DSLR-Cooled Vs Not Cooled
A Basic Comparison between the
Standard DLSR Vs a Cooled Version 10 minute Exposures
This isnt really a
report, but simply a basic comparison to show what the
visual performance difference between the Hutech Canon 40D
(Standard DSLR with modified astronomical filter) and the
Central DS Canon 40D (Peltier Cooled DSLR with modified
astronomical filter)
Before I go ahead,
central DS have already provided a sample of images with and
without their cooling option employed:
http://www.centralds.net/en/index.htm
Note: this site has
excellent developmental information of their design, which
is interesting reading.
The following images
show the difference between the:
1. Hutech
Camera: one 10 minute exposure following a string of four
[4] previous 10 minute exposures, ISO1600:
Click on for larger view (Right
side - centre)
2. Astro
40D: one 10 minute exposure following a string of four [4]
previous 10 minute exposures Cooling OFF, ISO1600:
Click on for larger view (Right side -
centre)
Interesting to note, that even with cooling turned off,
image thermal noise is still better than the standard
3. Astro
40D: one 10 minute exposure following a string of four [4]
previous 10 minute exposures Cooling ON, ISO1600:
Click on for larger view (Right
side - centre)
Another interesting item
I noticed was that the file sizes (not dimensions, nor pixel
size being different) were increasing in size with increase
of noise (data). The following jpeg image sizes where
experienced:
-
Hutech Camera: one 10
minute exposure following a string of x4 previous 10
minute exposures: Size 11,756 kb
-
Astro 40D: one 10
minute exposure following a string of x4 previous 10
minute exposures Cooling OFF: Size 6,901 kb
-
Astro 40D: one 10
minute exposure following a string of x4 previous 10
minute exposures Cooling ON: Size 2,778 kb
There you go!
Cheers,
Steve Mohr
