I seem to have got the reflection issue with the double stack CaK filter sorted out (the reflection is out of the fov!) - as a result there is a lot more contrast visible. Infact, if you click on the full disk image and view it in Flickr it is quite easy to see the prominences at the 8 o'clock position. Bear in mind that this image was taken with the 40mm ota at f20 with a DMK31 camera and the results are very promising. I may look at getting a 2" Baader U-filter (venus filter) to use as a full aperture ERF with this scope as a way of reducing the thermal load on the Baader K-line filter that is currently being used as a sub aperture ERF.
