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Tamron 24mm f/2.8 Di III OSD M1:2 Review - Performance

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Tamron 24mm f/2.8 Di III OSD M1:2 Performance

Centrally, sharpness is excellent from f/2.8 all the way through to f/16. It is still very good even at f/22, where diffraction just starts to take effect. The edges are excellent at f/2.8 and f/4, very good from f/5.6 to f/16, only softening due to diffraction at f/22.


Tamron 24mm f/2.8 Di III OSD M1:2 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 Sony Alpha A7R III using Imatest. Want to know more about how we review lenses?

CA (Chromatic Aberration) is measured with in-camera corrections switched off and is outstanding at the centre. There is some colour fringing at the edges, but software solutions can take care of it, and in any event, it will not be a problem with most subject matter.


Tamron 24mm f/2.8 Di III OSD M1:2 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 A7R III using Imatest.


As with the 20mm, the designers have opted to accept barrel distortion, in this case, -6.13%, and use the in-camera corrections to enhance the lens performance and reduce this to a very reasonable -0.81%. Of course, this means that in the future anyone buying this lens second hand would need to be aware that corrections to distortion were needed either in-camera or in some other software. But for where we are right now, the in-camera option totally nails it.

Bokeh is not the forte of ultra-wide lenses, which are often used at small apertures to take advantage of the maximum depth of field possible. The smoothness of the out of focus areas is very acceptable, but unsurprisingly not in the same league as the best short telephoto lenses.

As with the 20mm, flare resistance is superb. Even including low sun in the edge of a shot the worst that can be seen is a pleasant star of light rays, with very little effect at all on contrast.

Vignetting can often be much worse with compact lenses, but here we have relatively modest corner darkening.

Aperture Vignetting
f/2.8 -1.8 stops
f/4 -1.4
f/5.6 -1.2
f/8 -1
f/11 -0.9
f/16 -0.9
f/22 -0.9

In summary, another excellent performance.


Tamron 24mm f/2.8 Di III OSD M1:2 Sample Photos


Tamron 24mm f/2.8 Di III OSD M1:2 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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Thanks for this early review. It is good and the verdict is unsurprising. I've compared your MTF chart for this lens with that of the Tamron 17-28/2.8 at 24mm and just like the performance of the 20mm lens, this prime lens performance shows a marked improvement over the zoom. Of course this should be expected. Like the 20mm lens I'm tempted to add this to my collection (more choice, more quality and less weight) but my business case is not entirely sound! Anyhow, kudos to Tamron for giving us more options and less cash in our wallets.

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