n******e
发帖数: 623 | |
R***a
发帖数: 41892 | 2 方向对吧
这样照片很多。
AA的那张half doom也是这个方向。
并且这张照片每年同样时候都有人去同一个地点想去重复拍的。
要是月亮方向不对，早就被指出来了
【在 n******e 的大作中提到】
: 就算是用GND镜或者后期冲印压暗了月亮，月亮上弦的方向也不对啊？
: http://www.hcc.commnet.edu/artmuseum/anseladams/details/moonrise.html
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n******e
发帖数: 623 | 3 你的月亮快接近满月了，天都这么亮，亚当斯的缺得更多太阳也就更高，那亚当斯是大
白天照的？
【在 R***a 的大作中提到】
: 方向对吧
: 这样照片很多。
: AA的那张half doom也是这个方向。
: 并且这张照片每年同样时候都有人去同一个地点想去重复拍的。
: 要是月亮方向不对，早就被指出来了
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R***a
发帖数: 41892 | 4 为什么不能是白天照的？
【在 n******e 的大作中提到】
: 你的月亮快接近满月了，天都这么亮，亚当斯的缺得更多太阳也就更高，那亚当斯是大
: 白天照的？
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R***a
发帖数: 41892 | 5 注意half dome那张山峰上的光比，显然是白天照得。
这张天空比新墨西哥那张还暗。
天空可以用红滤镜压，反正是黑白照
【在 R***a 的大作中提到】
: 为什么不能是白天照的？
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n******e
发帖数: 623 | 6 那要多少档的GND才把天压得那么黑啊...
【在 R***a 的大作中提到】
: 为什么不能是白天照的？
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y*********e
发帖数: 7269 | 7 是黑白摄影中红色滤镜效果
不是GND
【在 n******e 的大作中提到】
: 那要多少档的GND才把天压得那么黑啊...
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S*M
发帖数: 10832 | 8 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
【在 n******e 的大作中提到】
: 你的月亮快接近满月了，天都这么亮，亚当斯的缺得更多太阳也就更高，那亚当斯是大
: 白天照的？
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R***a
发帖数: 41892 | 9 那张照片不可能是after sunset，月相不对
【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
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n******e
发帖数: 623 | 10 half dome看起来还正常点，新墨西哥那张上半部天空都全黑了，如果白天照的压暗成
那样，可是月亮又那么亮又不对了
亚当斯当时好像没用红滤镜吧，倒是后来解释了一段前景变暗没法测光，于是用著名的
分区暴光法对着月亮测光......
【在 R***a 的大作中提到】
: 注意half dome那张山峰上的光比，显然是白天照得。
: 这张天空比新墨西哥那张还暗。
: 天空可以用红滤镜压，反正是黑白照
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S*M
发帖数: 10832 | 11 well, I know nothing about astrology
I am just saying it was not middle of the day, middle of the night, or
sunrise
【在 R***a 的大作中提到】
: 那张照片不可能是after sunset，月相不对
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p**p
发帖数: 3386 | 12 月亮正确曝光的时候，天空的确会很暗
因为满月的亮度还是很惊人的，不是有月亮11法则么
【在 n******e 的大作中提到】
: 那要多少档的GND才把天压得那么黑啊...
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p**p
发帖数: 3386 | 13 月亮基本不用测光吧，满月f11，半缺f8，新月f5.6
【在 n******e 的大作中提到】
: half dome看起来还正常点，新墨西哥那张上半部天空都全黑了，如果白天照的压暗成
: 那样，可是月亮又那么亮又不对了
: 亚当斯当时好像没用红滤镜吧，倒是后来解释了一段前景变暗没法测光，于是用著名的
: 分区暴光法对着月亮测光......
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n******e
发帖数: 623 | 14
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
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y****n
发帖数: 878 | 15 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
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S*M
发帖数: 10832 | 16 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
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R***a
发帖数: 41892 | 17 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
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p**p
发帖数: 3386 | 18 这用liveview有点overkill，直接把对焦环转到infinity，然后暗月亮11法则曝光就好了
【在 y****n 的大作中提到】
: 有了liveview，对焦曝光都可以很精准
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S*M
发帖数: 10832 | 19 still dont see what the problem is
【在 R***a 的大作中提到】
: 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
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R***a
发帖数: 41892 | 20 他的问题是为啥白天天这么黑。
或者大白天的哪儿来的quick fading light (quote AA)
【在 S*M 的大作中提到】
: still dont see what the problem is
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S*M
发帖数: 10832 | 21 haven't we agreed that it's the combination of sunset and darkroom trick?(
plus possibly red filter)
【在 R***a 的大作中提到】
: 他的问题是为啥白天天这么黑。
: 或者大白天的哪儿来的quick fading light (quote AA)
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R***a
发帖数: 41892 | 22 No, 从月亮高度和月相来看，这是mid-afternoon, 离sunset还远
【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)
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n******e
发帖数: 623 | 23 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)
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S*M
发帖数: 10832 | 24 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
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R***a
发帖数: 41892 | 25 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
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n******e
发帖数: 623 | 26 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
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B****s
发帖数: 796 | 27 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
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n******e
发帖数: 623 | 28 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
发帖数: 10832 | 29 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
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x***k
发帖数: 20754 | 30 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
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n******e
发帖数: 623 | 31 found some other prints of the photo
http://notesonphotographs.eastmanhouse.org/index.php?title=Adams,_Ansel_/_Moonrise,_Hernandez,_New_Mexico
the contact print looks more close to full moon, which may give the right
time-estimation.
Wratten No. 15 (G) filter...that's deep yellow
the print I refered at first has too much contrast enhancement, which makes
the moon phase change... |
