Subject: Why I'm Keeping My ETX-90M Sent: Wednesday, October 7, 2009 21:48:26 From: chris brown (email@example.com) Please cancel my ETX-90 ad in your "For Sale" section. I decided to keep the ETX-90M, and heres' why... A few months back, I got a used Celestron/Vixen 80mm f/11.3 Achromatic refractor (Japan), mounted to a Meade LXD-55 manual mount, and I have been using it as my backyard instrument instead of my ETX-90. The Vixen has truly wonderful optics, and the capability of 200x powers. I thought it was time to retire the ETX. Tonight, I finally had a side-by-side comparison of the two telescopes, here's what I found out... On Jupiter, about 100x (9mm circle-T Ortho for the Vixen, Chinese 12.5mm Plossl for the ETX), the ETX shows a brighter image, and definitely higher contrast then the Vixen! Details in the main bands took on a greyish tone in the vixen, and came in and out. Through the ETX, the details were bolder and steady. I thought the non-CO telescope would have a contrast advantage, not so, but it did have a wider FOV... Next, I pointed at WZ Cassiopia, a nice little red/blue double, and the ETX showed a slight color advantage. The same dim stars were averted vision in both telescopes but again, the Vixen had a wider FOV. Apparently, the extra 10MM of aperture makes a difference, even with a central obstruction! Also, the ETX has no false color, which seems to affect the Vixen at times. Both telescopes have excellent optics, but I have decided to keep the ETX because not only does it do everything the Vixen does, it's half the size! Next week, Im doing a Moon shoot-out! I have yet to see a craterlet in Plato with the Vixen, I've seen 5 with the ETX on one great night! I'll keep you posted! Good to be back! Regards, Chris Brown
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