Quote:
Originally Posted by alpal
Hi David,
that's a great start.
I read that the IMX455 sensor has about 72% QE efficiency
at the 656 nm Ha wavelength which is very high.
https://www.qhyccd.com/uploadfile/20...5055202120.png
Why did you chose 5 minute exposures?
I'm not familiar with CMOS cameras.
Is there a problem doing longer exposures with CMOS?
I found with my QHY9m CCD that a 20 minutes exposure
was an ideal amount of time when using Ha.
cheers
Allan |
Thanks Alan,
It was more of a testing weekend. The wells on this camera are relatively deep, so I’ll definitely be trying longer exposure. That said, there is a trade off with CMOS between exposure duration and read noise that means you do well with relatively short exposures compared to CCD - I don’t fully understand that, a bit like my lack of understanding about gain, offset and readout mode. Many “knobs to twiddle” and much to learn!
DT