FYI - I've recently acquired a C6-S w/XLT. In doing some compares between it and my Orion 10" XTi (F/4.7) I was quite surprised with its light thruput...much more than I expected from a 6". In my neck of the woods, usually Limiting Mag is 4 and 4.5 on a good night, this little 6 stayed surprisingly close to the 10" relative to faint stars and DOS (although of course slightly higer mag with the C6 - 80x vs 63x).
Attached is a drawing of the heart of Pleiades showing TFOV differences -- I was testing out an Antares 19mm W70 on loan from Jon Isaacs. Within the C6-S's TFOV, I marked the stars with hashes to show the only extra ones that the 10" showed. I would have expected much more. Aparrently the XLT coatings are doing a good job.
Attached is a drawing of the heart of Pleiades showing TFOV differences -- I was testing out an Antares 19mm W70 on loan from Jon Isaacs. Within the C6-S's TFOV, I marked the stars with hashes to show the only extra ones that the 10" showed. I would have expected much more. Aparrently the XLT coatings are doing a good job.
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