Irix 45mm f/1.4 Dragonfly Review - Performance

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Irix 45mm f/1.4 Dragonfly Performance

Centrally, sharpness is very good at f/1.4, excellent from f/2 to f/11 with it reaching a peak and being outstanding at f/5.6. It is still very good at f/16 and even at f/22.

The edges are very good at f/1.4 and f/2, excellent from f/2.8 to f/11 and very good at f/16 and f/22.

The sharpness results are highly impressive.


 

Irix 45mm f/1.4 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 and sharpness 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 Canon EOS 5DS R using Imatest. Want to know more about how we review lenses?


CA (Chromatic Aberration) approaches zero at the centre and at the edge is generally well below one half of a pixel. This is excellent and hardly an issue under any normal circumstances. If desired, the CA could be addressed further in software but this is unlikely to be necessary.

 

Irix 45mm f/1.4 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 Canon EOS 5DS R using Imatest.

 

Barrel distortion can be measured at -0.28%, very close to being rectilinear. The lens would be very suitable for architecture, where the straight lines of buildings need to remain so, even at the edge of the frame.

Bokeh is nice. The quality of the out of focus areas is very satisfying.

Flare resistance is also an important quality, and it proves to be well nigh impossible to induce flare in almost any situation, a tribute to Irix's neutrino coatings.

Vignetting is though quite visible, especially at wider apertures. This can be a good thing with some subjects, but if it needs removing then there are options in-camera and in software to address this.

The vignetting results:

Aperture Vignetting
f/1.4 -2.4 stops
f/2 -1.8
f/2.8 -1.6
f/4 -1.4
f/5.6 -1.3
f/8 -1.3
f/11 -1.3
f/16 -1.3
f/22 -1.2


Irix 45mm f/1.4 Sample Photos

 

Irix 45mm f/1.4 Aperture range

You can view additional images in the Equipment Database, where you can add your own review, photos and product ratings.


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