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I have used these in the past and they are excellent. The larger ones are 12*12 inches.http://www.omega.com/ppt/pptsc.asp?ref=KHR_KHLV_KH&ttID=KHR_KHLV_KH&Nav=
It would be interesting to see if there were any thermal gradient effects in a scope as large as a C8. If you ever decide to give it a try, I'd be interested in the feedback.