Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues
worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.
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DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.
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The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.