【在 S*M 的大作中提到】 : Ansel Adams moonrise was taken around sunset or shortly after sunset : I dont think GND existed back then. It was more of a dark room trick
这是wiki上说的: The photograph's fame was probably enhanced by Adams's description in his later books of how it was made: the light on the crosses in the foreground was rapidly fading, and he could not find his exposure meter; however, he remembered the luminance of the Moon, and used it to calculate the proper exposure. Adams's earlier account was less dramatic, stating simply that the photograph was made after sunset, with exposure determined using his Weston Master meter. However the exposure was actually determined, the foreground was underexposed, the highlights in the clouds were quite dense, and the negative proved difficult to print. 从月相亮的比例和方向大概算得出太阳在哪里,初中知识就够了......无论是rapidly fading还是after sunset,亚当斯都在胡说吧......
【在 S*M 的大作中提到】 : well, I know nothing about astrology : I am just saying it was not middle of the day, middle of the night, or : sunrise
y*n
21 楼
有了liveview,对焦曝光都可以很精准
【在 p**p 的大作中提到】 : 月亮基本不用测光吧,满月f11,半缺f8,新月f5.6
S*M
22 楼
I dont see what the problem is, can you elaborate?
the Weston foreground
【在 n******e 的大作中提到】 : : 这是wiki上说的: : The photograph's fame was probably enhanced by Adams's description in his : later books of how it was made: the light on the crosses in the foreground : was rapidly fading, and he could not find his exposure meter; however, he : remembered the luminance of the Moon, and used it to calculate the proper : exposure. Adams's earlier account was less dramatic, stating simply that the : photograph was made after sunset, with exposure determined using his Weston : Master meter. However the exposure was actually determined, the foreground : was underexposed, the highlights in the clouds were quite dense, and the
R*a
23 楼
看一下月亮的形状,想想一下太阳的位置,这个不需要天文学知识
【在 S*M 的大作中提到】 : I dont see what the problem is, can you elaborate? : : the : Weston : foreground
【在 S*M 的大作中提到】 : haven't we agreed that it's the combination of sunset and darkroom trick?( : plus possibly red filter)
n*e
29 楼
I agree it's possibly darkroom trick + red filter, but not sunset
【在 S*M 的大作中提到】 : haven't we agreed that it's the combination of sunset and darkroom trick?( : plus possibly red filter)
S*M
30 楼
That's the part I dont get I thought moon phase is related to the day in the lunar cycle, has nothing to do with time of day
【在 R***a 的大作中提到】 : No, 从月亮高度和月相来看,这是mid-afternoon, 离sunset还远
R*a
31 楼
你需要补的不是天文学,而是幼儿园的光学了...
【在 S*M 的大作中提到】 : That's the part I dont get : I thought moon phase is related to the day in the lunar cycle, has nothing : to do with time of day
n*e
32 楼
I see your confusion the day in the lunar cycle determings the moon phase, which is related to the angular separation of moon and sun so with the position of moon and the moon phase one can estimate the position of the sun that's what we are talking now
【在 S*M 的大作中提到】 : That's the part I dont get : I thought moon phase is related to the day in the lunar cycle, has nothing : to do with time of day
B*s
33 楼
October 31, 1941 4:05 PM (local time) "At the suggestion of Beaumont Newhall , Dr. David Elmore of the High Altitude Observatory at Boulder, Colorado, put a computer to work on the problem [of dating "Moonrise"]. Using data from a visit to the site, analysis of the moon's position in the photograph, and lunar azimuth tables, he determined that the exposure was made at approximately 4:05 P.M. on October 31, 1941."[1] November 1, 1941 4:49 PM "This date [October 31, 1941] was disputed by another scientist, the astronomer Dennis di Cicco, who also attempted dating the photograph based on celestial coordinates; di Cicco was ultimately more accurate with his November 1, 1941, 4:49 P.M. attribution, because he correctly determined Adams' tripod placement on the old road (rather than the newer highway) that runs from the Chama River Valley to Santa Fe."[2]
【在 R***a 的大作中提到】 : No, 从月亮高度和月相来看,这是mid-afternoon, 离sunset还远
n*e
34 楼
by the way, wiki "Ansel Adams"'s references says: ^ David Elmore of the High Altitude Observatory in Boulder, Colorado, determined that Moonrise was taken on October 31, 1941, at 4:03 P.M. ( Callahan 1981, pp. 30–31). Dennis di Cicco of Sky & Telescope magazine noticed that the Moon's position at the time Elmore had determined did not match the Moon's position in the image, and after an independent analysis, determined the time to be 4:49:20 P.M. on November 1, 1941. He reviewed his results with Elmore, who agreed with di Cicco's conclusions (di Cicco 1991, pp. 529–33). either October 31, 4:03 P.M or November 1, 4:49 P.M, it's at least one hour before sunset in New Mexico......
S*M
35 楼
so it was an hour before sunset the "rapid changing light" could be because the foreground was behind hills
his , hour
【在 n******e 的大作中提到】 : by the way, wiki "Ansel Adams"'s references says: : ^ David Elmore of the High Altitude Observatory in Boulder, Colorado, : determined that Moonrise was taken on October 31, 1941, at 4:03 P.M. ( : Callahan 1981, pp. 30–31). Dennis di Cicco of Sky & Telescope magazine : noticed that the Moon's position at the time Elmore had determined did not : match the Moon's position in the image, and after an independent analysis, : determined the time to be 4:49:20 P.M. on November 1, 1941. He reviewed his : results with Elmore, who agreed with di Cicco's conclusions (di Cicco 1991, : pp. 529–33). : either October 31, 4:03 P.M or November 1, 4:49 P.M, it's at least one hour
x*k
36 楼
月亮每天升起的时间不一样,根据月相和高度很容易推算出那是一天当中哪一个时刻, 剩下的不用我多说了吧
【在 S*M 的大作中提到】 : That's the part I dont get : I thought moon phase is related to the day in the lunar cycle, has nothing : to do with time of day