Anyone have a howitzer?
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I have a 6 inch light gas gun capable of launching several Kilograms at
several hundred meters per second. It is a laboratory instrument used
only for scientific work. I am not sure that pounding some sense into
Science.Astro.Amateur would be considered appropriate usage but it
might take something of the magnitude to get it back on track...

As far as SCT's with open frames, probably few and far between but I
think there are Schmitt Cameras that are open frame design.

jon