Tamron Launches the Sleek 70-300mm f/4.5-6.3 Di III RXD Lens for Sony

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Tamron is continuing to expand its popular line of compact and lightweight lenses for Sony E shooters with the 70-300mm f/4.5-6.3 Di III RXD. A popular zoom range for DSLRs, this flexible telephoto range is now available for full-frame mirrorless as a sleek one-lens option for distant and portrait-length subjects. Beyond its small profile, the lens is also characterized by a durable design and advanced optics that slot it right in range with Tamron’s other Di III lenses for Sony E.

Tamron’s key goal when bringing this zoom over to full-frame mirrorless was to make it a sleek and lightweight lens; to make it an inviting way for anyone to work with such long focal lengths without worrying about the heft of large lens sizes. Measuring 3 x 5.8", sporting a 67mm front filter size, and weighing just 1.2 lb, this 70-300mm is suitable for leaving on your Sony camera for all-day, walkaround shooting, especially if your shooting trips include landscapes, portraits, wildlife, and sports subjects. Beyond its form factor, this lens is also distinguished by a moisture-resistant build that further reinforces its use outdoors.

Optically, the 70-300mm incorporates specialized elements to suppress a variety of aberrations and distortions throughout the zoom range. An RXD (Rapid eXtra-silent stepping Drive) autofocus motor is employed, too, which delivers quick, quiet, and smooth AF performance that benefits both photo and video needs. This focusing motor also permits full-time manual focus control and is compatible with Sony’s Direct Manual Focus function as well as Fast Hybrid AF and Eye AF functions.

What are your thoughts on Tamron’s latest lens, the 70-300mm f/4.5-6.3 Di III RXD? Do you have any experience with Tamron’s other compact zooms for Sony E? Let us know your thoughts in the Comments, below.

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I recently pre-ordered the Tamron 70-300mm f/4.5-6.3 Di III RXD Lens for Sony as, what I think will be, a wonderful travel lens.  Having also recently pre-ordered the Sony a7c and its kit 28-60 lens, I've made the transition from a dual Sony system (aps-c and full frame) to full frame only (a9, a7rIII, a7c and full-frame lenses).  Here's hoping that Tamron comes through yet again with some excellent optics in a small package.

I wish Tamron would make an e-mount version of the 28-300mm f/3.5-6.3 Di VC PZD Lens for Canon

While not quite the same reach, Tamron did release the 28-200mm f/2.8-5.6 Di III RXD (https://www.bhphotovideo.com/c/product/1568708-REG/tamron_a071_28_200mm_f_2_8_5_6_di_iii.html) a while back that serves a similar purpose but has the mirrorless-specific compact design.

Looks cool!  I'll be interested to see how this performs relative to Sony's APS-C 70-350 — I know I'd like to have a longer telephoto zoom for the A7III without spending too much, but now I have to decide if I want Sony glass in APS-C mode or Tamron and full-frame.

Thinking pretty much the same thing. However, the lack of OSS in a 300mm lens that is comparatively slow at its longest focal length could be concerning for actual usability. Looking forward to the reviews.

Good points, and the reviews will be telling.  Looks like Tamron has a bit more information up at their site now: https://www.tamron-usa.com/product/lenses/a047.html

Also looking forward to getting our hands on one. Regarding IS in the lens, I think Tamron is playing more into designing the lightest and smallest lens possible and relying on you to use a camera with in-body image stabilization. I think if you're using this lens without stabilization at 300mm, then you're right, it'd be quite the challenge.

Like you said, I think the decision between this Tamron and the Sony 70-350mm more falls on the full-frame vs APS-C debate. And if you're using it on an a7 III, then I'd definitely be more inclined to go for the lens that covers the full-frame sensor rather than having a lens that can only cover a portion of the sensor area.

I've been begging the glass gods for sub-1k lenses on full frame E mount for so long it's ridiculous and the fact that this thing is only 550 is a miracle. I am DEFINITELY popping this in my bag as my sports and bird lens, though I'm also happy to be able to shoot 85 again when this lens drops.

Definitely good news, Allison. It looks to be a really great choice for longer-distance subjects while still being lightweight enough for walkaround shooting. Let us know what you think of it!

Tamron and other third party companies are just making my decision to switch to Sony all the more smarter. Unlike Nikon, who keeps everything a secret with their design so third party lens have to be reversed engineered, Sony is the exact opposite. The consumer reaps the benefit. It's no wonder why Nikon is failing financially.  So here we have, yet another, excellent lens for the Sony E mount! I have 4 other recently made Tamron lens all purchased from BH! The 17-28, 70-180, 24mm (2). They all are incredibly sharp. Super quiet and extremely fast focusing. I don't see why this lens will be any different. It would have been nice to see a 5.6 aperture instead of 6.3 though. However, size and portability was a priority. I'm sure this will find a place in my bag. The price point is spot on too!

All good points, Yervant. The lenses Tamron has been releasing over the past couple of years certainly do make the Sony system enticing. It's worth noting that Sony has an advantage of time, so third party brands have had longer to adapt their manufacturing to Sony, whereas Nikon and Canon are still relatively new to the full-frame mirrorless game; it'll be interesting to see what they do in the years to come and if they'll continue strongly pushing for an enclosed system or if they'll eventually be more open like Sony. Regardless, it's great to see Tamron making a strong series of lenses right now.

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