View Single Post
Old Saturday 7th October 2017, 18:10   #2
Registered User

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.
Binastro is offline  
Reply With Quote