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Lens review

Tamron 24 mm f/2.8 Di III OSD M 1:2

30 June 2020
Maciej Lata³³o

4. Image resolution

The resolution test (resolution meaning MTF50 function values) of the Tamron 24 mm f/2.8 Di III OSD M 1:2 was based on RAW files from the Sony A7R II. In the case of that mirrorless camera the decency level we set about 39-41 lpmm and some of the best fixed-focal lenses have been able to exceed 70 lpmm; so far the Samyang AF 85 mm f/1.4 FE (76.5 lpmm) and the Voigtlander Apo-Lanthar 65 mm f/2 Aspherical 1:2 Macro (78.5 lpmm) have fared the best.

Let's check how the tested Tamron 24 mm f/2.8 Di III OSD M 1:2 compares – its results in the frame centre and on edges of APS-C and full frame sensors are presented below.

Tamron 24 mm f/2.8 Di III OSD M 1:2 - Image resolution


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Instead of a lengthy discussion let's consult another graph. It presents the tested Tamron's resolution results in the frame centre compared to performances of two other models with similar parameters that we've already tested on the same camera body – namely the Zeiss Batis 2/25 and the Samyang AF 24 mm f/2.8 FE.

Tamron 24 mm f/2.8 Di III OSD M 1:2 - Image resolution


As you can see, the Tamron beats hands down both its opponents, the noticeably more expensive and faster Batis and also the cheap Samyang. While the Samyang can be defended by its dimensions and price, in the case of the Batis there are no excuses. This lens is lucky because I tested it at the very beginning ofour Sony A7R II-based tests and, at that time, I didn't have a lot of material to compare. Now my opinion about it would be far more critical.

Returning to the Tamron – it's clear that its significant physical dimensions are used to its advantage. If a lens with parameters of a pancake is physically much bigger you should expect something extra. Here you get two extra things: very good resolution and a substitute of a macro mode. It should also be mentioned that the tested lens fares in this category better than its 2.8/20 brother.

Additionally, you should praise a good performance on the edge of the APS-C sensor and a quite sensible perfomance on the edge of full frame. Even at the maximum relative aperture the lens is able to exceed 40 lpmm so reaches the decency level. Using the Tamron you can enjoy images of good quality practically across the frame no matter what aperture you employ (of course apart from f/22 where resolution is already damped down by diffraction).

At the end of this chapter, traditionally, we present crops taken from photos of our resolution testing chart which were saved as JPEG files along with RAW files we used for the analysis above.

A7R II, JPEG, 24 mm, f/2.8
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Image resolution
A7R II, JPEG, 24 mm, f/4.0
Tamron 24 mm f/2.8 Di III OSD M 1:2 - Image resolution