Alun,

#579434
Jack Martin
Participant

Alun,

Attached last nights calibration frames taken around H alpha line.

Far right double line with belt on, collimator screws loose to allow belt to rotate lens, same far right single line with belt off, collimator screws tightened and focused.

Any thoughts as to why only 1 calibration line is double and what’s causing this ?

Regards,

Jack

Essex UK