Thanks for this info. Can you elaborate a bit on how the TSO’s FR/FF doesn’t attach easily using the 2020 model? I plan on using the following cameras Nikon Z6 (Full Frame), Nikon D5500 (APS-C), and ASI2600 (APS-C). I guess ideally I’d like just one FR/FF that can handle all of the cameras.
Check out my Esprit 100 FR thread:
For the Esprit 120, you will need to check how much backfocus it has, but it looks like for the Esprit 100, the NEW TSAPORED075 does not have enough to get it to fit. My experience is similar to RossW on the Esprit 100, the focuser is out only ~7mm when using the TSAPORED075.
Posted 18 August 2020 - 07:12 PM
The original TSAPORED075 definitely works and works well. I also noticed TS have unfortunately "upgraded" the TSAPORED075, because it now has M88 male and M82 female on the scope side. I don't think there is much room to adapt that to M68 female for use on the Esprit 100. I only have 8mm of focuser IN travel available when using the TSAPORED075 and if any of that is reduced by using an M88-M68 adapter there may not be enough IN travel available throughout a full summer-winter cycle.
I use the TSRED379 on my TS 130 f/7 and it is a nice reducer too, but only 0.79x reduction so the FOV would be slightly reduced. You can also use the Riccardi 0.75x but you need to manufacture an adapter that allows it to fit inside the focuser drawtube, because apparently if used externally you will not be able to reach focus.
If you prefer the 0.75 reduction your best bet might be to obtain the original TSAPORED075 second-hand via TS.