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135mm Optar Lens

 
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flashbulbman



Joined: 29 Jan 2009
Posts: 51
Location: California

PostPosted: Fri Dec 04, 2009 6:27 pm    Post subject: 135mm Optar Lens Reply with quote

I just replaced my 127 Ektar with a 135 Optar in a Graphex shutter.

I know that the black letter M and the red letter M are for settings when using certain shutter speeds with flashbulbs.

However, there is a F.X setting, the F is red and X is black. I assume this is for electronic flash sync, but what does the red F stand for?

Also, there is an OFF position. What happens to X sync if OFF position is used? Does it still work with electronic flash in OFF position?

What is the reason for the OFF position and what effect does it have on sync speed or flash choice? Thank you.
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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Fri Dec 04, 2009 7:24 pm    Post subject: Reply with quote

I think the F is for SM type gas filled, short duration flash bulbs. Never tested the "off" position.
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Henry



Joined: 09 May 2001
Posts: 1446
Location: Allentown, Pennsylvania

PostPosted: Fri Dec 04, 2009 8:19 pm    Post subject: Reply with quote

"Off" means just what it says: off. IOW, the synch gear train is disengaged, (theoretically) saving wear and tear on it. Also, there should be no contact for an electrical path through the shutter. If the synchronizer is out of adjustment, you may get contact in the "off" position, but it shouldn't otherwise affect the operation of the shutter. That's been my experience with Graphex shutters, at any rate.
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flashbulbman



Joined: 29 Jan 2009
Posts: 51
Location: California

PostPosted: Sat Dec 05, 2009 12:29 am    Post subject: Reply with quote

Thank you gentlemen.
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Sat Dec 05, 2009 12:32 am    Post subject: Reply with quote

The F is for fast peak bulbs, i.e. the Speed Midget gas filled bulbs. It should provide roughly a 5 millisecond delay.
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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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