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Tamron's "world’s smallest & lightest 70-300mm" for Sony mirrorless cameras

Tamron 70-300mm f/4.5-6.3 Di III RXD
(Image credit: Tamron)

Tamron has announced the full details and pricing for its new 70-300mm f/4.5-6.3 Di III RXD lens for Sony E-mount cameras – which it claims is "the world’s smallest and lightest telephoto zoom lens".

Far from a simply conversion of one of its existing DSLR lenses, the new Tamron 70-300mm f/4.5-6.3 Di III RXD has been engineered from the ground up for mirrorless systems – specifically the E-mount ecosystem, where Tamron hopes it will sit proudly next to the best Sony lenses (opens in new tab)

Tamron says that the lens was "developed with the concept of bringing the joy of easy telephoto shooting to photographers everywhere." Certainly, its compact and lightweight form factor is the smallest among full-frame 70-300mm lenses for mirrorless cameras, at just 148 x 77mm and 545g (19.2 ounces). 

Helpfully, it also features the same 67mm filter diameter as the rest of Tamron's family of full-frame mirrorless lenses, so you can easily swap attachments between your optics. There are now eight lenses in the Tamron Di III range for the Sony E-mount mirrorless camera lens mount.

• Read more: Tamron 28-75mm f/2.8 Di III RXD review (opens in new tab)

(Image credit: Tamron)
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Specifications

Model number: A057
Lens mount: Sony FE
Full frame: Yes
Image stabilization: No
Autofocus: Yes
Optical construction: 15 elements in 10 groups
Diaphragm: 7 blades
Filter size: 67mm
Dimensions: 148 x 77mm
Weight: 545g

Built specifically with Sony systems in mind, the lens is fully compatible with Sony's Fast Hybrid AF and highly regarded Eye AF systems, making it adaptable to all shooting subjects and scenarios. And the Tamron's RXD stepping motor drive system ensures quick, quiet, high precision autofocus performance. The Tamron 70-300mm is also weather sealed, with moisture-resistant construction, again enabling you to shoot in all manner of situations.

And of course, Tamron is also promising "superb optical performance with high image quality and aberration correction", as you would expect of the best telephoto lenses (opens in new tab) on the market.

The Tamron 70-300mm f/4.5-6.3 Di III RXD will go on sale from 29 October for an recommended retail price of $549.95 / £649.99.

Image shot with Tamron 70-300mm f/4.5-6.3 Di III RXD by Andre Constantini (Image credit: Tamron)
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Image shot with Tamron 70-300mm f/4.5-6.3 Di III RXD by Yuich Maruya (Image credit: Tamron)
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Image shot with Tamron 70-300mm f/4.5-6.3 Di III RXD by Andre Constantini (Image credit: Tamron)
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Tamron's Di III range

Tamron now has eight lenses in its Di III range for Sony cameras

Tamron now has eight lenses in its Di III range for Sony cameras (Image credit: Tamron)

Read more: 

Best telephoto lens: top zooms for your camera
The best Sony lenses (opens in new tab): top lenses for Sony mirrorless cameras
The best Sony camera (opens in new tab): from full-frame Alphas to compact Cyber-shots

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Chris George has worked on Digital Camera World since its launch in 2017. He has been writing about photography, mobile phones, video making and technology for over 30 years – and has edited numerous magazines including PhotoPlus, N-Photo, Digital Camera, Video Camera, and Professional Photography. 


His first serious camera was the iconic Olympus OM10, with which he won the title of Young Photographer of the Year - long before the advent of autofocus and memory cards. Today he uses a Nikon D800, a Fujifilm X-T1, a Sony A7, and his iPhone 11 Pro.


He has written about technology for countless publications and websites including The Sunday Times Magazine, The Daily Telegraph, Dorling Kindersley, What Cellphone, T3 and Techradar.