----------------------------------- rem01 18 Oct 2013 14:29 Sfat achizitie colimator laser ----------------------------------- Salut, Ma gandeam sa cumpar un colimator laser pentru SCT-ul meu (Celestron C6). Va rog sa imi spuneti daca e recomandata (precisa) colimarea cu laser pentru SCT sau mai bine cea clasica cu stea. In manualul de utilizare pentru Baader Planetarium MkIII 1.25" Laser Collimator spun ca acest tip de colimare este precis doar daca fasciculul laser cade fix in centrul oglinzii secundare... A word of caution when collimating SC’s and other Catadioptric OTA’s: In any Newtonian telescope it is a commonly accepted procedure, to mark the center of the primary mirror with a small circle, before attempting collimation. It is “The“ most important action in order to ensure control over the process of collimation (Aristotle’s: “Give me a fixed point in space and I will unlatch the earth from it’s path“). In terms of an SC-optical system, this would mean to mark the very center of the convex secondary (!) mirror, so as to ensure the laser beam stays within the rotational center of the optical system. The downside is that most visual back accessories in present day SC-OTA’s are made so sloppy that the precondition mentioned above will not be met. Even with the best tools – a sufficiently sharp and well adjusted laser beam with a precision chrome sleeve, you must ensure that the laser will hit the SC-secondary dead center, so that the reflected beam will truly indicate the offset of the secondary adjustment, rather than the offset from the secondary’s center. Putting a tiny center “ring“-mark onto a secondary is not a difficult task, when the SC-OTA has a provision to quickly un-mount the secondary mirror – such as it is the case with CELESTRON’S FaStar-Optics. The procedure is essentially the same, as described earlier for the center mark on a Newtonian primary. In any case – if you do not feel happy with marking the secondary mirror of your telescope, please stick with the “real star“ collimation techniques as described in the manual of your Schmidt-Cassegrain telescope. We cannot take any responsibility for damaged optics sets due to careless or otherwise wrong optical handling. LASER-COLLI Instruction Manual 2005, pagina 11 Multumesc, Romulus