LensTip.com

Lens review

Carl Zeiss Touit 32 mm f/1.8

29 September 2013
Arkadiusz Olech

7. Coma, astigmatism and bokeh

We remember perfectly well that the Zeiss 1.8/32 had serious problems with reaching a decent image quality on the edge of the frame near the maximum relative aperture. One glance at the crops below and you are sure that the coma is responsible to a great extent because its level is very high at the maximum relative aperture. Even on stopping down to f/2.5 that off-axis aberration is still keenly felt – it’s obvious the Zeiss doesn’t manage it well.

Carl Zeiss Touit 32 mm f/1.8 - Coma, astigmatism and bokeh


The astigmatism for a change is corrected very well. The average difference between horizontal and vertical MTF50 function values amounted to just 3%.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

The circles created by defocused light points look very nice as well - apart from the aforementioned lighter edges we don’t have any reservations. The light spread is even, there is no onion rings structure or any significant local extremes visible – as a result the blur, provided by the tested lens should be pleasant to the eye.

Carl Zeiss Touit 32 mm f/1.8 - Coma, astigmatism and bokeh


A noticeable change of the shape of the circles in the frame corners is another matter but it is a result of vignetting which is going to be described properly in the next chapter.