我的ZE85在使用大光圈(1.4或2.0)拍摄比较近的物体时(3米以内)，如果在相机的合焦提示显示合焦的时候按下快门，焦平面会有比较明显的前移。看了一些国外的镜头评测网站，似乎这是一个85mm Planar用在自动相机上的一个必然现象。

请问一下用过ZE85、ZF85的网友，用没有发现类似的问题？

我的相机是50D，刚去佳能做过检测，机器本身应该不跑焦。
换了ef-s对焦屏似乎也不是很好用，可能是我眼神不济……不知上裂像或是全微棱会不会改善。
LV奇准无比，但用起来太麻烦。

手动头都是这样，不要看合焦提示，提示好多不准，还是直接看取景器，清楚就按快门。另外没必要换裂像屏，原厂的可能好些，但也不一定准。

从某种角度讲应该是的，不然佳能也不会推出什么高精屏。换句话说，如果不是蔡司，而是其他手动头或者说佳能自己的红圈头当手动头操作，应该也会有类似的事情发生

我理解蔡司的意思为：不是蔡司镜头问题，都是造相机的错！

好贴帮翻译：
Fast lenses of this optical design (without floating elements) shift the focus due to spherical aberration when the f-stop is changed. This phenomenon is especially visible on closer object distances and cannot be influenced. The AF system of most camera models does not respect those characteristics of a lens. The focus is measured and confirmed by the focus indicator as if the lens has been stopped down to f/5.6.
采用这种设计(planar)的（没有浮动镜组）大光圈镜头，在使用不同的f值时，球面相差也不同，导致焦点变化。这种现象在物距很近时特别明显，而且不受其他因素影响。大多数相机的自动对焦系统没有考虑到大光圈镜头的这种特性。光圈收至f/5.6或更小时，焦点指示器才能测量和确认焦点位置。
While using the lens wide open, the correct focus lies usually a little bit in front of the point that has been expected. Beside this, the focus confirmation function of any AF-camera is a relative improper tool for accurate focusing of an f/1.4 lens on closer distances. Also, a standard focusing screen and viewfinder of an SLR camera shows the limitations of accurate manual focusing with an 85mm lens at f/1.4. For instance, it is not possible in practical use to focus more accurately than about +/- 2 cm at an object distance of 1m without additional magnification systems. For accurate focusing at full aperture or stopped down a little bit, we strongly recommend:
当光圈全开时，实际焦点通常比希望的位置靠前一点。除了这些，所有自动对焦相机的焦点确认的精度不能应付光圈f/1.4、近距物体这种情况。同样的，使用单反相机的标配对焦屏和取景器进行手动对焦，精度也有限，不足以应付这种情况。实际拍摄中，不使用放大附件时，拍摄1m处的物体，对焦要达到正负2cm的精度，基本上是不可能的。为了保证光圈全开或收一点时的对焦精度，我们强烈推荐你：
-use a tripod if possible
-use zoom-in function in live-view mode while the lens has been stopped down to the designated f-stop.
-focus bracketing exposures (with small steps of rotating the focusing ring)
-如果可能的话使用三脚架。
-当使用特定的镜头光圈值时，在实时取景拍摄时，使用放大功能对焦。
-使用焦点包围拍摄法（在标准焦点时，正反转动对焦环较小的角度，多拍几张）。

转一个菜司对这个问题的解释:
Fast lenses of this optical design (without floating elements) shift the focus due to spherical aberration when the f-stop is changed. This phenomenon is especially visible on closer object distances and cannot be influenced. The AF system of most camera models does not respect those characteristics of a lens. The focus is measured and confirmed by the focus indicator as if the lens has been stopped down to f/5.6.

While using the lens wide open, the correct focus lies usually a little bit in front of the point that has been expected. Beside this, the focus confirmation function of any AF-camera is a relative improper tool for accurate focusing of an f/1.4 lens on closer distances. Also, a standard focusing screen and viewfinder of an SLR camera shows the limitations of accurate manual focusing with an 85mm lens at f/1.4. For instance, it is not possible in practical use to focus more accurately than about +/- 2 cm at an object distance of 1m without additional magnification systems. For accurate focusing at full aperture or stopped down a little bit, we strongly recommend:
-use a tripod if possible
-use zoom-in function in live-view mode while the lens has been stopped down to the designated f-stop.
-focus bracketing exposures (with small steps of rotating the focusing ring)