I think you'll like you Burgess TMB 5mm.
I got a half hour between the clouds at Mars last night with Burgess/TMB 9mm, 7mm, and 5mm (I even pushed my luck with the 2.5mm, not successfully I might add). The extra afov afforded by these eps comes into its own when you have a non-tracking mount like a dob. It's so good to see your target float through the (large) fov crisp and clean from edge to edge.
I can't fault any of mine. Perfect choice for this and every planetary opposition IMHO.
Cheers
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