Reply To: Bias Frames for CMOS

Forums Photometry Bias Frames for CMOS Reply To: Bias Frames for CMOS

Dr Paul Leyland

I think it means dithering may have become an essential but the saved readout time over a night may balance out the need for more frames.

If the FWHM of the stars is several pixels, poor focus, seeing and minor guiding errors will do much the same as dithering for free.

Many photometrists defocus slightly for exactly this reason.