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The longer f/lengths are fine.i have a pair if 15 for binoviewingand they're ok, its below 15 the eye relief becomes too tight & it feels like you're peeping thru a pin hole.
If it were me I'd look for a 7-9mm ep,
Cheaper option BST explorer 8mm at telescopesastromomy in SA-60deg & comfortable er
Explore scientific have 6.7 & 8.8 wider field 82 deg less comfortable-tighter er
Vixen lvw 8mm
ES 9mm 100deg
Etc
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