cloudy moonshine by Canon DSLR Challenge


28-OCT-2007	Tom Doyle

The 'green planet' is from double-glass window reflection (it's really the moon again).

Canon EOS 40D ,Canon EF-S 17-85mm f/4-5.6 IS
1s f/5.6 at 85.0mm iso1000 hide exif

other sizes: small medium original auto

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Canon DSLR Challenge		29-Oct-2007 10:03
You actually have three moons there Tom. Sometimes with such a bright object you can get significant internal reflections in the lens to produce a secondary spot like this. That lens has 17 elements in 12 groups and although the internals are coated to reduce reflections it is not possible to totally avoid them. The colour shift of the prominant greenish spot makes me think that is an internal reflection of the image. The whitish one is more likely, as you suggest, double glass 'refraction' effect but depending upon the angle that this was taken, it could also be an internal reflection. It is interesting to play with shots like this to observe the various effects produced. Shooting through double glass, well that is a challenge. ~ Regards melbob