LensTip.com

Lens review

Irix 150 mm f/2.8 MACRO 1:1 Dragonfly

26 February 2019
Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

Three ED elements perform as they should because the tested lens doesn't have practically any problems with longitudinal chromatic aberration. Even at the maximum relative aperture areas positioned further in out-of- focus background don't feature any colouring.

Irix 150 mm f/2.8 MACRO 1:1 Dragonfly - Chromatic and spherical aberration

Now let's check the situation with lateral chromatic aberration – its performance, depending on aperture values and size of detector, is presented below.

Irix 150 mm f/2.8 MACRO 1:1 Dragonfly - Chromatic and spherical aberration


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The results are quite sensational. In the majority of cases you get values below 0.02% and they mean the aberration is imperceptible even if you look at 1:1 photos. A round of applause!

Canon 5D III, RAW, f/2.8 Canon 5D III, RAW, f/16.0
Irix 150 mm f/2.8 MACRO 1:1 Dragonfly - Chromatic and spherical aberration Irix 150 mm f/2.8 MACRO 1:1 Dragonfly - Chromatic and spherical aberration


Spherical aberration

First photos of this chapter don't show any 'focus shift' effect so the level of spherical aberration can't be especially high; still defocused circles of light show that its correction might be far from perfect. The circle behind the focal point features disticnt, lighter rim and the one after the focus is almost devoid of it. It is a classic symptom of spherical aberration and it means the optics of the lens doesn't correct it completely. It's hard to say whether it was a deliberate move in order to ensure nicer bokeh, or it is a price you have to pay for a better correction of other optical aberration.

Canon 5D III, f/2.8, in front of Canon 5D III, f/2.8, behind
Irix 150 mm f/2.8 MACRO 1:1 Dragonfly - Chromatic and spherical aberration Irix 150 mm f/2.8 MACRO 1:1 Dragonfly - Chromatic and spherical aberration