[Aavso-photometry] Where do the professionals source

[Michael Koppelman]

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.