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S erounder vs Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens

Updated July 2026 — S erounder wins on weight and portability, Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens wins on price and build.

The Canon RF50mm F1.8 STM Lens offers superior optical performance and versatility, making it the better choice for serious photographers, while the fisheye lens is a budget-friendly option for creative effects.

Why S erounder is better

Price

The fisheye lens is significantly cheaper at $52.35.

Weight

The fisheye lens is lightweight at 228 grams.

Macro Feature

The fisheye lens can be divided for macro shooting.

Why Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens is better

Optical Quality

The Canon lens has a large f/1.8 aperture for low-light performance.

Versatility

The Canon lens is suitable for a wide range of photography styles.

Compatibility

The Canon lens is optimized for EOS R series cameras.

Overall score

S erounder
65
Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens
85

Specifications

SpecS erounder Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens
Focal Length37mm50mm
MaterialAluminum + GlassPlastic + Glass
Macro CapabilityYesNo
Compatibility37mm lensesEOS R series
ColorSilverBlack

Dimension comparison

S erounder Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens

Overview of the Products

In this comparison, we’ll look at the 37mm 0.25X Super Fisheye Lens Additional Lens and the Canon RF50mm F1.8 STM Lens. The fisheye lens is priced at $52.35, while the Canon lens comes in at $219.00, making the fisheye option about 76% cheaper. Each lens serves different photographic needs and has unique features that cater to various types of photography.

Design and Build Quality

The 37mm 0.25X Super Fisheye Lens features a sturdy design made from aluminum alloy and optical glass materials, ensuring durability. It weighs approximately 228 grams, making it lightweight and easy to carry in a storage bag included with the purchase. In contrast, the Canon RF50mm F1.8 STM Lens is compact and lightweight, designed specifically for the EOS R series mirrorless cameras. While the Canon lens does not specify a weight, its compact nature makes it convenient for photographers on the go. Both lenses emphasize portability, but the Canon lens is specifically optimized for use with EOS R cameras.

Optical Performance

When it comes to optical performance, the Canon RF50mm F1.8 STM Lens stands out with a large f/1.8 aperture, which is excellent for low-light photography and creating a beautiful background blur. The PMo aspherical lens design helps suppress aberrations, ensuring clear and sharp images. On the other hand, the 37mm 0.25X Super Fisheye Lens offers a unique fisheye effect, allowing for a wider picture range with a magnification of 0.25X. While the fisheye lens is specialized for creative photography, it may not deliver the same level of sharpness and detail that the Canon lens provides in standard shooting conditions.

Versatility and Use Cases

The versatility of the Canon RF50mm F1.8 STM Lens makes it suitable for a broad range of photography styles, from portraits to landscapes. Its fixed focal length encourages creativity in composition, making it a go-to lens for many photographers. Conversely, the 37mm 0.25X Super Fisheye Lens is specialized for specific shooting occasions, such as creative effects in landscapes or unique perspectives in architectural photography. While the fisheye lens offers specialized capabilities, its niche nature may limit its utility for everyday photography compared to the versatile Canon lens.

User Experience and Convenience

The 37mm 0.25X Super Fisheye Lens is designed with user convenience in mind. It comes with a storage bag and is lightweight, making it easy to transport for outdoor shoots. The lens can also be divided into two parts, allowing for macro close-up shooting with a 12.5 times magnification effect. Meanwhile, the Canon RF50mm F1.8 STM Lens features a control ring for quick and intuitive settings adjustments, enhancing the shooting experience. Both lenses prioritize ease of use, but the Canon lens provides more sophisticated features aimed at improving shooting efficiency.

Price and Value for Money

The 37mm 0.25X Super Fisheye Lens is priced at $52.35, making it a budget-friendly option for those looking to experiment with fisheye photography. In contrast, the Canon RF50mm F1.8 STM Lens commands a higher price of $219.00. Although the Canon lens is significantly more expensive, it offers robust optical performance and versatility that cater to serious photographers. For those on a tight budget or just starting, the fisheye lens presents excellent value, while the Canon lens justifies its higher price with superior features and quality.

Compatibility and Integration

The Canon RF50mm F1.8 STM Lens is specifically designed for compatibility with EOS R series mirrorless cameras, making it an ideal choice for users of that system. It integrates seamlessly with various camera models, providing optimized lens placement and coatings to deliver outstanding color balance. The 37mm 0.25X Super Fisheye Lens, while versatile in its applicability with any 37mm caliber camera lens, does not offer the same level of integration with camera systems. This makes the Canon lens a more reliable choice for users of the EOS R series.

Which should you buy?

Choosing between the 37mm 0.25X Super Fisheye Lens and the Canon RF50mm F1.8 STM Lens depends on your photography needs and budget. If you’re looking for a budget-friendly option to experiment with unique perspectives and creative effects, the fisheye lens is an excellent choice at $52.35. However, if you want a versatile, high-quality lens for a range of photography styles and are willing to invest $219.00, the Canon lens is undoubtedly the superior option. Each lens has its strengths, so consider your specific requirements before making a decision.