Interesting and useful for anyone interested in top end DSLRs - Canon or other. This 123 page document gives a detailed description of the what and why of the design of Canon's top digital camera and compares it to the prior model. While it's necessarily a Canon promo it also provides extremely valuable [tm] insght into what it takes to build a top camera, what factrs are important and how they interact. http://www.usa.canon.com/uploadedimages/FCK/Image/White%20Papers/EOS-1D%20Mark%20IV%20WP1.pdf Gus will like their acronym for the wireless data transfer unit mention on pages 89 - 90. 1 stop of sensitivity improvement in RAW and 2 stops in JPEG over the MK III is useful, but more would (of course) be nice. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist