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To: NorthMountain

A guy on an astromony club page posted the following meta data associated with the picture:

f/4, ISO 51,200, and 1/4 second, on a Nikon D5 with 22 mm focal length.

No Hasselblad anymore.

That meta data would work out to half (0.512 times) the light grasp of the Sunny f/16 rule, assuming the moon was 400,000 times less bright than the sun, and ignoring the two-loss way through the earth’s atmosphere. It also implies a field of view of 57 x 80 degrees in the camera.

0.512 times is one f/stop, going from f/4 to f/2.8.


68 posted on 04/03/2026 12:08:54 PM PDT by Lonesome in Massachussets ( Thorough planning and careful preparation is no substitute for wishful thinking. )
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To: Lonesome in Massachussets

Quarter second seems to match the slight motion blur of the lights. It’s the first NASA APOD that I have downloaded and saved. Very impressive. To me, anyway.


73 posted on 04/03/2026 2:29:22 PM PDT by NorthMountain (... the right of the people to keep and bear arms shall not be infringed)
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