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Re: [OM] Flash foul-up, what happened?

Subject: Re: [OM] Flash foul-up, what happened?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 03 May 2010 09:32:08 -0400
So, with the 2N and 1N you'd have to use the PC connection as well as 
setting the sync to FP in order to use a flash bulb?

Chuck Norcutt


John Hermanson wrote:
> Only the 2N (and 1N) have constant X sync at the hot shoe regardless of 
> sync switch position, and that is with any flash, not just Ts.  There's 
> a diode in the flash circuit that allows this, though it does prevent 
> some studio flashes from firing.
> 
> Olympus Service made up a small plastic "doohickey" that snaps in behind 
> the sync switch.  It was created for use on UPI ad National Geographic 
> cameras. It holds the switch at X and prevents accidental turning.  I 
> have some of those.
> 
> ________________________________
> John Hermanson  |   CPS, Inc.
> 21 South Ln., Huntington NY 11743
> 631-424-2121  |  www.zuiko.com
> Olympus OM Service since 1977
> Gallery: www.zuiko.com/album/index.html
> 
> 
> Chuck Norcutt wrote:
>> See your OM-2 manual.  If you have a T-flash mounted the camera senses 
>> it and automatically sets X sync regardless of the switch setting.  If 
>> you don't have a T-flash mounted you're responsible to set the sync to 
>> FP or X yourself.
>>
>> Flash bulbs used to be sold in different types.  FP was the type to be 
>> used on cameras that had focal plane shutters.  The characteristic of an 
>> FP bulb was a long burn time.  Since the bulb puts out light 
>> continuously the bulb is able to sync the full range from 1/60 to 
>> 1/1000.  But the manual says not longer than 1/60.  1/60, of course, is 
>> the max for OM cameras on X sync.  But I don't know if you'd get proper 
>> sync for both regardless of sync setting at 1/60.  I think not.  I 
>> suspect the bulb on FP would get lit as soon as the first shutter 
>> curtain started to open.  But that would be a disaster for an X sync 
>> electronic flash.  It would have dumped it's charge completely before 
>> the first curtain got off the starting gate.  That's probably what 
>> happened to you.
>>
>> I've never done it myself but I can recall someone on this list from 
>> many years ago describing some way to lock the sync switch on to X.  It 
>> may have been a tiny dab of contact cement which would be easily 
>> removable if desired.  I just went to take a look at my OM-1's sync 
>> switch to check how it might be done and was a bit startled to find it 
>> setting on FP.  Ooops!
>>
>> Chuck Norcutt
>>
>>
>> usher99@xxxxxxx wrote:
>>> Thanks Chuck, AG, Carlos for thinking about this.   Carlos hit the nail 
>>> on the head. Couldn't be an easier fix but wish the penalty for missing
>>> that hadn't been so high.  Happened once about 5 years ago in Montana 
>>> but I had a T-flash in TTL mode and I think you get a heads-up.
>>> I don't remember exactly but perhaps the shutter is kept open to 
>>> complete the exposure.  I had made a mental note that this could be a 
>>> disaster if happened again but obviously forgot about it.   In manual 
>>> mode there is not a clue anthing is askew.  Not sure how the FP mode 
>>> works , but  I sure won't ever forget to check the switch position. :-(
>>> I really dread picking up this batch but I was told some of the images 
>>> with a potential TOPE shot were interesting.  We'll see.
>>>
>>> Mike
>>>
>>>
>>>
>>>
>>>
>>> Wow!  I don't think I've thought about the X/FP switch since 1976.  :-)
>>>
>>> Chuck Norcutt
>>>
>>>
>>> Carlos J. Santisteban wrote:
>>>> Hi Mike and all,
>>>>
>>>>
>>>>> From: usher99@xxxxxxx
>>>>> Nothing fancy used either.  OM-2 in manual with V283 on a bracket 
>>> with
>>>>> remote cord on the usual yellow for use with F4.
>>>>>
>>>> You mean the 'plain' OM-2 -- not -n, not S? Then it could be the 
>>> position of
>>>> the X/FP switch...
>>>>
>>>> All the best,
-- 
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