imaging at -15 would -12 darks be ok

[iwols]

hi just about to start a dark library, but can only cool ccd to -12 at the minute ,i image at -15,is this a problem?

[Davey-T]

12 minutes ago, iwols said:

hi just about to start a dark library, but can only cool ccd to -12 at the minute ,i image at -15,is this a problem?

Should be OK guess you can only try and see, some software that reads the temperature from the Fits header may refuse to use them if the temperature doesn't match the lights.

Some software can scale calibration frames to match.

Dave

[iwols]

thanks just managed to get -13.7 with door open,might wait till tonight when temp drops to be sure?