Why is the body open?

Started Feb 9, 2013 | Questions thread
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Re: Why is the body open?
In reply to GuyMcKie, Feb 10, 2013

Sort of off topic, but anyway :

AFAIK the original Tamron Adaptall 90mm f2.5 is prone to what you refer to as sensor flare ( bright spot ) and that has a flat rear element.  Later models, which don't have that issue, have a curved rear element.  I suspect that a concave rear element would also have potential for this issue.  Presumably convex rear elements don't have this issue.

Of course coatings might also help with this, and we know coatings have improved a great deal over the years as well.

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