Hi All: Recently I purchased a FS-102 new (after an 8 year astronomical hiatus) and I am not sure if there is something wrong with the optics. Using a different selection of eyepieces (University Optics 5mm, Early 90's Celestron 30mm Plossel, 90's Televue WF 26mm), the focus seems not to "snap" in place confidently, instead there seems to be a very tiny range of ambiguity where I am wondering if I have reached focus. I find myself toggling in and out the focuser and repositioning my eye. At one end of the range, the stars are very sharp but laser-thin elongated. On the other end, they can be "spikey". Looking at Jupiter, I detect a blue fringe on half the circumfrence and a red fringe on the other side. Looking at Sirus, the out of focus image appears a little oval. I don't seem to remember this feeling of being a little worried about the optics 10 years ago when I bought a Vixen 4" fluorite. I remember a more "snap into place" kind of focus. Anyone with an opinion as to how I can proceed to diagnose the problem? Can my new Televue Everbrite star diagonal be out of collimation and be causing this problem?
Thanks, Ivan
Thanks, Ivan
