Re: Zeiss Ikonta Shutter - Rapid and Synchro - both have flash?

<jjs> wrote in message 
news:13sdphdcv7h6695@[EMAIL PROTECTED]
> "Richard Knoppow" <dickburk@[EMAIL PROTECTED]
> wrote in 
> message news:13scv6snfi59426@[EMAIL PROTECTED]
>
>>    Somewhere I found a site illustrating all the Deckel 
>> shutters with dates.
>
> Deckel - that's a good lead. I will try to surf out the 
> information.
>
> Mine has a Compur Rapid. Where the eBay camera has a flash 
> synch, is exactly where the cable release is on mine.
    That may be a modified shutter. Its relatively easy to 
modify any of the old Compur or the Compound for X synch. 
The tech doing it may have decided it was simpler to 
sacrifice the cable release socket than to drill a new hole 
for the connector.
    Most shutters with built-in flash synch were made after 
1945. Before that it was usual to use some form of solenoid. 
Most were mounted externally but some Ilex shutters had a 
second cable release socket for a screw-in solenoid.
    The first Compur shutters with built-in synch were X 
synch (flash is fired just as the shutter reaches maximum 
opening) because that is very easy to do. All one needs is a 
contact post mounted on the blade driving ring. For 
flashbulbs the shutter opening must be delayed long enough 
to allow the bulb to come up to maximum brightness. That is 
usually doen with a clock-work delay in the shutter, often a 
modified version of the time-delay mechanism (as it was in 
the Kodak Flash Supermatic). This is actually also how the 
solenoid works. The solenoid is energized when the bulb is 
flashed but the magnetic and mechanical delay is set so that 
the shutter tripping is delayed just enough to allow the 
bulb to get started. Ilex made the first shutters with 
built-in synch.
    Kodak and Ilex shutters required that the delay 
mechanism be cocked separately from the shutter, Compur and 
Wollensak cocked both from the same lever.
    Many people having Kodak Flash Supermatic shutters do 
not realize that they are also X synch. There are two sets 
of contacts in the shutter, one on the blade ring, the other 
operated when the shutter delay mechanism is tripped. For X 
synch the synchronizer is simply not cocked so the first set 
of contacts never closes. The X synch contact has a 
relatively high resistance in series with it so it can't 
fire flash bulbs. This is done so that bulbs won't be 
inadvertently fired when setting up.


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Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]