[LRflex] Re: IMG: The Moon for 6 groschen
- From: philippe.amard@xxxxxx
- To: David Young <dsy@xxxxxxxxxxxxxxx>, liste reflex <leicareflex@xxxxxxxxxxxxx>
- Date: Sat, 27 Apr 2013 18:22:01 +0200 (CEST)
Message du : 27/04/2013 16:12
De : "David Young " <dsy@xxxxxxxxxxxxxxx>
A : leicareflex@xxxxxxxxxxxxx
Copie à :
Sujet : [LRflex] Re: IMG: The Moon for 6 groschen
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!
http://tinyurl.com/cas9umw
In fact I had got it for that price shipping included ...
2) "Noise" in this image is very well controlled. Which indicates low ISO.
Standard ISO is up to 1600 on the D700, a real treat.
Higher than than you can rescue a shot by means of the NR sliders in LR.
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.
I have a few misses in the series, F32 @ ISO 50 and 30 sec for instance ...
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.
It was by my backscreen too ;-)
Thanks for the link all the same.
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?
I'm a lazy photog David, this you know. I experimented though, and found I got
better results with this makeshift long lens at smaller apertures, that's why.
The lens opens @ 5.6 when at 300. So f16 is only a few stops away.
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?
See link above. Yet, I bought it two years ago, cheaper than what Leitax was
asking me for an adaptor mount for the angenieux. I was in a rush prior to
leaving for Lituania if I remember well. I had decided to sell it on my return
but didn't as I found it was light, offered auto-everything except VR and
allowed me to reach 300mm vs 210. that's the story.
When I reconsider my gear it will certainly go along with the nikon glasstic I
currently own :-)
OTT: We left for a couple of days and returned yesterday to find our cat
missing ... We've printed letters with a photo and slipped them into the
letter-boxes in the neighbourhood this morning. No call so far and Alice is
getting VERY nervous :-(
Amitiés to both Rose and you.
Philippe @ Mutzenhouse, rainy Alsace
David.
> http://gallery.leica-users.org/v/Phileica/Angels/The+Moon+for+6+pence-
> 3345.jpg.html
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