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.
thank
想問清楚, 光圈越大,image circle越大,還是光圈越小,image circle越大???
另外,在大過f/22/f16的光圈時,會不會好以135鏡會有洐射,而影響最後成像。
老超, 可能我看錯。
Schneider 和Rodenstock 都有為CALUMET Caltar 出鏡,請問CALUMET Caltar 的鏡是不是等同原廠,或者好以sinar,linhof等要求高過原廠。
對Super Symmar HM , ED/APO class tele lenses的分別有興趣,遲些再talk.