原帖由 opo25 于 4-12-2007 05:33 PM 发表
2. DX 镜用在底片机上,不需要 x1.5 倍,而是用会原本的焦距,但是有些较焦距会有成像圈。
举例 (其他网站看来的),Tokina 12-24mm 超 ...
哦,可是我看到有些却是从dx x 回过去film cam 的。。。究竟是什么跟什么?
引用以下从 http://www.kenrockwell.com/nikon/dx.htm 抄过来的。这又是什么意思呢?我就是看不明白这个。。。他算得方式好想不一样。。
Because these sensors are 1.5x smaller than film, they show an area equivalent to the area shown by a lens 1.5x as long on 35mm film. A 100mm lens on one of these cameras shows the same area of view that a 150mm lens would show on a 35mm film or full-frame camera. Multiply a lens' focal length by 1.5 to get the focal length of a lens which, when used on a full-frame or 35mm film camera, gives the same angle of view as that lens does on one of these cameras. Examples: This lens on DX | looks like these do on FX or 35mm film | 10.5mm | 16mm | 12mm | 18mm | 13mm | 20mm | 14mm | 21mm | 15mm | 23mm | 17mm | 26mm | 18mm | 27mm | 20mm | 30mm | 24mm | 37mm | 28mm | 43mm | 35mm | 53mm | 50mm | 76mm | 55mm | 84mm | 60mm | 91mm | 70mm | 107mm | 80mm | 122mm | 85mm | 129mm | 100mm | 152mm | 105mm | 160mm | 135mm | 206mm | 180mm | 274mm | 200mm | 305mm | 300mm | 457mm | 400mm | 609mm | 500mm | 762mm | 600mm | 914mm | 800mm | 1,219mm | 1,000mm | 1,523mm | 1,200mm | 1,828mm | 2,000mm | 3,047mm |
(I rounded these to the nearest mm, and I used the more precise factor of 1.523435) [size=+2][size=+3]List of FX Cameras (1.00 Crop) Top All film Nikons since 1959.
[ 本帖最后由 海底人 于 4-12-2007 05:55 PM 编辑 ] |