What about using a H-Alpha filter? ( trust me, this is not pretty for the CMOS). PW quote
Bert comment
Really? Canon 5DH at only -4C environment. The sensor would have been a few degrees higher than this! To be fair I only gave it 4min exposure at an ISO of 1600 as opposed to a paltry 30 sec. If you can go three times as much in time then eight times has no consequence in any comparison? It is less than thrice as biased!
http://members.optusnet.com.au/~trlee8/hafl.jpg
It is truly sad is it not? The general background shows variation in intensity and this must be due to the lack of sensitivity!
If as you say you cannot take exposures with a 5D longer than 30 sec, you have no hope of doing a fair evaluation. I even doubt your ability as you said yourself you could not be bothered guiding!. Shirly a timer is easily available for the Canon 5D? It is pointless to put this meaningless 'comparison' anywhere until you can do it objectively!
Drivel about a lack of resources smacks of bias or at best incompetence.
I won't waste any more time. I have better things to do.
The sad thing is a fair comparison would be very informative.
Bert