>> ...but even with 15 second exposures the trapezium shows a little >> blooming with my camera. >> ...I don't know how you can do it with a non-anti-blooming camera, though. Would there be any objection to using a small stop of, say, 2-3cm aperture over the telescope and use the usual short exposures for such cases? \Brian -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.