I worked on an XR35 that was very corroded-(it was basically a Mitchell w/ variable shutter, and the body was a lightweight blimp)-the magazines also had very bad corrosion, this happened to a lot of magnesium made products like PL mount conversions for 2C's etc. If the paint was chipped and then ignored, corrosion started to do its damage- a white powder that would take over if left untreated. I saw a 2C w/ CP mount that was stored for years, and the lens mount corroded so badly it was almost beyond repair-anyway, a properly maintained XR should work fine, but they are huge-
I like the R35 and MKII Mitchells(modified ones are used in the Spacecam system by the way, w/ 1000'mag at the bottom )but if what you're trying to do is shoot sync sound, it's probably difficult to find a blimp for them. A 2c w/ blimp would be lighter
John Babl
Miami