The
Moon and Saturn
With our DMK41 CCD Color Cam
July
25, 2015
About
once a year, I try my hand at imaging Saturn. As you know from
many of my past attempts, the seeing here in Payson is always
very poor and this type of high magnification imaging has never
been my forte. But I still try! Last night, we had a break in
the dense monsoon cloud cover that is prevalent this time of
year in the High Country, and the moon and Saturn were about
5 degrees apart in northern Scorpius. Normally, I do lunar imaging
with a DMK51 black and white for the best resolution. Tonight
- I thought that after trying to get some color shots of Saturn,
Id go for a few shots of the moon. The color cam will have about
half the resolution of a standard CCD, but Im pleased to say
this result here is better than I expected. White balance for
all lunar and Saturn pictures was on the Lunar Highlands, which
is a nice neutral gray color due to over pulverized basalt rock.
All images are full size - which for this camera is 1290 x 960
RGB. |
Saturn
- 2.5x Televue Powermate with the 12.5" f/5 Newtonian
| in |
Saturn
- 5x Televue Powermate. (stop laughing!)
| in |
Moon
- Prime focus at 62.5" FL Next few images
| in |
| in |
| in |
| in |
Moon
- same region as above, color enhanced to show shades of browns...
| in |
Moon
- 5x Powermate. Next two shots.
| in |
| in |
Conclusion
- This camera can do a fine job on the moon with a neutral color
balance. BUT the noise is huge, and no amount of processing would
result in an acceptable image that did not look plasticy. The
camera is extremely slow with its Bayer mask over the chip. I
had to do both 1/15 second exposure and turn the gain to the
absolute maximum of 1000 to get any image at all of Saturn at
5x. |
Processing:
50/1000 best frames, alignment in Autostakkert, Wavelets in Registax,
Levels and Contrast Masking In Photoshop CS2, |
Instrument: 12.5" f/5 with 2.5x - 5x Barlow
Platform: Astrophysics AP1200
CCD Camera: Image Source DBK41 USB
Filter: None
Exposure: Varies sec 15fps
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing 3/5, Transparency 7/10
Outside Temperature: 75F
|