Is it a TSA120 issue? The TSA102 I have with the very same starlight focuser you have Paul reaches focus with all of the Televue ethos line and at least one of the Delos. Now I am using the Tak 2” diagonal and not my AP diagonal. So that might be the difference.
Btw I believe this is the piece you’re looking for
Gerald - Its a TSA120 "issue" in the sense that for the TSA120 to come to focus, you need to use an extension tube(s). TAK provides two of them with the telescope. These thread into both the stock TAK focuser and the FT with the 72mm endcap.
According to my conversation with Darren at TNR two days ago this part is no longer available. It was made by a local Houston, TX machinist for TNR. Its not a stock item made by Takahashi Japan. I think I purchased several of them for my Sky90.
The 3" Feather Touch with M72 endcap for the TSA-120 has exactly the same length as the original Takahashi focuser. So the Takahashi system chart applies here as well.
Correct. But for visual use without a binoviewier, you must use the provided extension tubes. I get lost in the system chart. To me, the system chart is more for the astro-photographer. My needs are simple.
Perhaps I am not being clear so let me state it more plainly: I do not like the Takahashi extension tubes. They are weak compared to other offerings and do not have compression fittings. My premise my original post on this topic was to look for alternatives to using the TAK extension tubes. And, thanks to RAKing, I have found them. I received yesterday, from Astro-Physics, a full set of threaded extension tubes of various sizes that I can mix/match to my liking.
Edited by peleuba, 26 June 2020 - 06:56 AM.