Hello to all CloudyNights members,
It is my first forum post. I am a bit embarased as I my English not so good, as it should to be.... but I got small issue with recently purchased from LUNT H-alpha filter and hope that you will understand me and could give me a good advice. Thanks in advance !
My setup. Set of filters ( LS60FHa plus B1200d2 blocking filter ) is attached to SW ED80 telescope. In general all seems OK, and I can get more or less normal view of prominences plus can see granular structure of the sun surface same time, but... what seems strange - I don't know if this picture is best or may be it can be improved - because yellow metal tuning rim on the etalon filter appears to be already at it's edge position. Actually it means, that I can't adjust quality of the picture. Just by turning rim to it's edge position can approach to some more or less good sun shape in my eyepiece.
What could be a reason ?