S erounder vs VILTROX AF
Updated July 2026 — S erounder wins on weight, VILTROX AF wins on autofocus and aperture.
The VILTROX AF 9mm F2.8 lens offers superior versatility and performance, making it the better choice for serious photographers. The 37mm fisheye lens is a budget-friendly option for creative effects.
Why S erounder is better
Price
37mm lens is significantly cheaper at $52.35
Weight
37mm lens is lighter at 228g
Special Effects
37mm lens provides unique fisheye effects
Why VILTROX AF is better
Versatility
VILTROX lens is suitable for various photography scenarios
Low-Light Performance
VILTROX lens has a bright F2.8 aperture
Autofocus
VILTROX lens features fast and silent autofocus
Overall score
Specifications
| Spec | S erounder | VILTROX AF |
|---|---|---|
| Focal Length | 37mm | 9mm |
| Aperture | Not specified | F2.8 |
| Magnification | 0.25X | N/A |
| View Angle | Wide | 113.8° |
| Material | Aluminum Alloy | Metal |
Dimension comparison
Overview of the Products
In this comparison, we will explore the 37mm 0.25X Super Fisheye Lens Additional Lens and the VILTROX AF 9mm F2.8 APS-C Lens for Sony E-Mount. The former is priced at $52.35, while the latter comes in at $199.00, making the fisheye lens about 73% cheaper than the VILTROX lens. These products cater to different photography needs, with the fisheye lens focusing on special effects and the VILTROX lens providing a broad focal range for versatile shooting.
Design and Build Quality
The 37mm 0.25X Super Fisheye Lens boasts a sturdy design made from aluminum alloy and optical glass, ensuring durability. Weighing approximately 228g, it’s compact and easy to carry, making it a convenient option for photographers on the go. In contrast, the VILTROX AF 9mm F2.8 APS-C Lens features a lightweight construction as part of its Air series, which also includes a metal lens mount and internal focusing. This design emphasizes portability, making it suitable for dynamic shooting situations. Both lenses demonstrate quality build, but the VILTROX’s compact design and enhanced materials position it as a more premium option.
Optical Performance
The 37mm 0.25X Super Fisheye Lens provides a unique fisheye effect, offering a wider picture range ideal for creative shots. Its 0.25X magnification allows for exaggerated perspectives, perfect for special occasions. On the other hand, the VILTROX AF 9mm F2.8 APS-C Lens delivers an impressive 113.8° ultra-wide-angle view. With a focal length equivalent to 13.5mm on full-frame cameras, it excels in landscapes, interiors, and vlogging. Both lenses offer distinct optical performances, but the VILTROX lens provides greater versatility across various photography scenarios.
Aperture and Low-Light Performance
The 37mm fisheye lens does not specify its aperture settings, which may limit its performance in low-light conditions. Conversely, the VILTROX AF 9mm F2.8 lens features a bright F2.8 aperture, facilitating excellent low-light shooting capabilities and creative background separation. This feature is particularly beneficial for astrophotography and capturing city nightscapes, making the VILTROX lens a better choice for photographers who frequently work in dim environments.
Autofocus Capabilities
The 37mm 0.25X Super Fisheye Lens is a manual lens, which may require more effort for focusing, especially in dynamic shooting situations. In contrast, the VILTROX AF 9mm F2.8 APS-C Lens is equipped with a high-precision STM stepping motor that provides fast and silent autofocus performance. This feature enhances the user experience for both photography and video shooting, allowing for smoother operation and quicker adjustments. For those prioritizing efficiency and ease of use, the VILTROX lens clearly stands out.
Versatility and Use Cases
The 37mm 0.25X Super Fisheye Lens is tailored for creative photography, lending itself well to special effects and unique angles. It is particularly suitable for specific photography occasions where a fisheye effect is desired. Conversely, the VILTROX AF 9mm F2.8 APS-C Lens offers a broader range of applications. Its ultra-wide-angle view and fast autofocus make it ideal for landscapes, vlogging, and capturing dynamic scenes. For versatility in various shooting scenarios, the VILTROX lens is the clear winner.
Price Comparison
The price difference between the two lenses is significant, with the 37mm 0.25X Super Fisheye Lens retailing for $52.35 and the VILTROX AF 9mm F2.8 APS-C Lens priced at $199.00. This means that the fisheye lens is about 73% cheaper, making it a budget-friendly option for photographers who want to experiment with creative effects without a hefty investment. However, the higher price of the VILTROX lens reflects its advanced features and versatility, which may justify the cost for serious photographers.
Which should you buy?
Choosing between the 37mm 0.25X Super Fisheye Lens and the VILTROX AF 9mm F2.8 APS-C Lens largely depends on your photography needs. If you are looking for an affordable option to explore unique creative angles, the fisheye lens is a great choice at $52.35. However, if you require a versatile, all-around lens that excels in various situations and provides excellent low-light performance, the VILTROX lens at $199.00 is worth the investment. Ultimately, your decision should align with your specific photography goals and budget.

