f/1.4 vs f/1.2 Mirrorless Lens: Which Should You Buy?
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Choosing between an f14 vs f12 mirrorless lens often comes down to your camera system and focus style. The Sigma 30mm F1.4 DC DN and the TTArtisan 50mm F1.2 both offer large apertures for low-light shooting and background blur. However, they target different mounts and focal lengths. The Sigma uses Sony E-mount with autofocus, while the TTArtisan uses Micro Four Thirds with manual focus. This affects compatibility and control.
Key differences
| Aspect | Sigma 30mm F1.4 DC DN Lens | TTArtisan 50mm f/1.2 Manual Focus Prime Lens |
|---|---|---|
| Lens Mount | Sony E | Micro Four Thirds |
| Focal Length | 30mm | 50mm |
| Focus Type | Autofocus (Stepping Ring Motor) | Manual Focus |
| Sensor Format | APS-C (DC Lens) | APS-C |
| Weight | 9.35 ounces | 336g (approx. 11.85 ounces) |
Which one should you choose?
Choose Sigma 30mm F1.4 DC DN Lens if
- You own a Sony E-mount camera and need reliable autofocus for street or portrait photography.
- You prefer a wider 30mm field of view on an APS-C sensor.
- You want a lighter lens for everyday carry.
Choose TTArtisan 50mm f/1.2 Manual Focus Prime Lens if
- You use a Micro Four Thirds camera and enjoy manual focus techniques.
- You want a classic 50mm perspective that mimics the human eye.
- You prioritize a slightly wider maximum aperture of f/1.2 for extreme low-light scenarios.
Verdict: The Sigma 30mm F1.4 is the better choice for Sony users who need autofocus and a versatile wider angle. The TTArtisan 50mm F1.2 suits Micro Four Thirds shooters who prefer manual control and a tighter portrait perspective.
Aperture and Build Comparison
Aperture Size
The most obvious difference is the maximum aperture. The Sigma 30mm F1.4 DC DN stops down to f/1.4. This allows plenty of light for low-light scenes and creates a shallow depth of field. The TTArtisan 50mm F1.2 goes wider to f/1.2. This one-stop advantage lets in more light. It also creates even stronger background separation. If you shoot in very dark environments, the wider opening helps. You get brighter images without raising ISO as high. The f/1.2 aperture is a clear technical win for light gathering.
Sensor Format
These lenses are designed for different sensor sizes. The Sigma 30mm is a DC lens, meaning it covers APS-C sensors. It is built for cameras with smaller sensors. The TTArtisan 50mm also lists APS-C in its key specs. However, it mounts to Micro Four Thirds cameras. This creates a mismatch in the data provided. The Sigma is strictly for Sony E-mount APS-C bodies. The TTArtisan is for M4/3 bodies but claims APS-C coverage. You must check your specific camera sensor size. Using the wrong lens can cause vignetting or black corners.
Focus Type
How you focus changes your shooting experience. The Sigma 30mm uses a stepping ring motor. This provides autofocus capabilities. You can rely on the camera to lock focus quickly. This is helpful for moving subjects or video. The TTArtisan 50mm is a manual focus lens. You must turn the focus ring yourself. This requires practice and patience. It is not suitable for fast action. However, manual focus can be more precise for portraits. You choose between convenience and control. The Sigma wins for ease of use.
Lens Mount
Mount compatibility is critical for your system. The Sigma 30mm fits Sony E-mount cameras. It works with a wide range of Sony bodies. The TTArtisan 50mm fits Micro Four Thirds mounts. It is compatible with Panasonic and Olympus cameras. You cannot swap these lenses between systems. Your choice depends entirely on your camera brand. If you own a Sony, the Sigma is your only option. If you use M4/3, the TTArtisan fits. Check your camera mount before buying.
Build and Weight
Physical handling differs between the two options. The Sigma 30mm weighs 9.35 ounces. It has a compact design with a stepping ring motor inside. The TTArtisan 50mm weighs 336 grams. This is approximately 11.8 ounces. It features an all-metal body. The metal construction feels durable and solid. The Sigma is lighter and potentially easier to carry. The TTArtisan feels more robust due to the metal. Both are portable for their class. The weight difference is small but noticeable in hand.
Which lens fits your workflow
Sony E-mount users needing autofocus
This lens uses the Sony E-mount and includes a stepping ring motor for autofocus. It features nine rounded aperture blades and weighs 9.35 ounces. The 30mm focal length offers a compact design suitable for everyday shooting. You get reliable performance without manual focus adjustments.
M4/3 photographers wanting wider aperture
This lens fits Micro Four Thirds cameras and offers an f/1.2 maximum aperture. It weighs 336 grams and features an all-metal body. The 50mm focal length mimics human-eye perspective. You get a wider opening for low-light scenes, though you must handle focus manually.
Users prioritizing compact manual optics
The TTArtisan lens measures 2.36 inches in length and weighs 336 grams. It uses ten diaphragm blades for background blur. The 50mm focal length is versatile for portraits and street photography. You accept manual focus to gain a wider f/1.2 aperture and lighter weight.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Sigma 30mm F1.4 DC DN Lens | APS-C portrait and low-light photography | Check price of Sigma 30mm F1.4 DC DN Lens on Amazon |
| 2 | TTArtisan 50mm f/1.2 Manual Focus Prime Lens | Manual focus portrait and low-light shooters | Check price of TTArtisan 50mm f/1.2 Manual Focus Prime Lens on Amazon |
The products compared
Sigma 30mm F1.4 DC DN Lens
Best for: APS-C portrait and low-light photography
- Aperture
- f/1.4 (what this guide is about)
- Lens Mount
- Sony E
- Focal Length
- 30mm
- Maximum Aperture
- F1.4
- Color
- Black
- Dimensions
- 2.55 × 2.89 × 2.89 inches
View on Amazon: Sigma 30mm F1.4 DC DN Lens Affiliate link
This Sigma lens offers a 30mm focal length with an f/1.4 maximum aperture for Sony E-mount cameras. It features a stepping ring motor and nine rounded aperture blades. The design is compact, measuring 2.89 inches long and weighing 9.35 ounces. It suits photographers who need a fast prime lens for low light or shallow depth of field on APS-C bodies.
Pros
- f/1.4 maximum aperture
- Stepping ring motor for focus
- Nine rounded aperture blades
- Compact 2.89-inch length
Cons
- Manual focus only
- APS-C crop sensor compatibility
- No image stabilization listed
Good fit if
- You shoot in low light
- You want shallow depth of field
- You use Sony E-mount APS-C cameras
Skip if
- You need autofocus
- You shoot full-frame only
- You require image stabilization
Verdict: Sigma 30mm f/1.4 Sony E-Mount delivers a fast aperture and compact build for APS-C users. It is a solid choice for manual focus shooters seeking background separation.
TTArtisan 50mm f/1.2 Manual Focus Prime Lens
Best for: Manual focus portrait and low-light shooters
- Aperture
- f/1.2 (what this guide is about)
- Lens Mount
- Micro Four Thirds
- Focal Length
- 50mm
- Maximum Aperture
- f/1.2
- Sensor Format
- APS-C
- Focus Type
- Manual Focus
View on Amazon: TTArtisan 50mm f/1.2 Manual Focus Prime Lens Affiliate link
This TTArtisan lens offers a 50mm focal length with an f/1.2 maximum aperture for Micro Four Thirds cameras. The all-metal body weighs 336g and measures 2.36 inches in length. You get a perspective close to the human eye, which helps create classic images. The large aperture allows for excellent background blur and strong low-light performance. It is designed for manual focus operation.
Pros
- f/1.2 maximum aperture for shallow depth of field
- 50mm focal length mimics human-eye perspective
- All-metal construction weighs only 336g
- 10 diaphragm blades for smooth bokeh
Cons
- Manual focus only
- Designed for APS-C sensor but listed for M4/3 mount
- No autofocus motor
Good fit if
- You want a lightweight lens for portraits
- You prefer manual focus control
- You shoot in low-light environments
Skip if
- You need automatic focusing
- You shoot full-frame cameras
- You require electronic aperture control
Verdict: TTArtisan 50mm F1.2 M4/3 Manual Lens is a compact manual option for M4/3 users who prioritize large apertures and portability over autofocus convenience.
Specifications side by side
| Spec | Sigma 30mm F1.4 DC DN Lens | TTArtisan 50mm f/1.2 Manual Focus Prime Lens |
|---|---|---|
| Lens Mount | Sony E | Micro Four Thirds |
| Focal Length | 30mm | 50mm |
| Maximum Aperture | F1.4 | f/1.2 |
| Sensor Format | not stated | APS-C |
| Focus Type | not stated | Manual Focus |
| Color | Black | Black |
| Aperture | f/1.4 | f/1.2 |
| Dimensions | 2.55 × 2.89 × 2.89 inches | 2.36 × 2.44 × 2.44 inches |
| Weight | 9.35 ounces | not stated |
| Size | 30mm F1.4 Lens | M4/3 |
| Model | 302965 | TTArtisan 50-f/1.2 M4/3B |
Frequently asked questions
Is f/1.2 worth the upgrade from f/1.4 for mirrorless cameras?
It depends on your need for extreme background separation. The TTArtisan 50mm f/1.2 offers a wider aperture than the Sigma 30mm f/1.4. This allows more light and a shallower depth of field. However, the f/1.2 option listed is manual focus only. Choose f/1.4 if you need autofocus convenience on APS-C bodies.
Can I use an f/1.2 lens for low-light photography?
Yes, both lenses handle low light well due to their large apertures. The Sigma 30mm f/1.4 provides a fast aperture for APS-C sensors. The TTArtisan 50mm f/1.2 allows even more light intake. Both are suitable for dim environments. The f/1.2 model requires manual focus, which may affect usability in fast-changing lighting conditions.
Which mirrorless mount supports these large aperture lenses?
The Sigma 30mm f/1.4 is designed for the Sony E-mount system. The TTArtisan 50mm f/1.2 is built for Micro Four Thirds cameras. You must match the lens mount to your camera body. The Sigma offers autofocus compatibility on Sony bodies. The TTArtisan requires manual focusing on M4/3 systems.
Are f/1.2 mirrorless lenses heavy and bulky?
Size varies by brand and mount. The Sigma 30mm f/1.4 weighs 9.35 ounces and measures 2.89 inches in length. It is compact for an APS-C lens. The TTArtisan 50mm f/1.2 is also small, measuring 2.36 inches long. Both options prioritize portability. The manual focus design helps keep the f/1.2 version lightweight.
Do I need autofocus for an f/1.4 lens?
Autofocus is helpful for speed and accuracy. The Sigma 30mm f/1.4 includes autofocus capabilities for Sony E-mount users. This makes it easier to capture moving subjects. The alternative f/1.2 lens is manual focus only. If you shoot portraits or static scenes, manual focus may suffice. For action or video, the autofocus f/1.4 is more practical.
How does focal length affect the choice between f/1.2 and f/1.4?
Focal length changes your field of view. The Sigma 30mm f/1.4 is a versatile prime for APS-C sensors. It offers a standard perspective for portraits and street photography. The TTArtisan 50mm f/1.2 provides a tighter angle of view. It is ideal for detailed portraits on M4/3 cameras. Choose based on your preferred framing distance.