I'm not entirely sure Bryan but I believe the later ones are better for very fast scopes (at f/3.5 to f/4). Other differences exist. I found my one to be well suited to my f/4 and f/5 scopes. I used it for many years doing astrophotography with good results.
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Originally Posted by PostalRuhl
Hi, how does this differ from the other versions? Would it work just as well?
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