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Tamron 70-300mm f/4.5-6.3 Di III RXD (A047) Review - Performance

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Tamron 70-300mm f/4.5-6.3 Di III RXD Performance

Looking first at sharpness, at 70mm the centre is excellent from f/4.5 through to f/16 and remains very good at f/22. The edges are fair from f/4.5 to f/8, very good at f/11 and f/16 and good at f/22.


At 100mm the centre is very good at f/4.5, excellent from f/5.6 to f/11 and very good at f/16 and f/22. The edges are again fair from f/4.5 to f/8, very good at f/11 and f/16 and good at f/22.

At 200mm the centre is excellent from f/5.6 to f/16, very good at f/22 and fair at f/29. The edges are fair at f/5.6, very good at f/8, excellent at f/11, very good at f/16, good at f/22 and fair at f/29.

At 300mm, the centre is very good at f/6.3, excellent at f/8 and f/11, very good at f/16 and f/22 and fair at f/32. The edges are fair at f/6.3 and f/8, very good at f/11 and f/16, good at f/22 and fair at f/32.

 

Tamron 70-300mm f/4.5-6.3 Di III RXD 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 all camera corrections switched off, as far as it is under our control. Centrally CA is almost totally controlled and will not be a problem. The edges do stray somewhat, colour fringing becoming more apparent as we zoom towards 300mm. Certainly, colour fringing will be seen in images of branches against a bright sky and similarly challenging situations. Corrections can always be applied with either in-camera of other software.

 

Tamron 70-300mm f/4.5-6.3 Di III RXD 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.

 

Distortion is also measured with camera corrections switched off. It's pincushion all the way, starting off with almost perfect geometry at 70mm and peaking around 200mm. The figures for pincushion distortion are +0.07% at 70mm, +2.44% at 100mm, +3.25% at 200mm and +2.88% at 300mm. This is definitely noticeable, but corrections can be applied in software.

Bokeh is a description of the gradation and smoothness of the out of focus areas in an image. An obvious example is where we want a beautifully defocused background to a portrait. In this case at wider apertures the effects are indeed very effective. At smaller apertures very fine detail can become a little “busy”, depending on distance and subject matter.

Flare control is extremely impressive and it is difficult to induce any, something which has been typical of Tamron lenses. If we really put our minds to it creating some subdued artefacts can be done, but contrast still holds well and the lens defies most attempts to cause flare.

Vignetting is well controlled throughout the range and the results are:

Aperture 70mm 100mm 200mm 300mm
f/4.5 -2.1 stops -1.6    
f/5.6 -1.5 -1.4 -1.9 -1.5 (f/6.3)
f/8 -1 -1.2 -1.1 -1.2
f/11 -0.7 -1.1 -0.5 -0.6
f/16 -0.6 -1 -0.4 -0.4
f/22 -0.6 -1 -0.4 -0.4
f/29-f/32     -0.4 (f/29) -0.4 (f/32)


Tamron 70-300mm f/4.5-6.3 Di III RXD Sample Photos

 

Tamron 70-300mm f/4.5-6.3 Di III RXD 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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Comments


cacatua 17
18 Nov 2020 11:11AM
Does this fit a Canon DLSR ?
18 Nov 2020 11:41AM
No, this is designed for Sony mirrorless cameras.

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