Erik68
June 8th, 2022, 08:11 AM
I knew there were some dusts, but I did not know their exact position. Without the filter, there was no sign of IFNs.Only when I used the CCD B filter, I could detect it.
refractor 152/760
25x +Baader CCD Filter Blue Interference
NELM 6.4mag.
transparency - excellent
4738
refractor 152/760
25x +Baader CCD Filter Blue Interference
NELM 6.4mag.
transparency - excellent
4738