Quote:
Originally Posted by MortonH
Good one, Brian 
On the APM website it says "you can screw the ND3 filter directly into the eyepiece connector".
Maybe they've changed the design to allow different ND filters to be used like the Baader version. |
The real difference is that the Baader wedge allows both the SC and the OD3 ND to be permanently attached, making it very safe and easy to use. It, though, is only available in the 2" format and has quite a long optical path, about 10mm longer than the standard dielectric ClickLock.