If the filter was a Thousand Oaks Type II, or Baader film, my suspicion is the secondary spot on the corrector may be slightly too small, allowing light from the main mirror to pass it by, reflect off the inside of the filter and into the eyepiece. Adding the post it note covered at least part of the overshooting the secondary, thus reducing the reflection. Steve Dodder Coordinator, Grand Canyon Star Party, North Rim Chairman, SAC Novice Group Director, Stone Haven Observatory sdodder@xxxxxxxxxxx Visit my web site at http://www.stonehavenobservatory.com > Date: Sun, 27 May 2012 21:38:42 +0000 > From: joalth@xxxxxxxxxxxxxxx > To: az-observing@xxxxxxxxxxxxx > Subject: [AZ-Observing] reflections in Maksutov with solar filter > > I would like to ask those who have more optical knowledge than I have. > Recently I used a solar filter on a Maksutov style telescope. When I first > used it there seemed to be a lot of reflections showing in the eyepiece. > Looking at the central reflective surface of the corrector plate I tried to > reduce the problem with a round piece of Post-It note. This seemed to help??? > Are there any ideas or comments or concerns with trying to reduce reflections > with this type of optic. Thanks in Advance for any advice or comments. > > John Thompson L.H.C. astronomy Club > -- > See message header for info on list archives or unsubscribing, and please > send personal replies to the author, not the list. > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.