutter. Remove the front cover of the shutter. DO NOT operate shutter with the front cover removed. Holding the shutter over a suitable collection container trash can with fresh liner or simular flush the shutter gear train thouroghly with the electronic contact cleaner.
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Compur shutters were the world standard for high quality large format lenses. The Compur shutters are still in widespread use. The most popular sizes are 0 and 1. Scroll down this page for a table of sizes. The earliest versions have three blades which open and close to deliver the exposure. The vast majority of these are 0 and 1 size, although there are a few 00 size. Most have no flash synch; these are obsolete, as a practical matter. However since they are of the usual rimset design they look similar to the later versions.
These are also common in the tiny 00 size as well as the 0 and 1. Like the earlier models they use the tension type mainspring. The larger one in the picture is a special version of the same shutter made for Linhof.
It has a new design torsion type mainspring and was originally available in sizes 00, 0, 1 and 3. Battery vendors for the PX 21 can be found via a Google search.. In addition to the usual 00, 0, 1 and 3 sizes there is an elusive size referred to by default as 2.
There are variants and versions that make this a difficult size. These are usually four bladed shutters and exist in both dial set and later as rim set versions. They work more like the Compound shutters but are called Compur and were made thru the late sixties. This size and the 00 size is no longer available and replacement with new shutters is a problem. Repair of these an option which must be considered.
The Compur shutters are nicely made and well designed. They make use of more machined parts and fewer die stampings and therefore were more expensive to make and sell and have a reputation for high quality. The latest versions are perfect in operation and if it were not for their very high price would be popular.
The earlier versions are OK but their performance does not equal their current Japanese made replacements.
Fixing a Sychro-Compur shutter
Synchro-Compur Shutter Repair Manual
Compur Shutter Repair Manual