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超焦距離公式的推導沒有問題。
不過
麻煩請先證明超焦距離這和空間壓縮感成正比的。 |
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回復一下主題吧!不然可能論不下去了.
1dsII,my fantasy, I want you, I need you, I want you to improve your focus, I need you to drop your price, then you will be mine.
這樣會不會轉的很硬?
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cccc~~~
要比唱情歌咩??
哼哼....
這是我對1dsII的愛。(大家兔吧~~~~~)
起音1*2*3*4
******
讓我站在世界的屋脊高歌，
唱著永恆的愛戀。
我的愛因你的愛而飽滿，親愛的，
每天，將會有一朵花兒，爬上你的雙唇前來尋我，歡天喜地的。
我的醜人兒，我愛你，我愛你金黃的腰。
我的美人兒，我愛你，我愛你嘴上的笑。
那是月之線條，蘋果之小徑，
我將吞下你每一股氣息，每一聲嗚咽。
你的血在我的血中，在這午夜星光燦爛與藍的河床，倚夢而憩，
一如熟睡的琥珀，化作了這片歇息。
這無止境單純的愛戀。
-----
喵的，這是人家寫給美眉的情書也搬上檯面了~_~
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哇!一地死兔(都嘔死的). |
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啊
真是啊達了, minipai兄說的是對的,
小弟的想法是在主體等同放大率下才成立,
這應該也是hytong 兄想說的, 用不同焦距拍出一樣大的花朵
背後的背景會不一樣寬, 倒是景深和透視感應是沒關的了.
多謝指正.....
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hytong,
【視角一樣，拍出來的空間感一樣】 is based on
【透視感, perspective, is determined by camera-to-subject distance only】
給Kevin6506 和surge0301
不用逃避話題。這個議題我敢用1DS mark II 賭我是對的 |
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just realize image enlargement ratio is different between different formats with same picture angle |
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how does image enlargement ratio effect perspective??
You said perspective, is determined by camera-to-subject distance only |
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the source of confusion is trying to keep the same absolute subject size vs. producing the same subject size through enlargement after image capture |
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If it"s true, then F stop will effect perspective either.
I don"t think any one would agree. |
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are we trying to compare 空間壓縮感 of different format using different focal length but same picture angle or something else? |
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I am tallking about same picture angle will take same 空間壓縮感 whatever by any format.
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It"s based on "perspective, is determined by camera-to-subject distance only"
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picture angle effect the camera-to-subject distance.
when you want a same size of subject in the photo.
A more tele lens need a less distance.
How does enlargement ratio effect?? |
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in order to keep a constant picture angle on different format (constant mount-to-film/sensor distance), we need lens of different focal length.
this is producing the same subject size through enlargement after image capture:
e.g. at the same focusing distance, a 10mm lens on 20D will give the same picture as a 16mm lens on a EOS1, their only difference is physical size. The 20D image is 22.5X15mm and the EOS1 image is 36X24mm
Now print both image to 4R, the 20D image will require a enlargement of 6.4X while the EOS1 will require a enlargement of 4X
Enlargement ratio has an effect on apparent DOF thus it is an important factor in photography.
this is producing the same absolute subject size through changing camera-to-subject distance:
e.g. in order to achieve the same subject size at image capture time, you need a shorter shooting distance when using a 10mm lens on 20D then a 16mm lens on a EOS1, their difference is background coverage. |
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shoting distance only effect the size of subject.
the coverage of background only can changed by picture angel.
Show me a different background coverage shooted by 10mm lens on 20D and a 16mm lens on a EOS1 if you can.
If background caverage could be changed by shooting distance, people don"t need to buy wide lens. The only thing they need to do is walk backward.
Since the subjects is in same size, and the background coverage is the same either, the 空間壓縮感is the same. |
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以10D配 10mm 鏡頭和 1Ds配16mm鏡頭,
站在同一地點, 根據透視投影及相似形原理,
兩張影像上景物的實體成像大小不同, 但是
所有景物彼此間的相對大小比例 在兩張影像上是相同的,
(亦即, 若物體A與B在第一組中的成像大小比例是1:3,
則在第二組的成像大小仍然是1:3)
小弟個人認為這就是所謂的透視感或空間感相同,
不知各位大大有沒有不同的看法?
(當然景深是不一樣的) |
