On 9 Feb 2007 at 22:48, Austin Franklin wrote:
> Hi Millen-Jan,
>
> > Remember that you gain 3 or 4 stops by now, with the latest IS-
> > technology.
>
> For the longer focal length lenses, sure...but for something this short?
> I'm not sure you'll gain anything, if at best 1 stop at 70. We'll just have
> to wait and see!
Why would IS be less effective at smaller focal lengths?
Or: why would the normal 'steady' rule of thumb be 1/focal-length, in
(fraction of) seconds?
It's just a matter of geometry: same vibration *angle*, lower
magnification.
Hence the threshold of a 200mm lens becomes 1/12.5s, and 20mm
1/1,25s....:))
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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