I have a TeleVue Pronto set up to quickly switch from an H-alpha to a Herschel wedge view. Here is a toggle animation between two images made at 17:17 UT on December 28. The frames are registered on the prominent sunspot, and there was some rotation of the disc in the 4 1/2 minutes during the filter change-out. The file is 4.5 Megabytes, so give it time to download. http://www.pbase.com/polakis/image/148059903 Tom -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.