LUC SHUTTER

[david_blum]

Hi ,

 

I have purchased an old LUC shutter which will be suitable for my

barrel lenses.

 

It has three operating modes: O - which is constant open

M - which has a specific speed

Z - which is like B

 

Do any one know what is the speed in M mode?

 

Thanks,

David Blum

[light-zone]

The M shoiuld be around 1/15th of a second, but you'll soon see that the speed will certainly vary, depend on how you press the cable release...meaning slow with feeling or faster with reckless abandon.

 

I've found the LUC shutter to be best when used in the T and B modes. Atleast that way you can be relatively certain of your exposure time.

[s.k. grimes inc]

In this case the letter M is the first letter of the German word "moment" for "instantaneous" (not the same as the letter M used in flash synchronization) <p>

As a practical matter, a LUC shutter in good condition will deliver about 1/25 second at this setting for the small sized shutters and about 1/10 on the large sized ones. <p>

Also the instantaneous speed may vary depending on the punch you apply to the release bulb. Use the same consistent touch to get the speed to repeat. Compare by eye the speed of the LUC shutter with that of a known good ordinary shutter with variable instantaneous speeds. Speeds of 1/50 thru 1/8 can easily be compared by eye with a known good shutter.