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Canon DSLR Challenge | all galleries >> Challenge 110: PINK FLOYD Songs (Hosted by Yuvraj Dodia) >> Eligible > Dark Side - JH
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06-JAN-2008 Jim H.

Dark Side - JH

Canon EOS 40D ,Canon EF-S 60mm f/2.8 Macro USM
1/500s f/6.3 at 60.0mm iso200 hide exif
Full EXIF Info
Date/Time06-Jan-2008 03:43:15
MakeCanon
ModelCanon EOS 40D
Flash UsedNo
Focal Length60 mm
Exposure Time1/500 sec
Aperturef/6.3
ISO Equivalent200
Exposure Bias
White Balance
Metering Mode (-1)
JPEG Quality
Exposure Programprogram (1)
Focus Distance

other sizes: small medium original auto
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Canon DSLR Challenge09-Jan-2008 10:44
I used a very bright portable spotlight for the light source. It's actually got a high intensity discharge lamp in it. And that probably explains the somewhat odd spectrum. I had thought to use a slide projector, but when this thing worked OK, I just stuck with it. I set the prism on a piece of white foam-core and adjusted the angle and height to get the light beam to hit the prism the way I wanted. Then I used a couple of boxes to block the light on the left and the right, limiting the beam's width. Sort of a cardboard collimator, I guess :)

Then I just set the exposure based on metering for just the bright spectrum area and that makes the greatest part of the shot come out black even though it was all white foam core. I also moved the black point up quite far when processing the RAW in DPP.

I really should try it again with the slide projector. The spectrum might be "smoother" from the incandescent lamp versus this HID lamp. I'd also like to see if I could get a narrower beam.

Thanks! Jim H.
Guest 07-Jan-2008 03:06
Very Nice, Jim. I like your crop :)

I am interested in knowing how you created the light source? :) Thanks.

Canon DSLR Challenge06-Jan-2008 16:53
Cool, well-done Jim! --mlynn
ctfchallenge06-Jan-2008 13:03
Cool Jim.
theFly
Canon DSLR Challenge06-Jan-2008 12:50
Had to be Jim? Love it.

I searched around for a decent prism... used to have lots in the Physics Lab... but not now.

Just as well, this is great.

~ Regards Melbob
jnconradie06-Jan-2008 12:32
Trust Jim H to do a real prism and light beam! :-) Cool! Regards Nico