No, light path is definetly much more than 118mm!
Its much larger than even very long BinoVue.
Prisms are not changed (still very big fingernails).
All in all, its much better value IMO than new Baader unit.
Only advantage of Baader is, much less light path taken.
Yes, light path length is always an important issue and if they did not use T2 threads, that is a very serious omission, though I would think that once the thread is known, someone like Rafael at RAF Camera will start providing T2 adapters the way he does for Orion, WO, and Arcturus BVs.
While the TS web page suggests that most of their scopes have enough back focus to reach focus with this BV, I have my doubts, and that is especially true if the light path is more than 118.5 mm, though they say that this is what it is, and for now, I would have no reason to challenge that, but in general, most refractors out there today are not going to reach focus with this BV even if it is T2 ready.
And if the purpose of buying a big prism binoviewer is to get a bigger true field, then if you have to use even a 1.25x GPC, you won't really have an advantage over a short light path BV that can reach focus without a GPC.
But the price is very compelling, and if it really is 118.5mm light path, I suspect it will pose serious marketing challenge to the Maxbright II. It checks the self centering diopter, user collimateable, and big prism boxes, and that is a lot of product for the price, but even if it is only 118.5mm, I don't think I would have enough focus travel to reach focus a 1x, and if I can't do that, I am not interested and will continue using my short light path Orion.
If one is going to have to use a 1.25x GPC anyway, then yes, this could be a great deal.
Edited by Eddgie, 16 October 2019 - 11:54 AM.