the MM in a lense is the focal length in MM. dpreview.com under glossary if u dont know what focal length is.and yes, a UV filter is a must for all shooting conditions for various reasons. other filters are nice, circular polarizer is really the only other one i use.
"The 1911 is a collection of subsystems that must work together. Each part must be prepared and fit properly not only in and of itself, but also with regard to the other parts with which it must operate for the gun to function and appear as desired."
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