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A little vignetting can often enhance subjects, concentrating our eyes on the centre of the frame.Ĭarl Zeiss Tessar 50mm f/2.I have a Windows 7 operating system and the mouse installed its own drivers in about a minute. Vignetting starts off at -1.4 stops at f/2.8, settling thereafter to about two-thirds of a stop of corner darkening. In the worst case, shooting right into the light with the sun at the frame edge, there is haze and a loss of contrast, but nothing in the way of created artefacts. Coupled with the deeply recessed front element, this protects against flare quite effectively and increases contrast. This lens is a fairly simple construction, with few elements to scatter light. Then highly complex lenses do become a possibility. However, coating the four element optic would reduce the reflection and scatter to around 5% and multi-coating perhaps to more like 1% or less. Even a simple four-element lens if uncoated can reflect around 35% of the light hitting it, causing scatter and loss of contrast. In fact, the bokeh of the lens is quite attractive, especially at f/2.8 and f/4, where the sharpness has not really kicked in.įlare was one of the real difficulties in early complex lenses. We expect some barrel distortion from 50mm lenses of this era, and here that measures at -0.88%, a good result that will likely cause no issues whatsoever.īokeh is not getting any help from just 5 blades in the diaphragm, but the lens aberrations may help to mitigate this.

It can be cured in software.Īpochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more.įor this review, the lens was tested on a Canon EOS 5DS R using Imatest. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. Chromatic aberration (CA) is the lens' inability to focus on the sensor or film all colours of visible light at the same point.

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