SIRUI vs Tamron 70-
Updated July 2026 — Tamron 70- leads on focal length and weight.
The SIRUI 20mm T1.8 excels in cinematic quality, while the Tamron 70-300mm offers versatility at a lower price.
Why SIRUI is better
Cinematic Quality
Ideal for filmmakers with unique features.
Low-Light Performance
T1.8 aperture enhances shooting in low light.
Compact Design
Lightweight and easy to handle for video work.
Why Tamron 70- is better
Price
More budget-friendly option.
Versatility
Suitable for various photography styles.
Telephoto Range
Long focal length for distant subjects.
Overall score
Specifications
| Spec | SIRUI | Tamron 70- |
|---|---|---|
| Autofocus | STM Motor | RXD Unit |
| Image Circle | Super 35 | Full Frame |
| Squeeze Factor | 1.33x | N/A |
| Construction | Compact | Lightweight |
| Use Case | Cinematic | Versatile |
Dimension comparison
Overview
The SIRUI 20mm T1.8 Anamorphic Lens is designed for filmmakers seeking a cinematic touch, while the Tamron 70-300mm F/4.5-6.3 is a versatile telephoto lens perfect for various photography styles. Each lens caters to different user needs, making them unique in their offerings.
The SIRUI lens is priced at $599.00, providing a specialized tool for creators wanting to achieve a wide-screen cinematic look. In contrast, the Tamron lens is available for $399.00, making it about 33% cheaper and an appealing option for photographers focused on capturing distant subjects without breaking the bank.
Design and Build Quality
The SIRUI 20mm T1.8 Anamorphic Lens is compact and lightweight, weighing only 480g (1.06 lbs), making it suitable for handheld shooting and gimbal use. Its design is tailored for filmmakers, ensuring ease of handling during shoots.
On the other hand, the Tamron 70-300mm F/4.5-6.3 lens is also designed for portability, measuring just 5.8 inches long and weighing 19.2 oz. Despite being a telephoto lens, it emphasizes lightweight construction, allowing photographers to maneuver easily in various shooting scenarios. Both lenses prioritize user-friendly designs but cater to different types of shooting experiences.
Optical Performance
The SIRUI 20mm T1.8 offers a 1.33x squeeze factor, producing a cinematic 2.35:1 widescreen ratio without cropping. This feature is ideal for filmmakers aiming for dramatic visuals. Additionally, the T1.8 aperture enables excellent low-light performance, enhancing depth of field control.
Conversely, the Tamron 70-300mm lens features 15 elements in 10 groups, ensuring uncompromised image quality across varying distances. It's particularly effective at reducing chromatic aberration, a common issue in telephoto lenses, allowing users to capture high-resolution images with beautiful bokeh. Each lens excels in its optical capabilities but serves different creative purposes.
Autofocus and Focus Control
The SIRUI 20mm T1.8 is equipped with a precision STM stepping motor, providing smooth and quiet autofocus, complete with eye-tracking capabilities. This feature is essential for videographers who need reliable focus adjustments while shooting.
In contrast, the Tamron 70-300mm incorporates an RXD unit, delivering a high-speed, quiet autofocus system that enhances the shooting experience for photographers. Both lenses offer advanced autofocus systems, but the SIRUI lens leans more towards video applications, while the Tamron is versatile for both stills and video.
Versatility in Use
The SIRUI 20mm T1.8 is particularly suited for wide-angle shots, making it ideal for capturing landscapes and tight indoor spaces. Its ability to create cinematic visuals is a strong selling point for filmmakers and vloggers.
The Tamron 70-300mm, however, shines in its versatility, capable of shooting from landscapes to wildlife photography with a focal length equivalent to 105-450mm on APS-C cameras. This makes it a fantastic choice for those who need a single lens that can handle a variety of shooting situations, from portraits to sports events.
Price and Value
Priced at $599.00, the SIRUI 20mm T1.8 is a significant investment aimed at serious filmmakers. Its unique features justify the cost for those specifically looking to achieve a cinematic aesthetic.
In contrast, the Tamron 70-300mm is priced at $399.00, making it a more budget-friendly option for a wider audience. The price difference of about $200 could be a deciding factor for users who need flexibility without a hefty price tag. While both lenses offer excellent value in their respective niches, the Tamron appeals to a broader range of photographers.
Target Audience
The SIRUI 20mm T1.8 Anamorphic Lens targets filmmakers and content creators who prioritize cinematic quality. Its design and features cater specifically to users looking for creative control in video production.
Conversely, the Tamron 70-300mm lens appeals to a diverse group of photographers, from hobbyists to professionals, who require a versatile lens for various types of photography. Its lightweight build and multiple applications make it suitable for anyone from nature photographers to portrait artists.
Which should you buy?
Choosing between the SIRUI 20mm T1.8 and the Tamron 70-300mm ultimately depends on your specific needs. If you are a filmmaker looking for a lens that provides unique cinematic effects and exceptional low-light performance, the SIRUI 20mm T1.8 at $599.00 is the right choice. However, if you are a photographer seeking a versatile, budget-friendly lens for various situations, the Tamron 70-300mm at $399.00 presents a compelling option. Each lens excels within its category, making your intended use the key determinant in this decision.