TS-Optics GSO 6" f/12 Cassegrain telescope 154/1848 mm OTA

Written by Valeriy Uspenskiy
on 2021-02-24

Guten Tag. Bitte senden Sie mir eine E-Mail (red-marksman@yandex.ru) bedienungsanleitung und Kollimation dieses Teleskops. In der Verpackung dieses Teleskops gab es keine Anleitung. Im Voraus dankbar. Ihr Käufer.

Written by Fedotov Mikhail
on 2020-10-19

12 days delivery time to Moscow - super fast.
The tube itself is heavier than expected - with CG-4 mount suitable for visual observation only, even with anti-vibration pads the vibration on high mags take several seconds to subdue, for astrophoto - EQ5 is what you need at least, AVX will be optimal.
The optical performance is superb - star test reveals no significant aberrations or defects, pre-focal and after-focal pictures are identical, the optics are diffraction limited. Holds 2x magnification very easy (even easier than my SW DOB 8) - very sharp and detailed image on 308x. A true planetary scope.
The build quality is mediocre - half of the screws were loose, make sure you have checked every one of them before using the scope. Also the tube arrived completely out of collimation, such misalignment can´t be blamed on post alone, the tube wasn´t collimated prior to delivery.
Collimation is relatively easy. Trickier than on newtonian since laser collimator is useless, easier than on refractor or RC.
The focuser is smooth and precise, and you can rotate it 360 degrees - very pleasant to use on equatorial mount.
The biggest advantage of this cassegrain (next to image quality) is its open design and quartz optics - cooldown on 20 degree temperature difference takes roughly an hour - super fast compared to maks and SCs of the same size.
The main drawback is the sizing of spacers for visual use - 2" + 2" diagonal mirror is too long for 40 mm WO SWAN eyepiece, 1" is too short for everything else I have. 1.8-1.9" spacer would be just perfect.
The seconday obstruction is noticeable - stars in focus have that circle around them, and planets have a glowing orb. The secondary mirror wanes are also quite thick - bright stars have 4 spikes with brigtness higher than I would prefer.

But considering the price of 340 EUR all that is forgiveable. All in all - a great planetary and grab&go machine.

Written by Stephan Tomm
on 2020-07-22

Teleskop bestellt, sofort versandt (war auch DHLExpress - war es mir wert, da die Pakete ordentlicher behandelt werden)
Glücklicherweise direkt am ersten Tag first light gehabt. Bildet die Sterne schön knackig scharf ab. Bei seiner Bestimmung, der Planetenbeobachtung, klappte es auch schon sehr gut. Leider war das Seeing schlecht.
Die Verarbeitung ist sehr solide, lediglich die Staubschutzkappe sitzt sehr locker.

Einen Zacke vom 5. Stern muss ich leider abziehen, da die momentane Mehrwertsteuerreduzierung nicht weiter gegeben wird!