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Topic - Didymium filters again.

davidbeynon - on 22 May 2012
I picked one of these up about 6 months ago to see if it helped with light pollution from sodium lamps. I had a go with it in the Julian Alps last year, but results were inconclusive.

Anyway, I thought I would experiment again last night.

This was taken from the pavement outside my house, which is on the edge of Yate, a medium sized town about 15km from Bristol. There are 4 sodium streetlights within about 50m.

http://www.spectral3d.co.uk/misc/DSC_2563.JPG

I didn't think to take a control, but from experience I can tell you that you would see a bright yellow image with maybe 2 or 3 stars peeking out.

Motion blur is due to not tightening the ball head on my tripod properly and it drifting a bit :)

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