SG-image 25mm f/1.8 X-Mount Lens vs SG-image 35mm f2.2 AF Full (2026): Key Differences
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When you compare the sg image 25mm f 1 8 x mount lens vs 35mm f2 2 af full, you are looking at two distinct prime lenses for mirrorless systems. Both share an all-metal build and autofocus capabilities. The primary difference lies in their sensor format and mount compatibility. One targets APS-C X-Mount cameras, while the other is designed for Full Frame Nikon Z bodies. Understanding these core specifications helps you choose the right tool for your specific camera gear.
Key differences
| Aspect | SG-image 25mm f/1.8 X-Mount Lens | SG-image 35mm f2.2 AF Full Frame Lens |
|---|---|---|
| Sensor Format | APS-C | Full Frame |
| Lens Mount | X Mount | Nikon Z |
| Focal Length | 25mm | 35mm |
| Maximum Aperture | f/1.8 | f/2.2 |
| Weight | 145g | not listed |
Which one should you choose?
Choose SG-image 25mm f/1.8 X-Mount Lens if
- You use an APS-C camera with an X-Mount
- You need a wider field of view for street photography
- You prioritize a brighter aperture for low-light situations
Choose SG-image 35mm f2.2 AF Full Frame Lens if
- You shoot with a Full Frame Nikon Z camera
- You prefer a classic 35mm perspective for portraits
- You want a lens compatible with multiple mount options like Sony E
Verdict: The SG-image 25mm f/1.8 is the practical choice for APS-C X-Mount users seeking a lightweight, fast prime. The SG-image 35mm f/2.2 suits Full Frame Nikon Z shooters who want a versatile, storytelling focal length. Your decision depends entirely on your camera body and desired field of view.
SG-image Lens Comparison Rounds
Sensor format
The SG-image 25mm f/1.8 X-Mount Lens is designed for APS-C sensors, while the SG-image 35mm f2.2 AF Full Frame Lens targets full-frame cameras. This fundamental difference dictates which camera bodies you can use. The 25mm lens is compatible with Fujifilm X-mount APS-C bodies. The 35mm lens supports Nikon Z, Sony E, and Leica L mounts for full-frame systems. Choosing the correct format ensures proper image coverage without vignetting. You must match the lens sensor format to your camera body sensor type for optimal performance and image quality.
Maximum aperture
Aperture controls light intake and background blur. The SG-image 25mm f/1.8 X-Mount Lens offers a maximum aperture of f/1.8. The SG-image 35mm f2.2 AF Full Frame Lens provides a maximum aperture of f/2.2. The f/1.8 setting allows more light to reach the sensor, which is beneficial in low-light environments. It also creates a shallower depth of field for stronger background bokeh. The f/2.2 aperture is still bright but slightly less capable in dark conditions compared to f/1.8. If you prioritize low-light shooting or creamy backgrounds, the wider aperture of the 25mm lens has a practical advantage.
Focal length
Focal length determines your field of view and perspective. The SG-image 25mm f/1.8 X-Mount Lens has a 25mm focal length. The SG-image 35mm f2.2 AF Full Frame Lens features a 35mm focal length. On their respective sensor formats, these provide different perspectives. The 25mm on APS-C offers a slightly wider view, good for street photography and environmental portraits. The 35mm on full-frame is a classic standard lens, often described as a natural perspective for storytelling. Your choice depends on whether you prefer a slightly wider frame or a more traditional view for landscapes and portraits.
Build quality
Both lenses emphasize durability and premium construction. The SG-image 25mm f/1.8 X-Mount Lens features a durable metal barrel and mount, offering a high-end tactile feel. It also includes a metal square lens hood. The SG-image 35mm f2.2 AF Full Frame Lens is constructed with a durable metal barrel and mount as well. Both share this robust all-metal build, ensuring long-lasting reliability for professional use. You get a similar tactile experience and sturdy feel with either option. The inclusion of a metal hood with the 25mm lens is a specific added value for that model.
Weight and size
Portability matters for travel and street photography. The SG-image 25mm f/1.8 X-Mount Lens weighs only 145g, making it ultra-lightweight. It is described as a perfect everyday carry prime lens. The SG-image 35mm f2.2 AF Full Frame Lens is also described as compact and lightweight, designed to keep your setup slim. However, specific weight data is not listed for the 35mm lens in the provided specifications. Based on the explicit data, the 25mm lens provides confirmed ultra-lightweight performance at 145g, which is a clear advantage for users prioritizing minimal gear weight.
Autofocus motor
Autofocus speed and noise affect video and still shooting. The SG-image 25mm f/1.8 X-Mount Lens uses an STM stepping motor for fast, silent, and precise focusing. This is ideal for both stills and video. The SG-image 35mm f2.2 AF Full Frame Lens is listed as having Auto Focus, but the specific motor type is not detailed in the provided data. The STM technology in the 25mm lens ensures quiet operation, which is crucial for video recording. Without specific motor details for the 35mm lens, the 25mm lens has a documented advantage in focus mechanism transparency and suitability for video work.
Choose Your Lens By Camera
X-mount camera owners on APS-C bodies
This lens is built for your Fujifilm X-mount system. It features a 25mm focal length that provides a natural perspective on APS-C sensors. The f/1.8 aperture allows for better low-light performance and subject separation. Its 145g weight makes it easy to carry for daily use.
Nikon Z users needing a standard prime
This option is designed for Nikon Z mount cameras with full-frame sensors. The 35mm focal length offers a classic field of view for portraits and street scenes. While the f/2.2 aperture is slightly slower than the 25mm, it still delivers strong low-light results and pleasing background blur for your images.
Full-frame shooters wanting versatile 35mm optics
If you shoot with full-frame bodies, this 35mm lens provides a true standard view. It is compatible with Nikon Z, Sony E, and Leica L mounts. The metal build ensures durability. The f/2.2 aperture balances size and light gathering, making it a practical choice for documentary and travel photography.
The products compared
SG-image 25mm f/1.8 X-Mount Lens
Best for: Lightweight street and portrait photography
- Lens Mount
- X Mount
- Focal Length
- 25mm
- Maximum Aperture
- f/1.8
- Sensor Format
- APS-C
- Focus Type
- STM Auto-Focus
- Dimensions
- 12.6 × 26.4 × 26.4 inches
View on Amazon: SG-image 25mm f/1.8 X-Mount Lens Affiliate link
This is an APS-C prime lens with an X-Mount. It features a bright f/1.8 maximum aperture and STM auto-focus. The lens weighs 145g and uses an all-metal build. It suits travelers and street photographers who need a lightweight, sharp lens for portraits or low-light scenes. The 25mm focal length provides a natural perspective on crop sensors.
Pros
- Weighs only 145g for easy carrying
- Bright f/1.8 aperture for low light
- STM auto-focus is fast and silent
- All-metal barrel and mount for durability
Cons
- APS-C sensor format only
- No image stabilization listed
- Fixed focal length limits versatility
Good fit if
- You shoot with Fujifilm X-mount cameras
- You prioritize lightweight gear for travel
- You want shallow depth of field
Skip if
- You need a full-frame lens
- You require zoom flexibility
- You shoot exclusively in bright daylight
Verdict: SG-image 25mm f/1.8 X-Mount Lens is a compact, sharp option for Fujifilm users. It fits those who value portability and low-light performance over zoom range.
SG-image 35mm f2.2 AF Full Frame Lens
Best for: Nikon Z full-frame street photography
- Lens Mount
- Nikon Z
- Focal Length
- 35mm
- Maximum Aperture
- f/2.2
- Sensor Format
- Full Frame
- Focus Type
- Auto Focus
- Color
- Black
View on Amazon: SG-image 35mm f2.2 AF Full Frame Lens Affiliate link
This SG-image lens is a 35mm prime designed for full-frame Nikon Z cameras. It features an f/2.2 maximum aperture for low-light performance and a natural perspective. The build uses an all-metal barrel for durability. At 1.4 inches long and weighing lightly, it remains compact for travel. You get autofocus capability in a sturdy, portable package suitable for street or documentary work.
Pros
- 35mm focal length for a natural perspective
- f/2.2 maximum aperture for low light
- All-metal barrel construction
- Compact 1.4-inch length
Cons
- f/2.2 is slower than f/1.8 competitors
- Nikon Z mount only for this listing
- No weather sealing mentioned in specs
Good fit if
- You use a full-frame Nikon Z camera
- You want a compact prime lens for travel
- You prefer metal build quality
Skip if
- You shoot with Sony E or Leica L mounts
- You need a faster f/1.8 aperture
- You require weather-sealed construction
Verdict: SG-image 35mm f/2.2 Nikon Z Full Frame Lens fits Nikon Z users who want a small, metal-bodied 35mm prime. It trades some speed for portability and build feel.
Specifications side by side
| Spec | SG-image 25mm f/1.8 X-Mount Lens | SG-image 35mm f2.2 AF Full Frame Lens |
|---|---|---|
| Lens Mount | X Mount | Nikon Z |
| Focal Length | 25mm | 35mm |
| Maximum Aperture | f/1.8 | f/2.2 |
| Sensor Format | APS-C | Full Frame |
| Focus Type | STM Auto-Focus | Auto Focus |
| Color | green | Black |
| Aperture | f/1.8 | not stated |
| Dimensions | 12.6 × 26.4 × 26.4 inches | 1.4 × 2.6 × 2.6 inches |
| Model | SGAF25f1.8XBLACK | not stated |
Frequently asked questions
Is the SG-image 25mm f/1.8 lens compatible with full-frame cameras?
No, this lens is designed for APS-C sensors. It mounts to Fujifilm X-mount bodies, which use smaller sensors. If you use a full-frame camera, this lens will not fit your mount or provide the intended field of view. It is strictly for APS-C systems.
Does the SG-image 35mm lens have autofocus?
Yes, the SG-image 35mm f2.2 AF Full Frame Lens features autofocus capabilities. This specification is listed in its attributes. It allows for faster subject tracking compared to manual-only lenses. This makes it suitable for street photography where quick focus acquisition is necessary.
What is the difference in aperture between these two lenses?
The 25mm lens has an f/1.8 maximum aperture, while the 35mm lens has an f/2.2 maximum aperture. The f/1.8 setting allows more light to reach the sensor. This provides better performance in low-light conditions and enables a shallower depth of field for portraits.
Which lens is better for portrait photography?
The SG-image 25mm f/1.8 X-Mount Lens is better for portraits on APS-C bodies. Its wider aperture creates more background blur. The 35mm lens is optimized for street photography on full-frame cameras. The 25mm focal length offers a natural perspective that flatters facial features.
Can I use the 35mm lens on a Fujifilm X-mount camera?
No, the SG-image 35mm f2.2 AF Full Frame Lens uses a Nikon Z Mount. It is physically incompatible with Fujifilm X-mount bodies. You must match the lens mount to your camera brand. The 25mm lens is the correct choice for Fujifilm X-mount users.
Is the SG-image 35mm lens made of metal?
Yes, the product description notes it has a metal body. This suggests a durable construction compared to plastic alternatives. The all-metal build contributes to its portability and solid feel. This design choice aligns with its target use for street photography.
Which lens offers a wider field of view?
The 25mm lens offers a wider field of view on its respective APS-C sensor. The 35mm lens provides a narrower, more telephoto perspective on full-frame sensors. The 25mm focal length captures more of the scene. This makes it ideal for tight indoor spaces or environmental portraits.