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[OM] Re: Shutter speed requirements [was: 3x21 tele converter]

Subject: [OM] Re: Shutter speed requirements [was: 3x21 tele converter]
From: "Scott Peden" <scotpeden@xxxxxxxxxx>
Date: Tue, 27 Feb 2007 22:55:40 -0800
AND, Moose and I were talking about Hawks sitting in the top of a tree, if
the tree is moving fast enough I have to pan it, I'm getting the hell to
some place safe.

 I still vividly recall the trees falling over the cliff at the edge of our
school yard during the Alaskan quake, though where I was it was only 8.2 and
43 seconds long........

And I'd rather do that again than a tornado.

-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Jan Steinman
Sent: Tuesday, February 27, 2007 10:40 PM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Shutter speed requirements [was: 3x21 tele converter]


> 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?



:::: The record is clear that left to their own devices, the  
automobile manufacturers lack the wisdom or the will or both to  
switch decisively to the production of inexpensive, compact, energy- 
saving cars appropriate to our present needs. -- Donald E. Weeden,  
1975 ::::
:::: Jan Steinman http://www.VeggieVanGogh.com ::::



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