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Hi Stephen,
I've had mine for a few years now so I can't remember where I bought it from. It was A3 in size and I just scissored off the bit I didn't need (to make a square). My scope is a 10" RC but the tube is nearly 12" dia. The power source has a built in control to dim the light for better exposure control. I do most imaging in Narrow Band and find the my EL panel is not too good at Ha and SII frequencies. H-alpha flats @ 1x1 were taking ~ 400 secs! I now use a translucent panel over the end of the scope and take flats in dull daylight.
Charles
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