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That is how large my old 12.5inch RCOS was.
If you use one of those you will need a beefy mount and also some wind protection as light winds will most likely mean you can't image.
12 inches is serious aperture and you should be able to get some really nice images with that. Galaxies really start to pop, detail comes up in usual objects. An STL11 would be a good match. Guiding with a guidescope is no longer an option at this focal length.
An offaxis guider or self guiding is now a must.
Greg.
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