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SIRUI vs Tamron 18-

Updated July 2026 — SIRUI wins on aperture and portability, Tamron 18- wins on zoom range.

The SIRUI lens excels in cinematic quality and low-light performance, while the Tamron lens offers versatility and a broad zoom range.

Why SIRUI is better

Cinematic Quality

Superior low-light performance and wide aperture.

Build Quality

Lighter and more portable for filmmakers.

Specialization

Designed specifically for video production.

Why Tamron 18- is better

Versatility

16.6x zoom range for various photography scenarios.

Autofocus Speed

Faster autofocus mechanism for stills and video.

Value

Better average price over the last 90 days.

Overall score

SIRUI
85
Tamron 18-
88

Specifications

SpecSIRUITamron 18-
Focal Length20mm18-300mm
ApertureT1.8F/3.5-6.3
AutofocusSTM MotorVXD Motor
Weight1.06 lbs1.37 lbs
Price$599$599

Dimension comparison

SIRUITamron 18-

Overview of the SIRUI 20mm T1.8 Anamorphic Lens

The SIRUI 20mm T1.8 Anamorphic Lens is designed primarily for filmmakers and videographers, offering a unique 1.33x squeeze factor that enhances cinematic visuals. This lens is particularly appealing for its ability to create a stunning 2.35:1 widescreen ratio while maintaining a high level of image clarity. With a price of $599.00, it is positioned as a professional tool for those looking to achieve an immersive cinematic experience.

Overview of the Tamron 18-300mm Lens

The Tamron 18-300mm F/3.5-6.3 Di III-A VC VXD Lens is a versatile all-in-one zoom lens for Sony E APS-C mirrorless cameras, also priced at $599.00. This lens boasts a 16.6x zoom ratio, making it the world's first of its kind for APS-C mirrorless cameras. Its broad focal range allows photographers to capture everything from wide-angle landscapes to ultra-telephoto shots, making it a great choice for those who need flexibility in their shooting.

Focal Length and Versatility

The SIRUI 20mm lens is specifically designed for wide-angle cinematography, making it an ideal choice for capturing expansive landscapes and tight indoor spaces. In contrast, the Tamron lens covers a focal length range of 18-300mm, effectively bridging the gap between wide-angle and telephoto photography. This versatility allows users to switch from capturing broad vistas at 18mm to zooming in on distant subjects at 300mm. The broad zoom range of the Tamron lens provides a significant advantage for photographers looking to adapt to various shooting scenarios without needing to change lenses.

Autofocus Performance

Autofocus is a critical feature for both lenses, yet their approaches differ significantly. The SIRUI 20mm T1.8 utilizes a precision STM stepping motor for smooth and quiet autofocus, offering eye-tracking capabilities and an AF/MF switch. This makes it particularly well-suited for video creators who require reliable autofocus during shooting. On the other hand, the Tamron lens employs its VXD linear motor focus mechanism, known for its speed and precision. While both lenses provide excellent autofocus, the SIRUI lens may have the edge for filmmakers due to its specific features tailored for video production.

Aperture and Low-Light Performance

The SIRUI 20mm lens features an ultra-fast T1.8 aperture, which allows more light to enter, enhancing its low-light performance. This is crucial for capturing sharp images in dim conditions while also providing a pleasing bokeh effect. Conversely, the Tamron lens has a variable aperture ranging from F/3.5 to F/6.3, making it less effective in low-light situations. The SIRUI lens offers a significant advantage for nighttime or low-light shooting, where maintaining a fast shutter speed is essential for clear images.

Build Quality and Portability

Both lenses are designed to be compact and lightweight, but they cater to slightly different needs. The SIRUI 20mm weighs just 1.06 pounds (480g), making it exceptionally portable and ideal for handheld and gimbal shooting. In comparison, the Tamron lens weighs 21.9 ounces (approximately 1.37 pounds) and has a slightly bulkier design. While both lenses are moisture-resistant, the SIRUI's lighter weight may appeal more to filmmakers who prioritize mobility during shoots.

Price Comparison

Both lenses are priced at $599.00, making them equal in terms of initial investment. However, considering the Tamron lens has an average price of $663.09 over the last 90 days, it suggests that the Tamron might be perceived as a better value for those seeking a versatile zoom option. Both lenses offer solid features at this price point, but the SIRUI lens may have a more niche appeal for specific cinematic uses, while the Tamron offers broader photographic versatility.

Which should you buy?

Ultimately, the choice between the SIRUI 20mm T1.8 Anamorphic Lens and the Tamron 18-300mm F/3.5-6.3 Di III-A VC VXD Lens will depend on your specific needs as a photographer or videographer. If you're focused on creating cinematic content with a wide-angle perspective and superior low-light performance, the SIRUI lens is the better option. However, if you require a versatile all-in-one solution that covers a wide range of focal lengths for various photography scenarios, the Tamron lens stands out as an excellent choice. Each lens has its strengths, making the decision ultimately about your shooting style and requirements.