[Aavso-photometry] Filter Question

[Shawn Dvorak]

Michael Crook wrote:
> Hi Everyone,
>
> I've had my FLI CCD serviced and decided to sell it
> on.
> I'm thinking of replacing it with a NABG SBIG ST402ME
> purely for photometry.
>
> Are Schuler a recognized manufacturer of photometric
> filters? Would their 1.25" 'V' band filter be
> compatible with the SBIG ST402ME i.e. do they screw
> into the nose-piece? There don't seem to be any UK
> outlets for Photometric filters, but I've found a USA
> supplier who will ship to the UK.
>
> Many thanks,
> Mick   
>
>
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>   
Mick,

I've used the Schuler filters for photometry with the standard 
nose-piece on my ST9 for several years.  The transformations are small 
with my system so they're a good match to the standards.  No issues 
beyond the oft-reported deterioration of the V filter (which is a trait 
common to several brands of V filters, not specific to Schuler's).

Shawn