what is the difference between copal and compur shutter?

I'm a beginner in LF, I'd like to know the difference between copal

and compur shutter. Thank for the response.

One goes "Kerchick" and the other goes "Kerchack". ;-)<p>That was the short answer, now for the longer version:<br>Older Compurs, pre 1975 or thereabouts, were suberbly made shutters that will probably work forever. They had a few design quirks that made them sometimes frustrating to work with. Like having a silly little preview lever that had to be operated with a fingernail, and the fact that the shutter would quite happily fire from the preview position. (Caught out by that one a few times too many!)<p>I've just serviced a couple of early Deckel Compurs dating from the 1920s, and after an internal clean, they're fully functional again after nearly 80 years!. Most later Synchro-Compurs are just as reliable IME.<p>Compur, however, couldn't leave well alone. They revamped their shutters in the mid 1970s to have better ergonomics, but at the same time the build quality went right down, and after that they went further steadily downhill and they're now, quite deservedly in my opinion, out of business.<br>I doubt that many post ~1975 Compur shutters are accurate or reliable today.<p>Copal, OTOH, got it right almost from the start. Their shutters are well-designed and reliable. They don't sound quite as 'sweet' as an early Compur, but in my experience they're far more reliable and accurate than a late model Compur

Copal shutters are made in Japan. Compur shutters, made in Germany.

Compur, a division of Prontor Werke - part of the Zeiss group - was the shutter

that Linhof invented before he made cameras. He and his partner Deckel split

and the shutter went from the Linhof shutter to being the Deckel shutter.

Deckel became part of Zeiss and the shutter was renamed Compur.

 

Modern Compur shutters differ from Copal shutters in that the 1 and 3

Compurs had 1/3rd step click stops and the 0 hed 1/2 stops click stops.

These shutters could also be set with an accessory from behind the lens

(aperture).

 

The Copal shutters do not have click stops and can not be set from behind the

camera.

 

As far as accuracy, repeatability, robustness, etc. a maodern Compur and a

modern Copal are roughly the same.

 

About 10 years ago the Zeiss group drastically increased the price of all large

format camera shutters from Prontor Werke and with that the sale of Compur/

Prontor large format camera shutters rapidly declined as Copal held their

prices for several years. Today the Zeiss group has discontinued the

manufacure of all Compur, Prontor Professional, Prontor Press shutters and

only the Prontor Magnetic shutter is available for some camera and lens

manufacturers to modify into use on a large format camera for shorter lenses.

 

The other choiuce of a shutter which is becoming quite common for use on

large format cameras with some digital backs is the Rollei Linear Motor

Shutter System.

 

The older Compur and shutters were called Synchro Compur and had X/M/V

selector for flash and self timer. Shutters of this vintage from Copal had a habit

of losing slow speed accuracy from not being used frequently. The big benefit

Copal offered at that time was they did not have this problem.

and then there's the synchro compur 00 . . . .

Compur 1 shutter can go to 1/500 sec, whereas Copal 1 to 1/400 sec; Compur 3 shutter can go to 1/200 sec, whereas Copal 3 to 1/125 sec.

Compur 1 and 3 do not have T, whereas Copal 1 and 3 have T.