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Hi ron, I've been waiting to see how one of these 8inch Maks perform on planetary. Some good detail here, you certainly should be able to use the 2.8 barlow when seeing etc allows.
Collimation is of course critical to get fine detail. For a Mak of this size though getting it to ambinet temp is likley to be as big a problem as poor seeing. The thick glass really slows cooling. WIth my SCT I need at least an hour to get near ambient... you can double this or more for a Mak unless you have some form of active cooling system (fans, peltiers etc). This really does have an enormous impact so worth putting some thought into.
Anyway, thanks for sharing your shots. Well done!
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