I'm glad the Internet did not exist back in the day, otherwise I would have read in some "forum" my Genesis was an achromat and that I was using it on the wrong objects. Some of you just crack me up
Let's get something clear, the ---- original ---- f/5 Genesis is NOT an achromat. I've owned plenty of 4" achromats of various focal lengths over my 30+ years in astronomy. Instruments ranging from recent vintage "Made in China" Meade/Celestron branded to a Lundin crafted 1914 Alvan Clark with plenty of Made in Japan Unitrons and Vixens in between. The tiny amount of color in the Genesis (mainly outside and inside of focus) is not even remotely close to I see in any 4" f/15 achromat....let me say that again...not even remotely close.
Let's also get something else clear, the -----original----- f/5 Genesis CAN be a great instrument to view our solar system neighbors . Only reason why I say it can is because of apparent sample to sample variation as some owners have posted. My particular scope soaks up magnification without loss of contrast / definition. I regularly use a 5X Powermate and 7mm Pentax and 10mm Ethos for planetary/Moon and double star viewing. Just like with above mentioned achromats I have also had the privilege to own several 4" APOs, from the legendary AP Traveler to the also superb Vixen flourites. I eventually sold all of my 4" refractors, except for THE ---original----- f/5 Genesis. It can do it all, terrestrial viewing, high power planetary and awesome get lost in space wide field views.
So Martin, I certainly hope you land a good one. Either way, please be sure to check back in and let us know what your initial impressions.
A tale of three 'Original" Tele Vue Genesis 4-inch, f/5 fluorite scopes. Each just like the one in Martin's pic with the gravy-coloured case....
1. My friend bought one in about 1990. The high power views of Jupiter and Saturn were outstanding! Full of detail, contrasty.... I don't recall any intrusive false colour... Wide-field viewing, superb. Double stars, excellent. Astrophotography, fabulous (with film, of course....) He still has it and swears by it! So do I! Superb 4-inch scope.
so I bought one. Identical model.
2. My scope was all of the above except for the planetary viewing. Mine was noticeably 'softer' than his. Very noticeably. Just couldn't seem to find good focus. Less detail, less contrast...Side by side with the same eyepiece, same cool-down etc. mine was decidedly inferior. Still was great on all the other stuff and I never was, primarily, a planetary viewer anyway..... I kept the scope for about 5 years.....photography was its only use...
3. Fast forward to the late 2000's. I sold a G11 mount to a fellow that i knew from S. Ontario as well as us both being regulars at the Okie Tex Star Party. He, too had purchased one of these same Genesis scopes and wanted to use it for photography with his new mount. We corresponded regularly after the sale of the G11 because he just wasn't getting round stars in his images. They were always oval.....He tore apart the mount. He bought the newer, high precision worm gear. He fretted over balance and the type of grease and I don't know what else. Oval. Stars.
One night at OkieTex when it dawned on me that i might have to buy the mount back if it wasn't working, I popped by his site and there he was, fussing over the G11 with the Genesis sitting on top. I suggested that he relax for an evening and we would try to split some binaries just for a change. So, at 200x +/- on the very first star I looked and.......the diffraction pattern was oval! Rotate the scope and the oval rotated. The Genesis was astigmatic!! Nothing wrong with the mount! (Good news is that Uncle Al took the scope in and fixed it free of charge.....)
So. 3 of these scopes and two had 'issues'.
And a life lesson for some of you high-end refractor imager-only types who don't even have eyepieces (my friend in #3 didn't). You may be missing some useful information...
p.s. Martin, I like that rug. It really ties the room together....