#1. "RE: Nikon D800 and D800E" | In response to Reply # 0mwhals Nikonian since 18th Apr 2004Tue 07-Feb-12 01:29 AM | edited Tue 07-Feb-12 01:32 AM by mwhals
Anti-Aliasing filter. It prevents Moire patterns from developing on the electronic image. The filter sits in front of the CCD.
Shoot nature with respect and don't trample it or startle its inhabitants. :)