Quote:
Originally Posted by Slawomir
Lots of good advices.
I may just add that I really liked my TS ED 102mm f/7 Photoline telescope - it had a solid 3" focuser and a nice reducer. It came in a double cardboard box with some styrofoam cut-out pieces that well protected the cargo. I did upgrade the focuser though to a 2.5" Moonlite with a rotator. The only reason I sold it, and after long research bought 105mm CFF, was a bit imperfect colour correction of my TS doublet.
The quality of CFF is a few notches higher thany my previously owned TS - starting from impeccable second to none packaging, machined solid tube that won't flex, machined baffles, solid 3.2" FTF and beautiful optics including a substantial dedicated CFF corrector.
Having said that, from my experience with a TS doublet, I am confident that their triplets are also very good and capable for capturing great data. But I'm also glad I splashed a bit more on an instrument that was made with a great attention to detail.
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Quote:
Originally Posted by Atmos
It is identical to the Sky Rover 130mm I'm currently using. TS have been through different focuser designs for their version but have ended up with the same one I'm using now. It used to have an odd M65 or M63 connection but they've since decided to standardise it to the M68.
If you want a telescope that you can use visually, this isn't one for you. It has a back focus of 74.5mm from the M68 thread on the draw tube so unless you get a special very short 1.25" diagonal you'll never achieve focus with an eye piece without laying on the ground 
Due to the way that it is designed, it is technically a F/5 but with the interaction between rear flattener and correct back focus it is a photographic F/5.2 at 675mm focal length. It is a nice astrograph. |
Thanks Colin. 78mm is probably just enough for my imaging train with 6mm to spare. So that is good.
Greg.