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 Post subject: Astronomik CLS filter
PostPosted: Mon Oct 04, 2010 10:48 pm 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8025
Location: UK
Manufacturer's page: http://www.astronomik.com/en/astronomik_cls_filter.html

They describe it as a "budget" filter. If this is budget, I hate to see what an expensive one is! Although they don't actually call it a light pollution filter, its main function is to block sodium and mercury lights, passing most important astronomical wavelengths.

I went for the EOS clip version, which sits in a receptacle between the mirror and lens mount on APS-C Canon cameras. This way I can use it with any lens apart from Canon's own EF-S lenses which fit into the same area.

By eye, the filter reflects and passes all sorts of funky colours depending on the angle you look at it. It is more stable when mounted and looking through it with a lens, and introduces an odd colour cast to normal

The biggest question: what does it really do?

Image
Taken normally, 10 second exposure, f/5.6, ISO800. White balance fixed at "sunny" for no particular reason other than it was the first one apart from AWB. This is to prevent colour shifts due to AWB for this comparison.

Image
This is with the filter in place. Same exposure as above! The orange glow is practically gone. Only where the lights are clustered is there any significant output.

Image
What if we rack up the exposure some more? What do we see then? 30 seconds, f/5.6, ISO3200.

Now if that cloud will get out of the way I'd put it to some serious use!

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PostPosted: Mon Oct 04, 2010 11:03 pm 
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Joined: Mon Jan 14, 2008 1:25 pm
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Location: Scotland
Shooting in Glasgow city center at night has just got more appealing :wink:

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Mark Osborne
My life through an iPhone


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PostPosted: Tue Oct 05, 2010 11:46 am 
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Joined: Sat Oct 11, 2008 8:27 pm
Posts: 404
Location: Bristol, UK
Another reason for me to be jealous!!!!

Looks like the filter is gonna do the biz, I'm expecting some great shots once the clouds has evaporated.

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Lee Diggle
My Astronomy Blog | My Photography Gallery


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