The reason for a backup in general is obvious. I had my MV1 break during my trip to Africa and was fortunate enough to have a kindly Nikon User lend me her backup F4 (it was a backup because the AF pin was broken; this is my only Nikon experience, but it was 15 rolls) A film backup for a DSLR is fine, but his means you also have to carry film. Ideally, if you're shooting digital you want digital backup. Also, your choice of lenses would be different with 35 mm and APS sensor.
Steven Desjardins Department of Chemistry Washington and Lee University Lexington, VA 24450 (540) 458-8873 FAX: (540) 458-8878 [EMAIL PROTECTED]