Re: [OM] shutter speed

[Chuck Norcutt]

I knew somebody would come up with a refined answer. :-)

Chuck Norcutt


Piers Hemy wrote:
> Inspection of the image shows blurred specular highlights on the mortar
> round.  Measurement of the blurred highlights shows they have length 63% of
> the width of the round.  Since we know that this is a 60mm round, we can
> deduce that the round travelled 38mm (1.5 inches) during the exposure. 
> 
> Based on Chuck's muzzle velocity speed (it's as good as anything!) of 500
> fps (6000 inches per sec) I believe the shutter speed was 1.5/6000 seconds,
> which is 1/4000 sec.
> 
> Piers
> 
> -----Original Message-----
> From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx] 
> Sent: 21 December 2009 01:13
> To: Olympus Camera Discussion
> Subject: Re: [OM] shutter speed
> 
> Googling 60mm mortar muzzle velocity returns number between 439 and 550 feet
> per second.  Let's choose 500 fps for a nice round number.  It looks to me
> like the projectile is about 1 foot out of the tube so it started emerging
> from the tube 1/500 second ago.  So I'll guess 1/1000 of a second shutter
> speed which would allow it to traverse half it's length during the exposure.
> 
> Chuck Norcutt
> 
> 
> John Hudson wrote:
>> Is there any opinion on the likely shutter speed of this snapshot ?
>>
>> http://tinyurl.com/y9or7zs
>>
>> jah
>>
>>
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