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Message: <blockquote data-quote="jring" data-source="post: 3345867" data-attributes="member: 133897">Hi,the 823M seems to be a later version with improved grey vs. green body (the 820 series had a not too strong plastic body). See the following thread. So the 820M series should be fully compatible to the 820 series but to no other Kowa scopes, although adapters exist to use small form factor EPs (from TSN-1,2,3,4 TSN-600/610 and TSN-660 series) on the 820 series.<a href="http://www.birdforum.net/showthread.php?t=12045" target="_blank">http://www.birdforum.net/showthread.php?t=12045</a>PS: Thanks a lot to jrp jr for posting his experiences with the celestron EPs!Joachim</blockquote>