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hi fellow astrobiners, I use the Antlia ALP-T 5nm Dual Narrowband Filter with the 294MC attached to a TS 12" RC truss tube, and I was very surprised to find a halo around a star which is not from the brightest class, its AM Cyg. HIP102732 M-class star its a variable pulsating star with period of 365 days the brightness varying from Mag. 10.763 to 13.185. you cant oversee the star with its halo at center of the image, i was wondering because all the forums mentioned no halos! and yes i have no halos arround brighter stars, has anybody an idea how to debug where this this halo results from? The image is simply calibrated and stacked it contains 10 Lights x 300sec / 10 darks x 300sec / 15Flats. clear skies,  |
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a while ago I posted the image of the halo arround carbon star Am_Cyg. The Antlia Alp-T DualBand Ha/Oiii is leaking Infrared. Since I have imaged R_Cyg. for comparison with UV/IR cut I know the reason for the halo very well. you see: <— left: Antlia AlP-T DualBand Ha/Oiii only —> right: Antlia + UV/IR cut i sent a message to Antlia support if this is a manufacturing issue.   |
