SIRUI vs Tamron 17-
Updated July 2026 — SIRUI wins on aperture, Tamron 17- wins on zoom range and focal length.
The SIRUI 20mm T1.8 excels in cinematic features, while the Tamron 17-70mm offers versatility for various photography styles.
Why SIRUI is better
Cinematic Features
Ideal for filmmakers with unique aspect ratio
Low-Light Performance
T1.8 aperture for better low-light shooting
Compact Size
Lightweight design for handheld shooting
Why Tamron 17- is better
Versatility
17-70mm zoom range for diverse photography
Optical Quality
16 elements for superior image quality
Moisture Resistance
Weather-sealed for durability in various conditions
Overall score
Specifications
| Spec | SIRUI | Tamron 17- |
|---|---|---|
| Price | $599.00 | $599.00 |
| Focal Length | 20mm | 17-70mm |
| Aperture | T1.8 | f/2.8 |
| Autofocus | Yes | Yes |
| Image Circle | Super 35 | APS-C |
| Weight | 480g | 525g |
Dimension comparison
Overview of the SIRUI 20mm T1.8 Anamorphic Lens
The SIRUI 20mm T1.8 Anamorphic Lens is designed specifically for E mount cameras and offers impressive features for cinematographers. Priced at $599.00, it stands out with its unique 1.33x squeeze factor, allowing filmmakers to achieve a stunning 2.35:1 widescreen ratio without cropping. This lens is tailored for APS-C or Super 35 sensors, providing excellent image clarity and a wide 20mm perspective, making it ideal for capturing expansive landscapes and tight indoor spaces. On the other hand, the Tamron 17-70mm f/2.8 Di III-A VC RXD Lens, also priced at $599.00, is a versatile zoom lens suitable for various photography needs.
Versatility in Focal Length
The Tamron 17-70mm f/2.8 offers a substantial advantage in versatility due to its zoom capabilities. With a focal length range of 17-70mm, it covers a broad spectrum from wide-angle to standard telephoto, equivalent to 25.5-105mm in full-frame terms. This makes it an excellent choice for various shooting scenarios, from landscapes to portraits. In contrast, the SIRUI 20mm lens is fixed, providing a wide-angle perspective that is great for creative shots but lacks the adaptability of a zoom lens. Thus, if you need a lens for varied photography styles and situations, the Tamron lens is the clear winner in this comparison.
Optical Performance
Both lenses boast impressive optical performance, but they are designed for different purposes. The SIRUI 20mm features a T1.8 ultra-fast aperture, which excels in low-light conditions, enabling clearer night scenes and softer bokeh. This lens is crafted to deliver cinematic visuals with a unique 1.33x squeeze, perfect for filmmakers looking to create dramatic footage. On the other hand, the Tamron 17-70mm lens includes 16 elements in 12 groups, incorporating two GM lens elements for outstanding image quality. While both lenses provide excellent sharpness and clarity, the SIRUI lens is more specialized for cinematic video work, whereas the Tamron shines in general photography.
Autofocus Capabilities
The SIRUI 20mm T1.8 features selectable manual and autofocus, powered by a precision STM stepping motor for smooth and quiet operation. It includes eye-tracking capabilities and an AF/MF switch, making it a great choice for fast-paced shooting environments. Meanwhile, the Tamron lens also features advanced autofocus capabilities that are optimized for Sony APS-C mirrorless cameras, incorporating AI technology for improved video shooting. Both lenses are equipped with effective autofocus systems, but the SIRUI lens's specialized features for filmmakers may give it an edge in specific scenarios.
Build Quality and Design
In terms of build quality, the SIRUI 20mm T1.8 lens is compact and lightweight at just 480g (1.06lbs), making it suitable for handheld shooting and gimbal work. Its design caters to cinematographers who prioritize portability without sacrificing performance. Conversely, the Tamron 17-70mm lens is also designed to be lightweight and features moisture-resistant construction with a fluorine coating, enhancing durability in various shooting conditions. While both lenses are built with quality in mind, the choice may depend on whether you prioritize compactness or weather resistance.
Price Comparison
Both the SIRUI 20mm T1.8 and the Tamron 17-70mm f/2.8 are priced at $599.00, making them equal in financial terms. However, it's important to consider the value each lens provides based on its specific features and intended use. If your primary focus is on filmmaking and creating cinematic visuals, the SIRUI lens presents a compelling option with its unique features. Conversely, the Tamron lens offers a versatile zoom range that can accommodate various photography styles and situations, potentially justifying its price for a broader range of users.
Target Audience
The SIRUI 20mm T1.8 is best suited for filmmakers and content creators who require a specialized lens for cinematic shots, particularly those using E mount cameras. Its unique characteristics make it ideal for capturing dramatic visuals. In contrast, the Tamron 17-70mm lens caters to photographers who need a reliable, everyday lens that can handle a variety of situations, from landscapes to portraits. This makes it an excellent choice for hobbyists and professionals alike who seek versatility in their gear.
Which should you buy?
Choosing between the SIRUI 20mm T1.8 Anamorphic Lens and the Tamron 17-70mm f/2.8 comes down to your specific needs. If you are a filmmaker looking to create cinematic visuals with unique aspect ratios, the SIRUI lens is the clear choice due to its specialized features and wide aperture. However, if you require a versatile lens that can handle a range of photography styles, the Tamron lens, with its broader zoom range and practical design, would serve you better. Ultimately, both lenses are priced the same, so your decision should be rooted in the type of photography or videography you plan to pursue.

