Quote:
Originally Posted by John W
Super detail Peter - nothing wrong with that Coronado 90. Thanks John W.
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Ta. My double stack system has an original (and awesome) Coronado SM90, with a Meade (adequate) tunable 90mm etalon. I've found the front mounted etalons give more even field illumination than rear mounted filters...but are now rather expensive in larger apertures. (a single Lunt 100mm etalon is pushing $A12k these days) ...very glad I got them many, many and far more affordable moons ago.