SIRUI vs YONGNUO YN50mm F1.8C Lens, Large Aperture Auto Focus Lens,
Updated July 2026 — SIRUI wins on focal length and build quality, YONGNUO YN50mm F1.8C Lens, Large Aperture Auto Focus Lens, wins on weight and size.
The SIRUI lens excels in cinematic features and low-light performance, while the YONGNUO offers great value for general photography.
Why SIRUI is better
Cinematic Quality
SIRUI lens provides a 1.33x squeeze factor for a cinematic look.
Autofocus Features
SIRUI lens has advanced autofocus with eye-tracking.
Wide Aperture
SIRUI lens has a T1.8 aperture for better low-light performance.
Why YONGNUO YN50mm F1.8C Lens, Large Aperture Auto Focus Lens, is better
Price
YONGNUO lens is significantly cheaper at $132.29.
Compact Size
YONGNUO lens is smaller and lighter at 2 inches in length.
General Use
YONGNUO lens is versatile for everyday photography.
Overall score
Specifications
| Spec | SIRUI | YONGNUO YN50mm F1.8C Lens, Large Aperture Auto Focus Lens, |
|---|---|---|
| Max Aperture | T1.8 | F1.8 |
| Focal Length | 20mm | 50mm |
| Autofocus | Yes | Yes |
| Compatibility | E Mount | Canon EF |
| Field of View | 22mm FF | 46 degrees |
Dimension comparison
Price Comparison
The SIRUI 20mm T1.8 Anamorphic Lens is priced at $599.00, while the YONGNUO YN50mm F1.8C Lens comes in significantly lower at $132.29. This makes the YONGNUO lens about 78% cheaper than the SIRUI lens. For those on a budget or just starting in photography, the lower price point of the YONGNUO may be more appealing. However, for professionals or serious filmmakers looking for specialized features, the investment in the SIRUI lens may be justified by its unique capabilities.
Optical Quality
When it comes to optical performance, the SIRUI 20mm T1.8 Anamorphic Lens offers a wide T1.8 aperture that facilitates better low-light performance and enhances depth of field control. This lens also provides a 1.33x squeeze factor, allowing for a cinematic 2.35:1 widescreen ratio. In contrast, the YONGNUO YN50mm F1.8C lens features a standard 50mm focal length and a maximum aperture of F1.8, which is also beneficial for low-light scenarios. While both lenses provide excellent optical quality, the SIRUI lens excels in producing a cinematic look, making it ideal for filmmakers.
Autofocus and Manual Control
The SIRUI 20mm T1.8 lens is equipped with a precision STM stepping motor that offers smooth and accurate autofocus, along with features like eye-tracking capabilities and an AF/MF switch. This lens is designed to cater to both manual and autofocus needs, giving cinematographers complete control. On the other hand, the YONGNUO YN50mm F1.8C also supports both autofocus and manual focus but lacks the advanced tracking capabilities of the SIRUI. For users who prioritize a sophisticated autofocus system, the SIRUI lens stands out.
Build and Portability
The SIRUI 20mm T1.8 lens weighs 480g (1.06 lbs) and is compact, making it suitable for handheld shooting and gimbal use. This portability is a crucial factor for videographers and photographers who often work in dynamic environments. The YONGNUO YN50mm F1.8C, being a prime lens, is also compact and lightweight, measuring only 2 inches in length. While both lenses are portable, the SIRUI's design is specifically optimized for cinematic shooting, which may appeal more to filmmakers.
Focal Length and Field of View
The SIRUI 20mm lens provides a horizontal field of view equivalent to a 22mm full-frame lens, making it ideal for capturing expansive landscapes and tight indoor spaces. In contrast, the YONGNUO 50mm lens offers a maximum angle of view of 46 degrees. The difference in focal length significantly affects the type of shots each lens is suited for. For those interested in wide-angle shots or cinematic storytelling, the SIRUI lens is the better choice, while the YONGNUO lens is more suited for general photography and portraits.
Compatibility
The SIRUI 20mm T1.8 lens is specifically designed for E mount cameras, making it compatible with a range of models, including the A6500 and A7 series. The YONGNUO YN50mm F1.8C lens, on the other hand, is made for Canon EF mount cameras, which limits its compatibility to Canon models such as the 5D and 7D series. This difference in compatibility is significant for users who may already own specific camera systems, dictating which lens would fit seamlessly into their existing gear.
Target Audience
The SIRUI 20mm T1.8 lens is aimed at professional filmmakers and serious videographers who require advanced features for high-quality production. Its unique attributes cater specifically to cinematic work, making it a premium option. Conversely, the YONGNUO YN50mm F1.8C lens is targeted more toward amateur photographers and those looking for a budget-friendly lens to enhance their portrait and general photography skills. Each lens serves its target audience effectively, but the choice will depend on the user's specific needs and experience level.
Which should you buy?
Choosing between the SIRUI 20mm T1.8 Anamorphic Lens and the YONGNUO YN50mm F1.8C lens ultimately depends on your photography or videography goals. If you are a filmmaker seeking cinematic qualities and advanced autofocus features, the SIRUI lens, despite its higher price of $599.00, offers unparalleled benefits. However, for amateur photographers or those who require a versatile, budget-friendly option, the YONGNUO lens at $132.29 provides excellent value without breaking the bank. Assess your needs and budget carefully to make the best choice.

