Abstract art with the DC260. :-)

[Steve Haehnichen]

In preparation for the 4th, I thought I'd try some 4-second exposures.
Check this out!

http://www.trix.com/dc260/samples/P0000380.JPG

Made in 4-seconds with a white wall and a red laser pointer. :-)

The flecks of white in the background seem to be normal for the long
exposures. (They look like stars in space for this shot.. perfect!)
That might be why they don't let us use the whole 16 seconds that the
camera can do with Digita script extensions.

-Steve

Steve Haehnichen
st...@vigra.com

[Gregory Benjamin]

This is a *very* interesting picture when you start
looking at it. A RED laser pointer is pretty close
to monochromatic (cheap ones around 670nm, the best around 635nm),
yet this picture shows magenta, red, and
white coloration. Note that the starfield of white noise
dots also contains a large number of red and some blue, but
very few green dots. This sort of photo could help us understand
what sort of image processing is going on.

Steve: I have a green HeNe laser if you want to play...

Steve Haehnichen wrote in message ...

[Michael Lynch]

Steve Haehnichen wrote in message ...
>In preparation for the 4th, I thought I'd try some 4-second exposures.
>Check this out!
>
> http://www.trix.com/dc260/samples/P0000380.JPG
>
>Made in 4-seconds with a white wall and a red laser pointer. :-)
>
>The flecks of white in the background seem to be normal for the long
>exposures. (They look like stars in space for this shot.. perfect!)
>That might be why they don't let us use the whole 16 seconds that the
>camera can do with Digita script extensions.
>

I've noticed these speckles on almost all the 260's long exposure shots I
have seen. They seem to be what stands out most in the photos. Was the
DC-120 as bad in this regard? (I've seen a few 120 long-exposure shots
without the speckles, but don't know if they were edited out).

I was thinking that the 260's long exposure might be useful, but if it
lights up like this, I wouldn't use it much. If four seconds looks like a
bright starry night, I would imagine sixteen seconds would look like a
Christmas tree. (Again, this could just come with the turf.)

-Mike Lynch
=====================================
mly...@ctaz.com
Digital Camera Page:
http://www.ctaz.com/~mlynch
=====================================

[Ewald R. de Wit]

Gregory Benjamin wrote:
>This is a *very* interesting picture when you start
>looking at it. A RED laser pointer is pretty close
>to monochromatic (cheap ones around 670nm, the best around 635nm),
>yet this picture shows magenta, red, and
>white coloration.

That's probably due to spilling over of charge from the red pixels to
the others ("blooming"). Blue pixels get a lot more excess charge than
the green pixels. Possibly the green pixels have better anti-blooming
structures.

>Note that the starfield of white noise
>dots also contains a large number of red and some blue, but
>very few green dots. This sort of photo could help us understand
>what sort of image processing is going on.

The shotnoise is very peculiar indeed but not likely to be related
to the sort of processing involved. What strikes me is how random
it is distributed. It sort of looks like Steve was standing next to a
nuclear reactor! It would be interesting to know if this 'starfield' is
always the same - that would implicate CCD defects/imperfections.

>Steve: I have a green HeNe laser if you want to play...

Don't you mean argon.. helium neon is red

--
-- Ewald