canislupus wrote:
> ... talk about extreme situations. Here are folks who (like me;)
> try to push the MOST speed off a film, to put MOST TCs on a lens
> (was it someone's 64/4800mm rig? the UFO=flare shot last year ;)
that was me - I admit! "6400mm, guilty as charged" :^D
> 2) flash but unobtrusive - IR
I haven't used these, but you want the flash head that outputs
IR light. From discussions on the IRList, the E6 film isn't all
that great for this & will be badly distorted after a few shots
from the heat - if you try it, have plenty on hand.
> Film to use, and its development? (B&W IR)
the "real thing" Kodak HIE b&w - the SFX is just a rather extended
red response film.
> Filter over the lens? Won't it lose too much light?
if you shoot by IR illumination in minimal normal lighting, no
filter will be needed on the lens, as alluded to earlier.
> Will the TTL metering work well?
your IR source will be constant, so manual exposure after a
determination would be sufficient.
> Perhaps I should use Manual flash setting - but is there any easy way to
> figure the IR Guidenumber without having to run a full roll of film at same
> aperture and changing flash->subject distance and picking the best shots?
the Kodak insert (probably on website, as well) gives flash guide
numbers for various BCPS ratings, which are not exactly enough
the same for an "easy" comparison. some experimentation would probably
be good to determine where your flash falls in the chart. It mentions
use of a #87 on the lens, but this is to eliminate any ambient light
which your darkness circumstances seem to make rather unnecessary.
Bill
---------------------------------------------------------
Bill D. Casselberry ; Photography on the Oregon Coast
http://www.orednet.org/~bcasselb
[EMAIL PROTECTED]
---------------------------------------------------------
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org.
