I got an Esprit 100 last year after only about 3-4 months of trying AP with my ES ED102CF. I love the Esprit and it is massively better than the ED102CF, with a MUCH better focuser and better glass (w/o the CA of the ES).
I like the Esprit's FL much better than my ED102 (which is very close to the TS 107), as many more nebula targets fit. I think 700mm FL is more a tweenier FL, with most nebulas needing a shorter FL, and most galaxies needing a significant longer FL. I got an EdgeHD 925 w/ 0.7x FR for the small targets to compliment my Esprit 100. Most of my nebula shots on the Esprit use a 0.75x FR for a 413mm FL and fast f/4.13. For very large targets, I use even shorter FL camera lenses, such as Canon EF300 f/2.8L, Canon EF70-200 f/2.8L, or Samyang 135mm f/2.0. I mainly image with my ASI183mm-Pro, which is relatively small with 2.4u pixels. With a larger APS-C sensor, the Esprit 100 at 413mm could fit larger targets, such as M31, and only the very largest, such as entire Cygnus Loop/Veil Nebulas or combined Heart & Soul Nebulas, needing camera lenses. With the Esprit 100 or another scope of 80mm at f/5 to f/6, I do not see a ~700mm FL scope fitting into my imaging goals. I could make a case for an Esprit 120 (at f/7) or a 130-140mm f/7 scope.
The Esprit is considerably faster than the TS 107, which a big plus, and the Esprit's have a VERY good reputation.
My decision was between, Esprit 80, Esprit 100, and Stellarvue SVX80T-3SV. I picked the Esprit 100 over the Esprit 80, for the following reasons:
1) the Esprit 100 has a much better way of attaching to a mount, with solid rings and Losmandy rail, instead of the Esprit 80's integrated Vixen foot. Besides having the more solid Losmandy rail, the rings allow for a much more secure way to a guidescope, e.g. add a small Vixen rail on top and attach the guide scope on top; MUCH better than attaching the guide scope to the small finder bracket.
2) With a FR/FF, the Esprit 100 is basically a faster, higher resolution 80mm. I use the TSAPORED075 for a 413mm FL at f/4.13. Riccardi has an equivalent FR/FF, and Starizona has an even more extreme 0.65x. This gives me two different FLs, 550mm or 413mm, depending on the target.
3) Esprit 100's focuser is more robust, and is the same as on the Esprit 120 and 150.
4) Esprit 100 image circle is 40mm vs. the Esprit 80's at 33mm.
With the Esprit 100 and my ASI183, I can image at 0.9"/px (native 550mm) or 1.2"/px (w/ 0.75x, 413mm).
I picked the Esprit 100 over the Stellarvue SVX80T-3SV, because it is faster, and I preferred its FL, especially with the 0.75x FR/FF. Also, Stellarvue increased their price by $300 in late 2018, its availability was sketchy, and I got a very good price on a new Esprit 100 for only $100-$200 more than the Stellarvue SVX80T-3SV.
The Esprit 100 is built like a tank and is heavier than most 100mm scopes, but a EQ6-R should handle it fine. I think the EQ6-R is about the minimum mount for an Esprit 100. I use a G11 mount, which is a piece of cake.
Edited by SilverLitz, 01 July 2020 - 03:17 PM.