Re: winter landscape in IR

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

On  9 Nov 99 at 10:43, pete wrote:

> >The only thing I have in my mind for HIE & #87C is: 1/60s @ f5.6-f11.
> >Any deviation starts from there (#25 is two stops minus, telelens is
> >two stops shift, late afternoon is 2 stops plus).
> 
> What was that adjustment for the tele lens again? Do you have 
> problems with images being out of focus, due to the reduced depth of 
> field with tele lenses?

No, simply two stops shift to reach 1/250s @ f2.8-f5.6 (200mm lens).

But yes, focus does get problematic....there are a few high-end IR-corrected 
tele's on the market (the better APO's), but not for EOS, and 
definately not in the most compact category (a 200/2.8 can be stored 
upright in a LowePro PhotoTrekker, anything larger (or zoom) can't.

Most sad detail is that Canon's Image Stabilisation would be a nice 
(albeit not perfect) solution for this....those two additional stops 
in 'handheldability' would allow stopping down to 1/60s @ f5.6-11, 
but until now there hasn't been a solution in 200mm (300/4 IS is 
effectively just as slow, 100-400/4.5-5.6 idem, and 300/2.8 is too 
large & heavy). 
And with 'not perfect' I mean that stopping down and a large range of 
focus is not always wanted....especially with the overall 
blur/fuzziness of HIE a snap focus against a blurred background gives 
a nice extra visual 'kick'.

--                 
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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