Venus Transit * by Canon DSLR Challenge

Canon DSLR Challenge | all galleries >> Challenge 64: Round (host: Sharon Lips) >> Exhibition > Venus Transit *


6/8/2004	Andrew Chatman

Venus Transit *

Victor, NY

This is the first Venus Transit (crossing) of the Sun that humanity has been able to record in the Hydrogen-Alpha wavelength, capturing the power of the sun in all its glory. The small black orb is Venus silhouetted against the face of the Sun.

Canon EOS D60 ,70mm refractor scope with H-Alpha filter

other sizes: small medium original auto

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elips		27-Mar-2006 03:56
Cool! Thanks for the explanation! ~Sharon

Canon DSLR Challenge		26-Mar-2006 23:36
Sharon, what a great question. The hydrogen-alpha filter lets through only a very narrow band of visible light centered around the h-alpha wavelength. When I look through the eyepiece, my human eye can convert that information into the red area of the spectrum where it truly lives. However, the digital camera only pulls this information into the red channel, giving me a grayscale conversion of the h-alpha information. What you see below is a careful reproduction of the colors I see through the eyepiece, falsely created in Photoshop.

elips		26-Mar-2006 20:16
Gorgeous again! Does the color come from the Hydrogen-Alpha wavelength? ~Sharon