Howdy
Hows this for a long exposure. A SINGLE 1 hour image of SNR RCW 103 thru the 7 Nm HA filter last year, a dark was also done and subtracted.
What amazes me is that DSLRs can operate at all at room temp. It goes to show if they could be cooled down to same temps as dedicated astro cameras theyed eat them for breakfast regarding dark noise.,
See Terry's results here
http://www.pbase.com/terrylovejoy/da..._a_closer_look
Quote:
Readnoise = 5 e- RMS
Noise in 900 sec exposure @ 31C = 34 e- RMS, dark current = 0.5 pAcm2
Noise in 900 sec exposure @ 6 C = 6 e- RMS, dark current ~ 0.01 pAcm2
For comparision STL-11000M has claimed dark current of 0.1 pAcm2 @ 0 C
|
Now imagine if the DSLR can be cooled, like this one
http://www.centralds.net/en/index.htm
The difference it makes is astounding.
Scott