RE: Autofocus lenses for IR?

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 21 Jan 99 at 15:14, Rolland Elliott wrote:

> I'm sure one of the reasons no one sees lots of action  IR images with
> shallow depth of field is because of the inherent problems of focusing
> IR light accurately and quickly with the shallow depth of field
> associated with long telephoto lenses usually used for action
> photography.

Note that high-end tele's are more likely to be IR-corrected than 
normal focal lengths, hence the argument is less valid....;-))

(not that action necessarily means tele, and you are walking into
marginal light conditions anyway with #87C (= 12 ASA = 1/400s@xxxx
on a bright sunny day))




--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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