|
|
發表於 2015-4-20 16:31:27
|
顯示全部樓層
本帖最後由 vincecharus 於 2015-5-12 18:48 編輯
I would not say anything absolutely. In some circumstances, M8.2 might give better images than A7II.
M8.2 has an APS-H cropped CCD sensor. The IR filter in front of the M8.2 sensor (Kodak KAF-10500 CCD, now discontinued) is only 0.5mm thick. While it is not 100% effective in blocking IR light, sometimes resulting in purple casts in what should be pitch black in an image, it has 2 advantages: (1) it gives wide-angle and superwide-angle lenses better performances, as the main cause of purple edges and decreased image quality towards the edges is due to the IR glass filter in front of the sensor; and (2) more sensitivity in the shadows. When Leica ventured into digital, these were the engineering trade offs for maintaining the performances of Leica wide angles on its first digital camera, M8. If you are interested in IR photos taken with the M8, look at 18x24 c-hing's thread.
Because of the APS-H cropped sensor of the M8.2, an image taken by the camera is equivalent to the central 77% of the area of an image taken by a camera with a FF sensor. If you look at the MTF curves of most lenses, the edges of an image is likely where a lens performs worst. M8.2 automatically cuts out the edges where a lens is unlikely to perform as well as in the center. This is one of the reasons why experienced users of M8 and M8.2 often say they produce even better images than M9.
While Sony A7II is a modern, versatile camera that has superior high ISO performance, its 1mm IR glass filter in front of its FF sensor means most Leica wide angles and superwide angles do not perform optimally on it. Used together with M-mount wide angles or superwide angles, you are likely to find that the image quality deteriorates towards the edges, sometimes very significantly. (Modern lenses such as the new ZM 35/1.4 and Voigtlander 15/4.5 III might be exceptions.)
I would say M8.2 has the following advantages:
- CCD sensor
- 0.5mm IR cut filter in front of the sensor
- optimal performance of most M-mount wide angle and superwide angle lenses
A7II has the following advantages:
- full frame
- latest technology and modern design
- great high ISO performance
- live view
- autofocus
- ability to use any lens, not just M-mount lenses
- repair and maintenance not likely to be an issue
For a practical photographer, A7II would be the choice.
For someone who loves Leica, CCD, and is looking for optimal performance in wide angle or superwide angle M-lenses (and the option to do IR photography) under low ISO, M8 or M8.2 would be the choice.
|
|
樓主
