Samsung Pro815

 

1 stop bracketing the moon...

I'm testing a Pro815, dutifully bracketing +- 1 stop. I'm using default fine jpg.


ISO 100 f8 1/100


ISO 50 f8 1/50


ISO 100 f8 1/400


ISO 50 f8 1/200


ISO 100 f8 1/200


ISO 50 f8 1/100

Using RAW, the next night, a waning gibbous, the results are a lot better:

The above image settings:  ISO 50 f8 1/100.

I need to bracket much wider to see the limits... watch this space.

Is the moon the right size?

Does all the maths add up?

In the above images the zoom set to longest length - 420mm equiv. (104.7 true is stored in the image meta data.)

Moon image diameter in the above images is 346 pixels. Pixels across sensor 3264 (36mm equiv axis.)

Diameter on 36mm equiv sensor is 36 * 346 / 3264 = 3.816mm

tan A = opp / adj. = 1.908 / 420 = 0.004 = 0.26 * 2 =  0.52 (Which is about right!)

f11 Rule

The camera's smallest aperture is f8.  

The lunar f/11 rule says shutter speed is 1/ISO at f/11.

Links

compare with Canon D30

Samsung Pro815 Review

Waning Gibbous   ... and another waning Gibbous!