Peter I used to have a Baader filter that I made by myself and I used it on a 90mm Meade ETX. It was great for seeing sun spots but very little else.
I sold the ETX long ago and now have a LX90 and was wondering aloud about how a new Baader film could be made on the LX90 and also wondering aloud about the benefit of a PST. My wonderful wife then got the message and bought me a PST! It is great for seeing some of the granulations and other solar features. However we are in a solar minimum and there is not a lot of activity up there. Nevertheless I enjoy a bit of time looking at prominences etc. But as of late there has been no sign of sunspots. On that note I would recommend that you stay with the solar filter that you have for sunspots as they are seen better with that type of filter. I've since bought another (2nd hand) 90mm ETX and bought a Thousand Oaks filter for it. (Bit of a rip-off as there are really only 999 Oaks!
) Just waiting for some sunspots now!
)
So I would recommend a PST even though they are a bit pricey but the next step up is even more expensive.
Cheers!
Popeye