> From: Dan Mitchell <danmitchell@xxxxxxxx>
>
> Moose wrote:
>> [1/lens-length rule of thumb]
>>
>> Third, the rule of thumb assumes an unmoving subject, which is not
>> true
>> of most critters. And even if you shoot a wooden decoy at the top
>> of a
>> tall tree, the tree is always moving, more or less, depending on
>> weather
>> conditions.
>
> I'm not sure I follow this step. Sure, static subjects are easier to
> shoot then moving ones, but how does one factor lens length come
> into it?
I agree, Dan. Subject motion relative to the frame is the key metric.
The only reason "1/f" works at all is because frame-relative subject
motion is less *from the same spot* for a wide angle lens than it is
for a telephoto.
If you have a tele on an ideal tripod, 1/f is irrelevant, no?
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