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Re: [OM] shutter speed

Subject: Re: [OM] shutter speed
From: Rand E <rtomcala@xxxxxxxxxxx>
Date: Tue, 22 Dec 2009 10:01:08 -0500
Upon further research:


  M224 mortar -This smooth-bore system can be gravity-fired or fired by
  using a manual spring-loaded firing system.

i.e., nothing electrical


Rand E wrote:
> I don't think that mortars have anything other than a fixed firing pin 
> at the bottom of the tube.  Nothing like a trigger mechanism, just a 
> fixed pin.
> If not a high speed camera, I think that it would take a lot of luck and 
> many expensive mortar rounds expended the get this shot just right.
>
> Mark Marr-Lyon wrote:
>   
>> I would guess that the shutter lag of whatever camera was used would
>> be too slow to trigger off the mortar round firing.  The picture was
>> likely taken only a few milliseconds after the mortar was triggered,
>> so you would have to pre-trigger the camera to catch the round.  For
>> this picture, I would also guess that the operators of the mortar
>> would not be willing and/or able to attach some sort of timing device
>> to trigger the camera at the proper time.  If it were me taking the
>> picture, my first try would be to get as high of a shutter speed as I
>> could, set the motor drive as fast as it will go, start shooting when
>> they either drop the round in the tube or are about to pull the
>> trigger, and hope.
>>
>> Mark
>>
>> On Tue, Dec 22, 2009 at 6:03 AM, John Hudson <OM4T@xxxxxxxxxxx> wrote:
>>   
>>     
>>> Assuming that the camera was a film camera I think it is doubtful that the
>>> photographer used his finger to trigger the shutter! The chances of getting
>>> the image just right as the projectile left the firing tube would be
>>> incredibly long odds.
>>>
>>> Isn't it more likely that there were a sound or light activated trigger
>>> mechanism attached to the camera ?
>>>
>>> jh
>>>     
>>>     
>>>       
>>> ------------------------------------------------------------------------
>>>
>>>
>>>
>>>       
-- 
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