I have a Lunt LS60 PT purchased used here on CN a few years ago, and while it's basically fine, beautifully made, and seems well cared-for, I've always wondered if the sweetspot is optimal -- and if not, can it be improved, e.g. by Lunt repair.
I contacted Lunt a while back, but no response -- I assume they don't want to support used items unless it's maybe a repair request, which is fair enough. However, I'm still curious if the sweetspot performance I'm seeing is "normal". It seems narrow/small to me, but the only H-alpha experience I had before this was on a little PST. I do have a Quark now, but I'm still getting used to that and I'm not sure that's a valid comparison anyway.
So here's a schematic of the "eye shape"/lenticular form of the sweetspot I'm experiencing -- which moves laterally (per arrows) when I adjust the pressure tuner. This shows the approx proportionate size of the sweetspot I'm seeing and the solar disk.
You'll note it's a lot smaller than the full disk. I see people post pictures of clear whole disks all the time, but I can only ever get part of the disk clear with my setup. Is this normal? Are the whole disk people just getting lucky with large sweetspots? Could mine be improved? Thanks for any insights!