So I'll be going out to Yosemite in a few weeks and hope to take some decent photos. What I have in my arsenal is the following... Canon xsi 2x4GB card (I'll have a laptop to dump the pix off on) Canon 50mm F/1.8 Canon 18-55mm F/3.5-5.6 IS Tamron 28-75 F/2.8 (followed by too many letters) UV filer for all, C. polarizer for 50mm and 28-75 NO lights Are they any equipment suggestions on what I should get? maybe a rental lens or ND, GND filters? Any tips and advice would be welcome. Thanks!