I have finally managed to clean the inner elements of the lens to see if it
makes any difference (the 6th element was quite dirty). They are sparkling
clean now. However, I have noticed there are 3 bright rings (belong to
element 3, 4 & 5/6) when looking from the front of the lens. I didn't pay
much attention before so I do not know if they were there. Could all you
15mm owners see if yours are the same? Hope it was not an oversight when I
was assembling the lens. I shall conduct the final test tomorrow. :-)
http://www3.telus.net/wlachan/15mm.jpg
Alan Chan
http://www.pbase.com/wlachan
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