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Subject: Re: vote by atlanticp95 By: Anonymous (xxx.xxx.223.11) Date: 10/23/2003 02:34:35 pm PST >Taks and APs are just like cars. Take a Ferarri for example, and a Mazda Miata. The Ferarri is 10x the price and people buy it for the name and obvious performance. But you can drop a $10,000 upgraded engine in the mazda and it will beat the Ferarri. So why don't people buy suped up Miatas? Because its all about the title. Likewise, this Mak-Newt (Miata) out-performs any 4" APO. I understand your concept, but there is no way 10 thousand dollars will make a little miata a ferrari eater! HA!! Maybe a better example would be dumping a balanced and blueprinted big block into a camaro... Subject: Re: vote by xxx.xxx.234.249 By: Anonymous (xxx.xxx.1.115) Date: 05/05/2004 02:32:39 am PST > Stars focused through most of fov - extreme edges show coma but - hey - its an f/5 fast mirror. The MN56 is not f/5, it's f/6. This reviewer repeats his "f/5" error several times in his report. > The fast primary mirror makes pinpoint stars across entire fov through edges impossible - but with proper cool-down it's only apparent at very edges. They're not comets or anything gross - they just go out of focus as you near the edges. That's why I gave the optics only a 9 rating. Sounds like field curvature and/or astigmatism/coma in his *eyepieces*. Maks are reknowned for wide _flat_ fields. The official specs of the MN56 include: -- photographic field = 13.5 mm diameter; -- spotdiameter at edge of photographic field = 11 micron. This is superb sharpness at a considerable distance off-axis. It would have to fall apart completely, further off-axis, at a rate faster than coma becomes apparent in normal f/6 Newtonian paraboloids, to match the decription given by this reviewer. I doubt that could be the case, so I would suspect the eyepieces or collimation, rather than the telescope optics themselves. Subject: Re: vote by xxx.xxx.162.101 By: Anonymous (xxx.xxx.82.213) Date: 08/14/2008 12:35:16 pm PST >Just finished extensive testing. >Epsilon Lyrae double-double cleanly split at 100X with black between stars. >Several large and small globulars resolved. >The disc of Uranus clearly seen at 400X-but no detail. >M51 spectacular with spiral evident when using averted vision. >My CG5 mount is a perfect match. I use Vixen motors and controllers-the celestron motors and controllers are weak and poorly constructed. >Contrast is very high. Helical focuser is sturdy, precise, but clumsy at first. >My 4 inch APO is now gathering dust in the corner You can make out spiral structure in M51, with averted vision, with a 5" aperture??!! Where (and how dark a place) in the world are you viewing from? I still haven't had my 12" somewhere dark enough that I could more than barely discern spiral structure in it... Page 1 of 1 |
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