View single post by Robert

Posted: Sat Jun 2nd, 2012 05:47

Joined:	Mon Apr 2nd, 2012
Location:	South Lakeland, UK
Posts:	4066
Status:	Offline

Could be a factor but I think there are two fairly obvious factors which are plainly visible, firstly the size of the rear element, and secondly the curvature on the rear face of the rear element.

I don't have enough lenses to be able to sort this out but the worst offenders seem to have large and flat rear elements, whereas the better performers have smaller and less flat rear elements.

I may of course be wrong, it's only a hunch limited by the small sample of lenses I have.

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Robert.