[Aavso-photometry] Where do the professionals source

[Bob Koff]

FWIW, I have had the same Schuler B and V filters for four or five 
years, with no sign of any gunk.  I'm in the Denver area, with a 
generally dry climate but large extremes of temperature. 

Bob Koff

Michael Koppelman wrote:

> This is, of course, not practical for a working observatory. I touch  
> my CCD/focus as little as possible. I'm certainly not going to  
> unmount the CCD every night. Given that this seems to be a reality it  
> sounds like I have to treat my V filter as a consumable resource and  
> just buy a new one every few years.
>
> It's funny because I have a Custom Scientific filter that I haven't  
> used in probably 3 years and it is in perfect condition -- no gunk.  
> This situation must be a result of varying temperature/humidity  
> because the filter in question has been stored without desiccant for  
> years and shows no degradation. I had previously stored it in my  
> observatory and still it had no degradation. This makes me wonder if  
> the problem isn't aggravated in some filters over others.
>
> Michael
>
>
> On Sep 23, 2005, at 3:11 AM, Richard Miles wrote:
>
>> That's good advice re. storing of filters and filter glass.  One is  
>> well advised to store V and B filters in a closed container with  
>> dessicant such as dry silica gel.
>
>
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