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The Astrotech 8" F/8, Revelation 8" F/8 and Orion 8" F/8 are the same telescope, Manufactured by GSO. The Orion one has a different tube.. The Orion one has a different tube, made of aluminium which isn't as good as the Astrotech which is carbon fibre...
All of these scopes are largely the same as the GSO 8" F/8 RC that can be bought in australia for $2195~ from ATS..
The Orion F/6 8" RC that you linked is likely a typeo... When you look at the specifications page of that scope, it says its 8" F/6 (1000mm focal length) however directly underneith that, it says Focal Length : 1600mm, Indicating that the scope is F/8...
These scopes are proving to be very nice imaging scopes provided you're interested in fairly long focal length work... 1600mm is not exactly a wide field.
Being that I own one of these scopes I can tell you this much, They represent good value for money, and no matter which one you go for they are all "pretty much" exactly the same...
GSO use the carbon fibre tube, and a vixen style dovetail
AT use the carbon fibre tube and the losmandy D-plate
Orion use an aluminium tube and the vixen style dovetail
The revelation scope seems to use the carbon fibre tube and vixen dovetail, the same as GSO releases from the factory.
Personally, it depends on what dovetail you require I suppose, I went for the GSO simply because I could get it cheaper in australia than I could have imported the Astrotech 8" from the US once you take import taxes into account..
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