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Hmmm ... tricky. I assume you tried to tweek the focus but just couldn't get it right in the centre. [At f/5 the curvature of the scope's focal plan means that with many eps the best focus in the centre is different to the best focus at the edge of the fov.] Otherwise, do you have a smudge on the eye lens of your ep? With many short fl eps it's easy to touch the eye lens with your eyeball without noticing. I have that problem with my 5mm ortho but not with the 7mm. And plossls have even shorter eye relief than orthos.
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