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Old 16-09-2007, 10:16 PM
garymck (Gary)
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IDAS 48mm Light Pollution Suppression Filter

Hi,
has anyone used one of these filters for imaging with a DSLR. Interested in how well it performed from a light polluted site? Increases in possible exposure lengths? Worth the money?

cheers
Gary
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Old 17-09-2007, 06:42 AM
Ingo
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I'd also like to know
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Old 17-09-2007, 08:07 AM
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Worth every cent that they cost. I could not do wide field from my light polluted sky over my backyard in suburban Melbourne without it. In fact I possess three a 48mm, 52mm and 58mm. All of my images are done with the Hutech LPR filter unless specified ie Hutech Nebula or Astronomik narrowband. They are also very robust so cleaning is not an issue. The main advantage they have over other brands is two extra peaks between light pollution wavelengths.

The optical quality is very good and if you swap a Hutech LPR filter for the Hutech NF focus does not change.
Here are a few examples
All done with a Canon 5DH and Canon 300mm F2.8L, Hutech LPR filter.

Lagoon & Trifid 2.5MB
http://members.optusnet.com.au/~trlee8/LAGTR_L.jpg

Corona Australis 2.1 MB
http://members.optusnet.com.au/~trlee8/corA_ehdr07.jpg

Omega Cent and Centaurus A 2.8 MB
http://members.optusnet.com.au/~chee.../OC&CA_HDR.jpg

Here is a mosaic done with a Hutech Nebula Filter 2.5MB
http://avandonkbl.bigblog.com.au/dat...0113220304.jpg

Bert
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Old 17-09-2007, 09:49 AM
garymck (Gary)
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Thanks Bert,

just the info I needed. Which filter would you recommend as a first purchase?

Hutech or Astronomik?

cheers
Gary
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Old 17-09-2007, 12:15 PM
Ingo
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Quote:
Originally Posted by avandonk View Post
Worth every cent that they cost. I could not do wide field from my light polluted sky over my backyard in suburban Melbourne without it. In fact I possess three a 48mm, 52mm and 58mm. All of my images are done with the Hutech LPR filter unless specified ie Hutech Nebula or Astronomik narrowband. They are also very robust so cleaning is not an issue. The main advantage they have over other brands is two extra peaks between light pollution wavelengths.

The optical quality is very good and if you swap a Hutech LPR filter for the Hutech NF focus does not change.
Here are a few examples
All done with a Canon 5DH and Canon 300mm F2.8L, Hutech LPR filter.

Lagoon & Trifid 2.5MB
http://members.optusnet.com.au/~trlee8/LAGTR_L.jpg

Corona Australis 2.1 MB
http://members.optusnet.com.au/~trlee8/corA_ehdr07.jpg

Omega Cent and Centaurus A 2.8 MB
http://members.optusnet.com.au/~cheekyfish/OC&CA_HDR.jpg

Here is a mosaic done with a Hutech Nebula Filter 2.5MB
http://avandonkbl.bigblog.com.au/dat...0113220304.jpg

Bert
How do you think it would do with very widefield...like milky way stuff @ 36mm
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Old 17-09-2007, 03:58 PM
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As they are a type of interference filter ie dichroic and not absorption they fail at really high at wide fields and attenuate and discolour the extremities.

The 58mm LPS filter is fne down to 50mm focal length

Bert
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