Here's the optical formula you can judge for yourself.
http://www.bdimitrov.de/kmp/lenses/zooms/_optics/17-70f4.gif On 9/12/2014 10:11 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
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