On 13/09/2014 12:13 AM, Rob Studdert wrote:
If the elements are bonded they shouldn't act as a surface.
I'm sure they do, but I still run into the higher math problem.
I am rather a simple man of pleasures.
bill
On 13 September 2014 15:54, Bill <anotherdrunken...@gmail.com> wrote:
On 12/09/2014 8:11 PM, Igor PDML-StR wrote:
How many surfaces does this lens have?
http://42graphy.org/misc/Baikal/_IR29947.jpg
(for those ready to cheat: it's Pentax 17-70/4 at f/22)
I didn't expect to see so many reflections from all the surfaces.
That's what I assume was the reason for all those spots. Right?
Igor
17 elements in 12 groups. I consider that to still be 34 surfaces. For me
figuring it out otherwise is higher math.
I've found that water spray can do that sort of thing too, if you were near
some surf or a waterfall and got a bit of mist on the lens.
bill
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