Design & Build
The Tamron 150-500mm is an enticing lens because of where it slots in with the current Sony E-mount lenses.
There’s Sony’s expensive G-Master 100-400mm, which is excellent, but only hits 400mm. There is Sony’s great 200-600mm at an affordable price point, which gives 600mm in range with extra size and weight. And now, there is this Tamron, giving a good in-between of reach and size.
The lens is 8.3 inches (209.6 millimeters) long and 11.1 inches (283 millimeters) when fully extended. The lens (with tripod collar) weighs 4.1 pounds (1.86 kilograms).
Let’s compare those numbers. Retracted, it’s about the same size as the Sony 100-400mm. But, it weighs about 1 pound more. It is still smaller than the 200-600mm, and about a half pound less.
Now, it is an external zoom lens, but that allowed Tamron to pack 500mm into a small package. This lens is a great size for what it offers, which is 150-500mm range with great image quality.
Build quality is excellent. It feels like a pro grade lens. You can lock zoom at focal lengths (which is really a great feature), lock the external zoom for transport, switch focus range, and choose from 3 Vibration control settings on the lens.
Although it zooms externally, Tamron promises weather sealing and protection from the elements.
Image Quality
Image quality is superb from the Tamron 150-500mm. It is on par with the Sony 200-600mm and just slightly worse than Sony’s G-Master 100-400mm (which is $1,000 more and only offers 400mm).
Although an f/5-6.7 lens, you will need to stop down for maximum sharpness. In general, peak center sharpness is right around f/8 on this lens.
One downside is corner sharpness. The corners definitely don’t resolve well unless stopped down around f/11 – f/13. I find this a minor issue though, as this is primarily a wildlife lens and most subjects will be close to centered in the frame.
Bokeh is actually very good at the wide-open apertures of this lens. But, at those apertures the lens isn’t as sharp as f/8, thus you will have to make a decision on whether or not the additional sharpness is worth it or if shooting wide-open for more light and better bokeh is worth the loss in sharpness.
In my opinion, shooting wide-open and sharpening during post-processing works great. The sharpness wide open isn’t bad by any means, it’s just not the sharpest aperture of the lens, which is normal for most of the Tamron builds we see.