"30 second camera limit"? Just go to Bulb and hold the shutter open
as long as you need.
Godfrey
On Sep 1, 2005, at 7:43 AM, danilo wrote:
well, don't expect it to be *so* sensitive,
you usually have to overexpose a lot (5/6 steps, but YMMV) from what
the meter says _with the filter on_ (which already *eats* all the
light)
I have no digital pentax-es, but with my DSRL (enemy-branded), in a
sunny day, the tipical exposure, at 100 Iso should be
f/8 10-15 secs.
not joking
sometimes I have to boost up the ISO just to keep the time below the
30 secs camera limit (when the sun is not so present).
of course I usually boost up the ISO, at least 400 / 800.
even so, times will be atound 2/4 seconds...
After 800 you are going to have a lot of grains, which, in an IR shot,
may be welcome.
btw, I usually use this post-processing workflow
- open up your preferred image editor (for a war on this question, and
other computer related things, please go to the right threads)
- split the image into the three channel (RBG)
- use just the GREEN one (and this is one point I suppose change
between cameras)
- adjust it, tipically adding contrast/brightness and levelling it
cutting out all the "non-exposed" part of the histogram (if it makes
any sense)
I've tried to use curves instead of levels+contrast/brightness (which
I prefer for color images, curves, that is), but the results were very
similiar, except that it was more painfull with curves.
danilo
