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Old 28-05-2008, 08:06 AM
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Robert_T
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is IR/UV filter needed for DSLR?

Hi All, I've ordered the IDAS-LPS filter (2in) for use with my Canon 40D to help deal with the light pollution in my area.

Is an IR/UV filter also a good investment to sharpen stars etc. And is there any problem in combining with the IDAS-LPS. I got the latter because it appears to have the least issue with colour correction in later processing and wouldn't want to ruin that with an innappropriate IR/UV combination.

thanks,

Rob
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Old 28-05-2008, 08:06 PM
tornado33
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Hi
The Idas LPS blocks IR fairly well, I find a separate uv/ir finter is not needed. With my Baader UHC-S filter however a filter IS needed as IR gets through. The LPS filter will come with a graph of its passbands and theres virtually nothing in the IR
Scott
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Old 28-05-2008, 08:57 PM
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Quote:
Originally Posted by tornado33 View Post
Hi
The Idas LPS blocks IR fairly well, I find a separate uv/ir finter is not needed. With my Baader UHC-S filter however a filter IS needed as IR gets through. The LPS filter will come with a graph of its passbands and theres virtually nothing in the IR
Scott
Thanks Scott, I'll see how I go then with just the LPS.
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Old 28-05-2008, 09:40 PM
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Rob, the Idas LPS filter will serve you well, that is all I use with my 5d and Tak set-up, 7-8 minutes is quite on the cards depending how bad you light pollution is.

Leon
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Old 28-05-2008, 10:05 PM
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Tandum (Robin)
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Bob,
Where did you order it and what is it costing you?
I have an 1.25 SkyGlow filter and it makes seeing nebula a lot easier in the eyepiece.
A quality 2" one would be worth buying for the camera.

Last edited by Tandum; 28-05-2008 at 10:26 PM.
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Old 28-05-2008, 10:09 PM
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Rob if your 40D isn't modded then you won't need an IR filter. In fact the IR filter that is built in is way tooooo heavy handed and cuts out plenty of the red as well. Hence the trend to mod the camera and have a more selective IR filter (or no filter only a piece of glass for doing IR photography) installed.
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Old 29-05-2008, 07:40 AM
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Quote:
Originally Posted by Tandum View Post
Bob,
Where did you order it and what is it costing you?
I have an 1.25 SkyGlow filter and it makes seeing nebula a lot easier in the eyepiece.
A quality 2" one would be worth buying for the camera.
Hi Robin, I ordered it from OPTCORP in the states. The 2in runs at $189US. Pricey, but from all I've read probably the bets all round light pollution filter for digital imaging. These guys have lots of good gear. Their e-mail address below.

internetsales@optcorp.com
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