Following the previous article and questions ensuing, I felt this earlier (read: probably forgotten) post would be a good explanation of just how much of a grey area the whole idea of a ‘decisive moment’ is…

A photograph is an observation of a scene at a given moment in time. It’s an effectively instantaneous snapshot of the state of a scene or person or other subject, given the relative rate of change of those subjects. If we extend the duration of observation – i.e. with a long shutter speed – we might see some hints at that change in the form of motion blur, or eventually, averaging. If we get lucky, or observe for a long period of time, we might eventually be able to capture an interesting change or temporary state of the system; however, this assumes two further things. Firstly, that we can differentiate what is ‘interesting’ and have a good benchmark of what to look for; secondly, that we are aware and responsive enough to capture it. I think we can already see why there are some serious challenges here.

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A photograph is an observation of a scene at a given moment in time. It’s an effectively instantaneous snapshot of the state of a scene or person or other subject, given the relative rate of change of those subjects. If we extend the duration of observation – i.e. with a long shutter speed – we might see some hints at that change in the form of motion blur, or eventually, averaging. If we get lucky, or observe for a long period of time, we might eventually be able to capture an interesting change or temporary state of the system; however, this assumes two further things. Firstly, that we can differentiate what is ‘interesting’ and have a good benchmark of what to look for; secondly, that we are aware and responsive enough to capture it. I think we can already see why there are some serious challenges here.

[Read more…]