From: Alan Friedman <alan@greatarrow.com>

Date: June 22, 2006 9:15:32 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Jupiter through my 6" refractor

Eric -

The IR pass filter I have is from Schuler - I don't remember the spectral response numbers. CCD chips are quite sensitive to IR - you will definitely notice the brightness increase as you move from R to IR. The RGB filters I have are an SBIG set purchased some years back - they do have IR blocking coatings.

Alan

On Jun 22, 2006, at 6:03 AM, Eric wrote:

Alan,

Just a couple of quick questions here- what brand of IR filter are you using? I tried one on Jupiter myself last year and found much reduced gain over the RGB set, but I think it was definitely due to the brand/ frequency response I had used. Also, is the R filter you use IR blocked or not?

Thanks,

Eric

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