QHY600M and Flats

[Bfialkov]

Hi

Previously on a different camera (OSC) i did Flats and they seemed to be in the 10-20second range per flat

My new QHY600M using the same light source (Alnitak Flat Man at 255) as before, but now mono has me doing Ha and SII flats that are in the minutes and OIII in the low 10s mark

I'm aiming for an ADU of 30000 (Is this correct)

Is this normal to have such long flat files?

Cheers

[The_bluester]

I can't comment on specific flat times, but NB filters will pass a lot less light overall so flat times would be longer.

HA and SII are fairly close together in the spectrum, maybe the light source is not particularly strong around those wavelengths?