There's been documentation on the Audifans lists (too bad archives searches are so futile anymore) of high output bulbs causing lens fractures with stoneguard on them. At 02:08 PM 7/13/2005 -0400, LL - NY wrote: >I have (and I know Taka had) Stoneguard on my 200's lenses. I too, >would worry about high wattage bulbs with the Stoneguard. >