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A Uo orthoscopic will give the sharpest view with best contrast and minimum light scatter and would unreservedly recommend it if you had a scope on a driven mount. For a dob, no.
Vixen LV has nice eye relief but a rather narrow fov and light scatter.
TMB planetarys have comfy ER, and widish fov at 60 degrees but suffer light scatter and can be soft off axis, but you're f8 so should be ok.
Personally unless you want to shell out for a pentax xl or xw I would suggest the tmb planetary.
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