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SIRUI vs VILTROX AF

Updated July 2026 — SIRUI wins on price and weight, VILTROX AF wins on focal length and aperture.

The Sirui lens offers superior cinematic features and low-light performance, while the Viltrox lens provides excellent value for casual photography.

Why SIRUI is better

Cinematic Features

Sirui lens has a 1.33x squeeze factor for a cinematic look.

Low-Light Performance

Sirui's T1.8 aperture excels in low-light conditions.

Advanced Autofocus

Sirui lens includes eye-tracking autofocus capabilities.

Why VILTROX AF is better

Price

Viltrox lens is significantly cheaper at $199.

Weight

Viltrox lens is lighter at 220g, enhancing portability.

Versatility

Viltrox lens is suitable for a wider range of photography styles.

Overall score

SIRUI
85
VILTROX AF
75

Specifications

SpecSIRUIVILTROX AF
AutofocusSTM with eye-trackingSTM with standard AF
Image CircleSuper 35Full Frame
Bokeh QualityExcellentGood
Optical Design1.33x squeeze13 elements
CompatibilityE MountNikon Z Mount

Dimension comparison

SIRUIVILTROX AF

Overview of the Sirui 20mm T1.8 Anamorphic Lens

The Sirui 20mm T1.8 1.33X Anamorphic Lens is designed specifically for E-mount cameras, offering a versatile option for filmmakers and photographers who require high-quality visuals. Priced at $599.00, this lens features a unique 1.33x squeeze factor that creates a cinematic 2.35:1 widescreen aspect ratio. Its wide T1.8 aperture allows for excellent low-light performance and beautiful bokeh, making it ideal for various shooting scenarios, from expansive landscapes to intimate indoor settings.

Overview of the Viltrox AF 50mm F2.0 Air Z Lens

On the other hand, the Viltrox AF 50mm F2.0 Air Z Lens is a compact and lightweight option for Nikon Z mount users, retailing at $199.00. With a large aperture of F2.0, this lens excels in producing a pleasing bokeh effect, enhancing portraits and everyday photography. Weighing only 220g, it is highly portable, making it suitable for vlogging and other on-the-go shooting needs. With its exceptional optical design, it promises clarity and minimal distortion, making it a robust choice for various photography styles.

Price Comparison

The price difference between the two lenses is significant, with the Sirui lens priced at $599.00 and the Viltrox lens at $199.00. This equates to a difference of $400, making the Viltrox about 67% cheaper than the Sirui. For budget-conscious photographers or those who don’t need the cinematic features of the Sirui lens, the Viltrox offers a strong value proposition without sacrificing quality. The significant price gap may sway users who are looking for a reliable standard lens without the premium cost.

Autofocus Capabilities

When it comes to autofocus capabilities, both lenses are equipped with advanced systems to ensure crisp, clear images. The Sirui lens uses a precision STM stepping motor, allowing for smooth and quiet autofocus with eye-tracking features, making it suitable for dynamic shooting environments. In contrast, the Viltrox lens also employs an STM motor, delivering reliable autofocus with a minimum focusing distance of 0.51m. While both offer effective autofocus, the Sirui lens may provide a slight edge in cinematic applications due to its additional tracking capabilities.

Aperture Performance

The Sirui lens boasts a T1.8 aperture, allowing for excellent light intake, which enhances its performance in low-light situations. This feature is particularly beneficial for filmmakers who shoot in varying lighting conditions and require depth of field control. The Viltrox, with its F2.0 aperture, also performs admirably, producing a beautiful bokeh effect thanks to its nine aperture blades. While both lenses excel in their respective applications, the Sirui lens's wider aperture gives it an advantage in challenging lighting scenarios, particularly for video work.

Design and Build Quality

The design and build quality of both lenses cater to their intended uses. The Sirui lens is compact yet robust, weighing 480g, making it suitable for handheld shooting and gimbal use. This makes it ideal for professional filmmakers who need durability without compromising on performance. Conversely, the Viltrox lens is significantly lighter at 220g, focusing on portability and ease of use for casual photographers and vloggers. Its compact size makes it an excellent choice for on-the-go shooting. Both lenses are well-constructed, but their design philosophies cater to different user needs.

Optical Quality

Optical quality is paramount for any lens, and both the Sirui and Viltrox have unique strengths. The Sirui lens features a 1.33x squeeze factor that delivers a cinematic aesthetic with a horizontal field of view equivalent to a 22mm full-frame lens. This makes it highly effective for landscape and architectural shots. The Viltrox lens, on the other hand, is designed with 13 elements in 9 groups, including three ED lenses and one aspherical element, ensuring vivid and distortion-free images. While both lenses deliver excellent optical performance, the Sirui might be more suitable for those seeking a cinematic look.

Which should you buy?

Choosing between the Sirui 20mm T1.8 Anamorphic Lens and the Viltrox AF 50mm F2.0 Air Z Lens ultimately depends on your specific needs. If you are a filmmaker looking for a high-quality, cinematic lens that excels in low-light conditions and offers advanced autofocus features, the Sirui lens is worth the investment at $599.00. However, if you are a casual photographer or vlogger seeking a versatile, lightweight standard lens that is budget-friendly at $199.00, the Viltrox lens provides exceptional value without compromising on quality.