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Have to say that I don't like the 17T4 in my 8" LX90. The outer 15 percent or so is just not sharp and clear. I much prefer the 18 mm Radian because of its more compact dimensions and lighter weight. A very agreeable and fully useable 60 deg. AFOV.
In a Newtonian it's a different story. Stunning, immersive! You just run out of superlatives. Put an OIII filter on your 17 and line up the "Tarantula" in the LMC. If Hell exists at all I'm sure it must be there! It looks like something out of Dante's "Inferno".
Mark.
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