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

"Richard Knoppow" <dickburk@[EMAIL PROTECTED]
> wrote in message 
news:13sfg5amptadv36@[EMAIL PROTECTED]
>
> <jjs> wrote in message news:13seve6aqb88of8@[EMAIL PROTECTED]
>>
>> "Richard Knoppow" <dickburk@[EMAIL PROTECTED]
> wrote in message 
>> news:13serbt1qjvdl5c@[EMAIL PROTECTED]
>>
>>>     Just never fire a bulb off in your face... YIKES!!
>>>     I agree about using solenoids for remote tripping. Silent and no 
>>> limit on distance. Some shutters, particularly the Kodak Supermatic
and 
>>> Flash Supermatic, will not trip at 1/400 with just two batteries and 
>>> sometimes not with three. This was a problem in the old days and 
>>> extra-high-voltage photoflash batteries were made for just this
purpose.
>>
>> Yup! I know. Radio-Shack, still offer the old 22.5V batteries that
those 
>> units used. This link shows a camera that used the same.
>> http://www.digoliardi.net/ks6/
>>
>> I had that set since 1968, and later sold that for a bloody fortune. 
>> Sometimes life it good. :)
>>
>    The 22.5V batteries were used in several BC type flashguns including 
> one of the Rolleiflash units. I don't think they were ever used for 
> solenoid flash. The "high voltage" batteries I was talking about were 
> standard Size-D cells with something special about the mix. They were 
> enough higher than the standard 1.5V so that three of them in a standard

> flashgun would have enough extra oomph to deal with hard to trip
shutters. 
> I don't think these have been made for decades. I don't know what was
done 
> to them to increase the voltage but they had a reputation for having
short 
> life.
>    When Wollensak came out with the Rapax shutter it was designed to 
> eliminate this problem by having a constant and relatively low "trigger 
> pull" at all speeds. Although Wollensak made some flakey lenses their 
> shutters were always excellent.
>
>
Begging your pardon, Richard, but I think a solenoid would require high 
current (amperes), while a flash bulb would require votage. I'd venture to

guess that a couple of old-style 1.5V dry cells (about 2" diameter and 6" 
high with screw cap connections, originally used as "talk batteries" in 
telephone systems) would pull in most solenoids. Generally with batteries,

size/bulk equals current. The larger the cell, the more current it can 
source, generally.

How big a solenoid would it take to trip the old wind-up focal plane 
shutters in the press cameras?! (The shutter curtain had four different
size 
slits and the was a tension setting to control how fast the slit moved.)