I have really been struggling to solve a problem that I've been having with reflections of the Sun floating around in my field of view when I use my double-stacked 60mm Lunt with 12mm blocking filter. Most of the time (like 99% of the time), I use my Lunt zoom eyepiece at its lowest power setting (21.5mm). When I get my eye positioned just right where it's most comfortable for me to observe, I get a really annoying reflection of the Sun floating around in the field of view. If I move my eye in or out, that reflection either spreads out (making the field of view glow with the glare of the reflection) or shrinks. It's really frustrating.
I don't know if my problem is the zoom eyepiece (poor anti-reflective coatings? poorly chosen optical elements?) or some element in the blocking filter assembly that's causing a reflection. I've toyed with the idea of getting a very high quality Tele Vue Plossl (25mm or 20mm) with better coatings, but I hate to be throwing $100+ at a trial-and-error approach to solving this problem. I have yet to try using an inexpensive neutral density filter (GSO ND96-0.3 50% transmission filter) that I have on hand. I also wonder if adding a single polarizing filter would help reduce glare/reflections.
I've tried all of my eyepieces at the 20-25mm range, and I've settled on the Lunt zoom eyepiece as being the overall best one in terms of overall comfort and having the ability to change magnification as need be. But I really want to solve this problem that I'm having with reflections. I don't recall this being an issue when I used my Lunt zoom eyepiece with my 50mm double-stacked Lunt with 6mm blocking filter before I traded it in for my 60mm.
This topic is somewhat related to the "Best eyepiece for Lunt 60" thread that started yesterday, but I think it's different enough for it to warrant its own thread.