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See the link to a morning Sun image taken while at anchor in Smugglers Cove, Santa Cruz Island.

Camera: 10 MP Canon Rebel SLR
Lens: 50mm SMC Pentax 1:2
Polarizers: Vivitar linear

Settings: ISO 200, F22, 1/4000s, Infinite Focus, Manual Mode
Date: 6/18/2010
Time: UT 14:30:23
Temp: 62°F
Press: 1013 mb
H.E. : 7 ft.
GPS La: 34° 01.1'N
GPS Lo:119° 32.4'W

Pixels: 3093 Horizon to the upper limb
Hs by graph: 3093 x .3749=1159.6'=19°19.6' (int 0.4'T)
Hs Tschudin Formula: 3093x.371+12.4=1159.9'=19°19.9' (int 0.7'T)
Hs Huxtable Formula: 120xARCTAN3093/18161.8=1159.8'=19°19.8' (int 0.6'T)
Az: 74.0°

Digital camera CN summary

Pros
1. Accuracy close to that of a metal sextant.
2. Automatic UT time stamp of image.
3. Very quick observation time.
4. Light weight and compact.
5. Observations saved to laptop.

Cons
1. Not waterproof.
2. Only good for day time Sun and Moon observations up to 24°.
3. Precision 0.4' vs 0.1' of a sextant.
4. Requires editing on a laptop.

Conclusion

Digital camera CN is an intensely interesting way to obtain a Sun or Moon LOP with the bonus of improving photo editing skills.

Greg Rudzinski

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