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From: Abandoned Trolley <fred@fred-smith.co.uk>
Newsgroups: rec.photo.digital
Subject: Re: Catch a bullet in flight? 1/8000
Date: Sun, 28 Jul 2024 16:21:41 +0100
Organization: A noiseless patient Spider
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On 28/07/2024 16:03, Alan Browne wrote:
> On 2024-07-28 04:11, Abandoned Trolley wrote:
>> On 26/07/2024 01:03, miked wrote:
>>> On Thu, 25 Jul 2024 19:48:59 +0000, Arcanauta wrote:
>>>
>>>> Il 25/07/2024 20:04, Alan Browne ha scritto:
>>>>> On 2024-07-24 20:06, Geoff wrote:
>>>>>> On 24/07/2024 7:45 pm, Abandoned Trolley wrote:
>>>>>>> On 14/07/2024 22:53, Geoff wrote:
>>>>>>>> On 15/07/2024 12:41 am, Alan Browne wrote:
>>>>>>>>>
>>>>>>>>> https://www.nytimes.com/2024/07/14/us/politics/photo-path-trump-assassination.html?unlocked_article_code=1.7E0.iSuZ.18TjxlOqrmN6&smid=url-share
>>>>>>>>>
>>>>>>>>> << Photo Appears to Capture Path of Bullet Used in Assassination
>>>>>>>>> Attempt
>>>>>>>>> Michael Harrigan, a retired F.B.I. special agent, said the image
>>>>>>>>> captured by Doug Mills, a New York Times photographer, seems to
>>>>>>>>> show a bullet streaking past former President Donald J. Trump. >>
> 
> <<S>>
> 
>> Am I the only person in here who is wondering why a "professional" 
>> photographer would be shooting a practically static subject at 
>> 1/8000th of a second ?
> 
> Why not?  He's shooting free hand at a subject that is gesticulating[1] 
> and moving behind the lectern.   Plus the photog is moving around a lot 
> and need to compensate for that too.
> 
> Wants a fairly good DOF as well.
> 
>> Apart from the shutter speed and the fact that it was a "Sony" camera, 
>> the article does seem a bit short on technical detail - its quite 
>> remarkable that theres no mention of the lens aperture or the ASA rating.
> 
> ASA?  <derisive snicker>
> 
>> I just tried my Canon DSLR at 1/8000th in bright daylight, and to get 
>> a reasonable exposure I needed to set the camera for 16,000 ASA - you 
>> can imagine what the image quality was like.
> 
> Funny for someone going on about technical detail that you didn't 
> mention the aperture.
> 
> Let's see, some basic exposure math based on old-school sunny-16:
> 
> ISO 100 - 1/125 - f/16
> 
> Leave it at f/16 you're only 6 stops to 1/8000 <-> ISO 6400.
> 
> IOW, no big deal with today's sensors, noise-wise.
> 
> And if you trade that 6400 to 3200 and open up to f/11 - still decent 
> DOF and less noise again.
> 
> Keep trading f/8 (bottom of the sweet spot, decent DOF) ISO 1600. Little 
> noise with today's sensor.
> 
> For the above I used sunny-16 as a rule - but could easily play 1 stop 
> either way depending on the camera used (sensor).
> 
> ASA?  ROFL.
> 
> [1] https://youtu.be/QAxfBHelonw
> 
> 

Sorry - I didnt realise I was "going on"