I have the LS50 with the 600 blocking filter and the optional double-stack module. It is my first solar scope and I am really enjoying it with the Lunt zoom eyepiece.
I am also trying to answer the question of whether the LS50 will work with a binoviewer. When I asked Lunt this question, they told me the following: "I am sorry you will not be able to have a binoviewer reach focus with the LS50T. The scope was not designed for use with a binoviewer. It is more of a beginner scope. If you are interested in binoviewing you will need to step up to the LS60THa scope."
However, in email conversation with Harry Siebert (http://www.siebertop....com/index.html), he does appear to have a binoviewer solution that will work with this scope. It looks very promising to me so far. I would also purchase another Lunt zoom eyepiece so that I have a pair to use with the binoviewer. I also contacted Denkmeier and they say they have a solution for this scope also. However, the Siebert Black Night plus their 1.2x OCA is a less expensive solution so I am going to pursue that. I haven't checked with EarthWin to see if they also offer a solution, but I plan to do that too.
If you also plan to use a binoviewer with another scope for night-time viewing, for example, then that would obviously influence your decision about which binoviewer would meet your needs for both scopes. I would like to use a binoviewer with my C-14 Edge scope as well as the Lunt, so that will factor into any binoviewer purchase I might make.
While the Siebert solution is more expensive than the Baader Maxbright, for example, it does appear to me that the Siebert solution will allow the scope to achieve focus with his binoviewer (with 1.2x OCA) right out of the box. With the Maxbright, I don't think even the 2.6x Glass Path Compensator (GPC) would provide enough "in-focus" with the short-travel helical focuser on the LS50.
Here is the discussion I started about this question in the Binoviewer forum: http://www.cloudynig...ha-solar-scope/
As to the questions of how the weight of the binoviewer will affect the scope's balance and put any strain on the diagonal or focuser, I cannot yet answer these questions. However, I am looking at swapping out the Lunt helical focuser (which is the only part of the scope I don't like) for a smoother-operating Borg helical focuser (model 7315).
I would be really interest to hear from anyone who is successfully using a binoviewer with this scope. I would also encourage you to do your own research just to make sure you are making the right decision for your needs.
Edited by saguaro, 08 February 2015 - 12:05 PM.