[LRflex] Re: IMG: The Moon for 6 groschen
- From: David Young <dsy@xxxxxxxxxxxxxxx>
- To: <leicareflex@xxxxxxxxxxxxx>
- Date: Sat, 27 Apr 2013 07:12:40 -0700
Good Morning, Philippe!
When I first looked at your rather good image of the moon, several thoughts
sprang to mind...
1) The detail in this shot, and the admission that it is a "severe crop" tells
me that if you really did get the lens for "6 pence", then you got one heckova
bargain!
2) "Noise" in this image is very well controlled. Which indicates low ISO.
But, low ISO means longer exposures. And it does not matter how sturdy a
tripod you have ... all Lunar/Solar exposures are limited to roughly 340/the
focal length of the lens (in mm) before rotation of the earth causes image
burr.
3) But then I checked the Exif data, which shows a 300mm optic, exposed @
1/40th at f16, at ISO 560.
So, the noise at ISO 560 is a credit to the D700. And 1/40th is well within
the 1.3333 second limit for rotation of the earth. Then I wondered WHAT on
earth possessed you to shoot such a dim subject at f16?
Finally, I checked Fred Espenak's site (Fred is NASA's Eclipse Guru)
http://www.mreclipse.com/LEphoto/LEphoto.html
To find the your exposure is right "on the money", by his exposure guides.
Having photographed many lunar and four solar eclipses, my only question that
remained was: "Why would you not open the lens to say, f8 or f11, thus slightly
increasing the shutter speed (with it's obvious benefits) and avoid the optical
diffraction associated with f16 & smaller apertures?
All of this is "stream of unconsciousness" ramblings. Your result is a very
nice shot! Nicely done!
May I ask which 300mm lens you've acquired?
David.
> http://gallery.leica-users.org/v/Phileica/Angels/The+Moon+for+6+pence-
> 3345.jpg.html
------
Unsubscribe or change to/from Digest Mode at:
http://www.lrflex.furnfeather.net/
Archives are at:
//www.freelists.org/archives/leicareflex/
Other related posts:
