雖然中大幅人數在老餅家不算很多,但有不少精通中大幅之士。
希望可以集中討論,幫助中大幅新丁! (當然包括我) 謝謝!
F22思迷?
有名中大幅風景相,大部份都是用F22光圈或者更細光圈F64。除了景深因素外,每支鏡最高效率是F22光圈? 另外連每支鏡的IMAGE CIRCLE都是以F22來算,是不是F22能給到最大IMAGE CIRCLE,而F5.6給不到? 那F5.6光圈除了方便對焦外,實用價值在那裹??
老超是不是有支Caltar 210MM F5.6鏡?
版主: kiev, mickey_mouse
cco 寫:F22思迷?
有名中大幅風景相,大部份都是用F22光圈或者更細光圈F64。除了景深因素外,每支鏡最高效率是F22光圈? 另外連每支鏡的IMAGE CIRCLE都是以F22來算,是不是F22能給到最大IMAGE CIRCLE,而F5.6給不到? 那F5.6光圈除了方便對焦外,實用價值在那裹??
NetNetBoy 寫:mmm...![]()
可否解釋下...
image circle? 影像圈? 是景深引起的圈圈?
NetNetBoy 寫:Schneider is calculated at F/22, but Rodenstock using F/16?
是設計時用F/22 和 F/16 為標準?
NetNetBoy 寫:the larger the aperture, the more spherical distortion there?
大光圈 有更多 鏡光變型問題?
Cloudy 寫:cco 寫:F22思迷?
有名中大幅風景相,大部份都是用F22光圈或者更細光圈F64。除了景深因素外,每支鏡最高效率是F22光圈? 另外連每支鏡的IMAGE CIRCLE都是以F22來算,是不是F22能給到最大IMAGE CIRCLE,而F5.6給不到? 那F5.6光圈除了方便對焦外,實用價值在那裹??
>>> 每支鏡最高效率是F22光圈?
Almost!
>>> 另外連每支鏡的IMAGE CIRCLE都是以F22來算,是不是F22能給到最大IMAGE CIRCLE,而F5.6給不到?
F22以後既光圈既image circle, 會再大D, 但分別不大!
F5.6既image circle細D! (但都可用黎影相!)
>>> 那F5.6光圈除了方便對焦外,實用價值在那裹??
影大光圈, 淺景深既相! (e.g. Portrait, Fashion)
香港至NET超人 寫:I don't have any Caltar. Mine are Schneider, Rodenstock and Fujinon.
Why use F22? It is because my lens are small in aperture and they are not very good performance in wide open. But in fact, some of my lens already perform better in f/16 or f/11 when compare to F/22.
The image circle of Schneider is calculated at F/22, but Rodenstock using F/16. The larger the aperture, the larger the image circle. But, the larger the aperture, the more spherical distortion there, which means that even you can record on film, it is a blur image only.
Believe it or not, Super Symmar HM already owning nearly 90% top performance at there aperture wide openned.
This is also true to most ED/APO class tele lenses.
Cloudy 寫:NetNetBoy 寫:mmm...![]()
可否解釋下...
image circle? 影像圈? 是景深引起的圈圈?
It has many different name, e.g. coverage, covering power, circle of acceptance
of definition ... (just recall from my memory, maybe a bit different)
>>> 是景深引起的圈圈?
No, I think you mixed up with the term "circle of confusion".NetNetBoy 寫:Schneider is calculated at F/22, but Rodenstock using F/16?
是設計時用F/22 和 F/16 為標準?
Different lenses have its different standards.NetNetBoy 寫:the larger the aperture, the more spherical distortion there?
大光圈 有更多 鏡光變型問題?
Shortly, larger aperture, smaller covering power.
cco 寫:如果不同光圈有不同的IMAGE CIRCLE,我想知道不同光圈的IMAGE CIRCLE,可不可以計算出來。(因為不同的IMAGE CIRCLE會影響到鏡的TILT,
RISE, SHIFT等.)
cco 寫:題外話,為何鏡廠只多數只LISTF22/F16光圈的IMAGE CIRCLE,而不會全部LIST出來?
cco 寫:大幅 image circle ,視角xx度,景深的關係有小小混亂, 可不可以講楚小小.
謝謝
cco 寫:另外,知不知深圳附近有比較多攝影書(講45)賣,深圳書城? 想找些鬼佬攝影書的中文版.
kiev 寫:cco 寫:另外,知不知深圳附近有比較多攝影書(講45)賣,深圳書城? 想找些鬼佬攝影書的中文版.
書城有一兩個專櫃,樂凱(賣器材那間)亦有!柯凸果本大畫幅攝影,廣州果間"黑白"專門店亦有。
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