![]() I'm going to shut up now, as I'm talking myself into buying one! All the Messier objects Infact were a pure joy in the 6", so if fuzzies and comets are where your main interests lie, then I doubt you'll be disappointed by a 6" F5 doublet. The bridging arm of M51, linking the main galaxy with the satalite galaxy was detectable, as was the spiral structure of M51 itself. Even globulars and galaxies were quite spectacular in the 6". One evening at my local astro club, one friend brought along his 6" F5, and although there were a great many large reflectors, Schmidt Cassegrains and a Maksutov Newtonian on the field, nothing could compare with the 6" F5 achromat when it came to beautiful star fields and open clusters. ![]() The F8 was perhaps just a tad better on the Moon and planets but both would play happily at 250X. I bought the F8 version so as to get better colour correction, but in all honesty, the difference between the F8 and F5 was negligible. All four scopes were simply superb as visual deep sky instruments. When they first came out back in the late 90's, I bought the Helios 6" F8 while three of my friends bought the Helios 6" F5. How durable is the focuser? What material is used for the lens cell - is it cheap pot metal or a little better aluminum? Both of these are not good for constant collimation screw adjustments and I wonder how the lens cell holds up in this respect. What I'm also interested to know is how good the quality of this achro is. That's of course again those people who like me are perfectly fine with the CO. I know it's strength is wide field views but I've heard people used them as a high power instrument for planetary observations as well. I've seen many reports that 6" achro comes close to both 8" SCT and 8" Newt (of course with certain limitations). What I like about it is of course its light gathering power which no one can deny. Being on a budget I'm going to use it as a general purpose scope, for everything. I'm not too sensitive to CO, to say the least. ![]() I know its most significant drawback, the CO which is a curse of any achro and particularly the short models. Please comment on your experience with the short refractor from Bresser, the AR-152S model. ![]()
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