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Old Saturday 7th October 2017, 18:10   #2
Binastro
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Join Date: Aug 2012
Location: S.England
Posts: 4,457
The Pentax 12x50 SP is I think a Porroprism binocular with wider objectives.
Close up the effect you describe can occur.
Try altering the IPD, see if it helps.

The Puffin may be a roofprism with narrower spacing.

So long as at middle and far distance you have no eyestrain at all it should be O.K.
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