On 15 Jan 2004 at 8:05, Kotsinadelis, Peter (Peter) wrote:
>
>
> Willem-Jan Markerink (wrote):
>
>
> Overlooked the rather interesting exposure spec's on
> http://www.irdigital.net/ : 200ASA, 1/[EMAIL PROTECTED]
> (hmm....that's conflicting, with 200ASA SunnySixteen says 1/[EMAIL PROTECTED],
> or almost 1/[EMAIL PROTECTED] cq a true 1/[EMAIL PROTECTED]).
>
> Which means that regardless of whether D30 or D60 *can* record IR,
> there is still a very strong IR-block filter inside....perhaps the
> difference beteen D30 and D60 is in that filter, or in the chip....
>
> ----------------------------------------------------------------------
> -- ------------------ Willem,
>
> Yes and no. The Sunny 16 rule is not foolproof it is merely a guide.
> You need to open up 1/2 to 1 stop to get the shadow detail or shadows
> will be black. Over the years I have found the best way around it is
> to use what I term the modified 11 rule. Here is what I mean. If you
> are set to ISO 200, use the next lower (full) shutter speed 1/125 and
> use F11 as a gauge for a subject that is mostly in the sun. For
> Partial shade open up one more stop. For full shade open up 2 stops.
> So if in shade you would have 1/125 at F5.6 or 1/60 at F8. This
> applies to North America and most of Europe, however, in places like
> Africa and parts of Asia the difference between sun and shade can be 3
> stops. Using this method my exposures are perfect (and I use
> transparency film) 98% of the time. Additionally this does show a
> real exposure would be very close to what is shown in reference to
> your link.
In hindsight this 200 ASA is most likely not an exposure-index, but a
'film-speed' setting on the camera....this categorie of IR-shooters
is not likely to be bothered with external light meters anyway....;))
Btw, one does not shoot IR in (predominantly) shade (or even overcast
weather), and even if: shade under trees is very tricky in the IR-
spectrum, since the leaves not only reflect IR, but also transmit to
the ground (or scatter up and down among themselves).
More than 1 stop difference is rare.
--
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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