Zeiss Loxia 25mm f/2.4 Distagon T* Review - Performance

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Zeiss Loxia 25mm f/2.4 Distagon T* Performance

Central sharpness starts off as excellent at f/2.4 and remains in the excellent category all the way through to f/16. It is still very good at f/22, so basically any aperture can be used with total confidence. It will only alter the depth of field. Edge sharpness is very good at f/2.4, and from f/4 through to f/16 is excellent throughout, in fact being within a whisker of returning the same resolution figures as the centre. There is a drop at the edge at f/22, hardly surprising for any lens, but even here it is still good.

Zeiss Loxia 25mm f/2.4 MTF Charts

How to read our MTF charts

The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges.

The scale on the left side is an indication of actual image resolution as LW/PH and is described in detail above. The taller the column, the better the lens performance.

For this review, the lens was tested on a Sony Alpha A7 using Imatest.


CA (Chromatic Aberration) is keenly controlled and all but banished at the centre of the frame. The edges show very slight amounts of CA but here too the figures are held at very low amounts. Even the most demanding situations do not reveal any really obvious fringing. Further correction would be possible in software but for most purposes would hardly be necessary.

Zeiss Loxia 25mm f/2.4 Chromatic Aberration Charts

How to read our CA charts

Chromatic aberration (CA) is the lens' inability to focus on the sensor or film all colours of visible light at the same point. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. It can be cured in software.

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more.

For this review, the lens was tested on a Sony Alpha A7 using Imatest.

 

Distortion is -0.94% barrel, which is excellent for a 25mm lens. Obviously straight lines near the edge of the frame may show very slight bending, and correction in software could be made if needed.

Flare is well controlled by the T* coating and general design of the lens and even when the sun, admittedly low weak winter sun during this review, was in frame there were no signs of artefacts.

Bokeh, the quality of the out of focus areas, reveals much of the “character” of a lens, something sometimes referred to as its “look”. Indeed, some lenses of the past have built reputations based on these imprecise descriptions, long before the word bokeh started to be used. However, lenses are creative tools and regardless of the technical figures they deliver some do have a special quality that goes beyond this. This new lens displays easy, relaxed and smooth bokeh that gives a really pleasant look to out of focus backgrounds and to combine this smoothness with the high resolution mentioned is a laudable achievement by Zeiss.


Zeiss Loxia 25mm f/2.4 Sample Photos

 

Zeiss Loxia 25mm f/2.4 Aperture range


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Comments


14 Feb 2018 1:10PM
It doesn't matter how excellent a lens is, if it doesn't fit my Pentax K-1, it is useless. Tongue

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