Canon TC-80N3 Timer Remote Controller + 5D - take multiple exposures on a single frame?

paro wrote:
Does anyone know if the Canon TC-80N3 Timer Remote Controller when used with a
5D would allow one to take multiple exposures on a single frame?

No, it doesn't provide that functionality.

--
Derek Fountain on the web at http://www.derekfountain.org/

Derek Fountain wrote:
paro wrote:
Does anyone know if the Canon TC-80N3 Timer Remote Controller when used with a
5D would allow one to take multiple exposures on a single frame?

No, it doesn't provide that functionality.


The question is then, how does one add exposures? To get the
effect of exposing on one frame, one should add the raw files,
before gamma correction, that is, with a gamma of one.
This is easy to do using the Canon-supplied RAW - TIF convertor
and Photoshop. Convert to TIF using the Canon-supplied
Digital Photo Professional, set to "linear". Then make
each exposure a new layer in Photoshop, adjusting the
opacity to make them add up right. Flatten the image, and
finally use Curves to correct the appearance. You will need
a curve with at least three correction points other than the
two at the ends. It should rise steeply from zero, and the
slowly flatten out.

This actually works perfectly. This might be a good case for
buying CS3, with its "active layers". Has anybody tried it
in CS3?

Doug McDonald

Doug McDonald wrote:


The question is then, how does one add exposures? To get the
effect of exposing on one frame, one should add the raw files,
before gamma correction, that is, with a gamma of one.
This is easy to do using the Canon-supplied RAW - TIF convertor
and Photoshop. Convert to TIF using the Canon-supplied
Digital Photo Professional, set to "linear". Then make
each exposure a new layer in Photoshop, adjusting the
opacity to make them add up right. Flatten the image, and
finally use Curves to correct the appearance.

I should have added that you really need to do this with 16 bit
files. Without the original correction using gamma correction,
8 bit files result in banding.

A good place to start with Curves is with three intermediate
points at 16, 93 and 45,166 and 120,222, with the ends
at the usual 0,0 and 255,255. Small changes from these will
result in a pleasing result.

Doug McDonald

On 05/04/2007 "Annika1980" wrote:
On Apr 5, 9:54 am, "paro" paro wrote:
Not a problem with the 20D:
http://www.pbase.com/bret/image/64251969

It might be that you are not that well attuned to astronomy, the moon and the
stars move almost at the same rate in the night sky, so you'd not likely see
them cross paths in a photo g.

No ****, Sagan.
I'm attuned enough to know that if you took photo #1 with the moon and
the star in their respective positions, and then later took photo #2
after both of them have moved, there is a chance that the moon in the
second photo will occupy the same spot as the star in the first. So
doing a double-exposure will show the two moons, the second of which
has a star inside it.
Compositing the photos digitally gives a better result since you would
avoid the "ghosting" that occurs with traditional multiple-exposures.


But the photo of the pitcher made me wonder, with a multiple exposure like
that, there would seem to be issues with lighting. I mean, the pitcher
himself
in each exposure reflects the light for a single exposure; but the anything
static in the image (background, pitcher's mound) would have four exposure's
worth of light built up. Not apparent in that image though. And how do you
know that Bret is using a 20D and that that image is a multiple exposure? I
couldn't find anything on the site.


It was a joke. Obviously, that photo was a digital composite.
Otherwise, you'd have a ghost pitcher (or a ghost pitcher picture)
which you could see right through.


I've zero exposure to digital composites or multiple exposures on a single
frame, either one, so I took the statement at face value, though it didn't
seem to match what you'd said before.

On 07/04/2007 Derek Fountain wrote:
paro wrote:
Does anyone know if the Canon TC-80N3 Timer Remote Controller when used
with a
5D would allow one to take multiple exposures on a single frame?

No, it doesn't provide that functionality.


Thanks, that's the info I was looking for.