Tamron 17- vs Tamron 70-
Updated July 2026 — Tamron 17- wins on weight, Tamron 70- wins on close focus and filter size.
The Tamron 17-70mm f/2.8 lens offers superior versatility and optical performance, while the 70-300mm lens provides excellent value for telephoto needs.
Why Tamron 17- is better
Versatility
Ideal for everyday photography with a constant f/2.8 aperture
Optical Quality
Advanced lens elements reduce aberrations
Close Focus
Close focusing capability of 7.5 inches at 17mm
Why Tamron 70- is better
Price
More budget-friendly at $399.00
Portability
Lighter and more compact for easy handling
Telephoto Range
Longer focal length for distant subjects
Overall score
Specifications
| Spec | Tamron 17- | Tamron 70- |
|---|---|---|
| Focal Length | 17-70mm | 70-300mm |
| Aperture | f/2.8 | f/4.5-6.3 |
| Elements | 16 elements | 15 elements |
| Groups | 12 groups | 10 groups |
| Moisture Resistant | Yes | Yes |
Dimension comparison
Overview of the Tamron 17-70mm f/2.8 Di III-A VC RXD Lens
The Tamron 17-70mm f/2.8 Di III-A VC RXD Lens for Sony E APS-C Mirrorless Cameras is a high-speed zoom lens that presents a versatile focal length range of 17-70mm. It is particularly suitable for those looking for a standard zoom lens that balances both quality and usability. Priced at $599.00, this lens is designed to provide outstanding optical performance with 16 elements arranged in 12 groups, including advanced lens elements that help in reducing aberrations and enhancing clarity. Its moisture-resistant construction and fluorine coating make it reliable for various shooting conditions, making it an appealing option for photographers who often work in changing environments.
Overview of the Tamron 70-300mm F/4.5-6.3 Di III RXD
In contrast, the Tamron 70-300mm F/4.5-6.3 Di III RXD is a telephoto zoom lens tailored for both Sony full-frame and APS-C mirrorless cameras. At a more budget-friendly price of $399.00, this lens boasts an impressive 70-300mm focal length range, which is equivalent to a 105-450mm field of view on APS-C cameras. With 15 elements in 10 groups, it is engineered to provide uncompromising image quality while remaining lightweight and portable, making it an excellent choice for photographers interested in wildlife, sports, and action shots. Its moisture-resistant design adds to its adaptability in various shooting environments.
Image Quality Comparison
Both the Tamron 17-70mm and 70-300mm lenses promise high image quality, but they cater to different shooting needs. The 17-70mm lens, with its constant f/2.8 aperture throughout the zoom range, ensures excellent low-light performance and depth of field control. The lens utilizes advanced optical technology, including two Glass Molded Aspherical elements, to minimize distortion and enhance sharpness. On the other hand, the 70-300mm lens excels in achieving beautiful bokeh and resolving power, specifically addressing chromatic aberrations common in telephoto lenses. While the 17-70mm lens is ideal for everyday photography, the 70-300mm lens offers the flexibility needed for distant subjects.
Portability and Build Quality
When it comes to portability, the Tamron 70-300mm is notably lighter and more compact. Weighing just 19.2 oz and measuring 5.8 inches in length, it is designed for easy handling and mobility, making it a great option for photographers on the move. In contrast, the 17-70mm lens, while still relatively lightweight, is bulkier due to its construction aimed at superior optical performance. Both lenses feature moisture-resistant construction, but the 70-300mm stands out for its lightweight portability, which can be a significant advantage during long shoots or travels.
Versatility of Use
The versatility of the 17-70mm lens shines in its ability to handle a variety of shooting scenarios, from landscapes to portraits, thanks to its 4.1x zoom ratio and close focusing capability of just 7.5 inches at 17mm. This makes it a practical choice for everyday photography. Meanwhile, the 70-300mm lens is tailored for more specialized applications, such as wildlife and sports photography, where distance is required. Its longer focal length allows for capturing subjects that are far away, making it less versatile for general use but highly effective for specific needs.
Autofocus and Performance
Both lenses incorporate advanced autofocus systems, but they cater to different performance needs. The 17-70mm lens features an upgraded VC (Vibration Compensation) mechanism that works in harmony with Sony APS-C cameras, leveraging AI for improved video shooting stability. This makes it particularly beneficial for those who shoot videos frequently. On the other hand, the 70-300mm lens employs the RXD (Rapid eXtra-silent stepping Drive) for quiet and precise autofocus, which is especially useful in environments where silence is crucial, such as wildlife photography. Each lens excels in its respective area, catering to different shooting styles and requirements.
Price Comparison
The price difference between the two lenses is significant, with the Tamron 17-70mm priced at $599.00 and the Tamron 70-300mm at $399.00. This means the 70-300mm lens is about 33% cheaper than its counterpart. While the higher price of the 17-70mm lens can be justified by its advanced features and optical quality, the 70-300mm lens offers excellent value for those who need a reliable telephoto option without breaking the bank.
Which should you buy?
Choosing between the Tamron 17-70mm f/2.8 Di III-A VC RXD and the Tamron 70-300mm F/4.5-6.3 Di III RXD ultimately depends on your specific photography needs. If you require a versatile lens for everyday photography and want the advantage of a constant f/2.8 aperture, the 17-70mm lens is the better choice. However, if you are looking for a budget-friendly telephoto option that excels in distance shooting, the 70-300mm lens offers great performance and portability at a lower price point.

