Sirui's compact anamorphic lens offering a 50mm focal length with 1.33x squeeze ratio. Combines affordable anamorphic cinematography with modern optical design, autofocus capability, and mirrorless camera optimization.
Definition
The Sirui 50mm 1.33x is a modern anamorphic lens specifically designed for mirrorless cameras, featuring a versatile 50mm focal length and gentle 1.33x squeeze ratio. Sirui bridges affordable anamorphic cinematography with contemporary features like autofocus and electronic aperture control.
Key Specifications
Optical Design
- Focal Length: 50mm (normal to slightly telephoto perspective)
- Squeeze Ratio: 1.33x (subtle anamorphic compression)
- Mount Options: Sony E, Fujifilm X, Canon RF, Nikon Z
- Autofocus: Yes - continuous autofocus capability
- Aperture Range: T2.9 at widest (variable depending on conditions)
- Format: Optimized for APS-C and full-frame mirrorless
Physical Characteristics
- Weight: Approximately 1.4 lbs (640g)
- Length: Compact form factor suitable for handheld operation
- Filter Size: Standard filter threads
- Construction: Modern weather-sealed design
- Mechanical: Electronic focus and aperture control
Optical Performance
Anamorphic Character
- Bokeh: Beautiful oval bokeh characteristic of anamorphic rendering
- Flares: Horizontal lens flares with natural anamorphic character
- Rendering: Smooth, slightly warm optical signature
- Sharpness: Good sharpness across frame with gentle edge rolloff
- Contrast: Balanced contrast, natural highlight rolloff
Resolution and Detail
- Sharpness: Excellent center sharpness, good throughout field
- Optical Aberrations: Minimal chromatic aberration
- Field Curvature: Flat field for consistent focus plane
- Vignetting: Subtle edge darkening typical of anamorphic design
- Distortion: Minimal geometric distortion
Focal Length Characteristics
50mm in Anamorphic Context
Perspective: Normal to slightly telephoto, flattering for medium shots and interviews
Coverage: Good balance between establishing shots and intimate framing
Shallow Depth: Strong bokeh rendering at wider apertures
Movement: Works well for subtle camera movements and parallax
Composition: Familiar 50mm perspective eliminates learning curve
Modern Features
Autofocus System
- Technology: Contrast autofocus with manual override
- Speed: Fast focus acquisition suitable for production pace
- Accuracy: Precise focus with minimal hunting
- Subject Tracking: Can track moving subjects
- Manual Focus: Full mechanical override always available
Electronic Aperture
- Control: Motorized aperture control via camera
- Precision: Smooth aperture adjustment without clicking
- Integration: Works with camera exposure metering
- Automation: Compatible with camera auto-exposure modes
Camera Integration
Native Mounts
- Sony E-mount: Full autofocus on Sony FX30, S1H, etc.
- Fujifilm X: Excellent compatibility with Fujifilm bodies
- Canon RF: Works with Canon EOS R5/R6
- Nikon Z: Compatible with Nikon full-frame mirrorless
Recommended Camera Bodies
Optimal Performance:
- Sony FX30 / FX3 (optimized for cinema)
- Panasonic S1H (full-frame anamorphic)
- Canon EOS R5C (high-resolution alternative)
- Fujifilm X-S20 / X-T5 (APS-C anamorphic)
Production Applications
Fast-Paced Shooting
Music Videos: Rapid camera movements with anamorphic character
Commercial Production: Quick setup and focus acquisition ideal for advertising
Social Media Content: Professional anamorphic look for digital platforms
Live Event Documentation: Autofocus enables responsive cinematography
Narrative Work
Dialogue Scenes: 50mm ideal for conversation cinematography
Close Encounters: Intimate framing with anamorphic rendering
Dynamic Drama: Suitable for faster-paced dramatic scenes
Indie Features: Budget-conscious feature film anamorphic work
Comparison: 50mm in Sirui 1.33x Lineup
| Focal Length | Character | Best Use |
|---|---|---|
| 24mm | Wide, Expansive | Establishing, Environmental |
| 35mm | Standard, Versatile | Dialogue, Medium Coverage |
| 50mm | Normal, Intimate | Close-ups, Telephoto Perspective |
| 75mm | Telephoto, Compressed | Intimate, Bokeh-Heavy |
Desqueezing Workflow
Post-Production Process
- Capture: Record 1.33x squeezed footage
- Proxy Creation: Generate editing proxies with desqueeze
- Final Desqueeze: Apply 1.33x horizontal stretch
- Color Grading: Assess Sirui color signature
- Delivery: Format according to distribution requirements
Software Support
- DaVinci Resolve: Native 1.33x squeeze/unsqueeze
- Premiere Pro: Custom scale transformation
- Final Cut Pro: Compound clip with scaling
- Nuke: Precision pixel-level manipulation
Advantages Over Cinema Anamorphics
| Aspect | Sirui 50mm 1.33x | Cinema Anamorphic (2x) |
|---|---|---|
| Cost | $$$ | $$$$ |
| Autofocus | Yes | No |
| Weight | Light | Heavy |
| Setup Speed | Quick | Moderate |
| Portability | Excellent | Limited |
| Anamorphic Character | Clear | Extreme |
| Electronic Control | Yes | No |
| Workflow Integration | Modern | Specialized |
Advantages Over Spherical Optics
- Anamorphic Aesthetics: Genuine horizontal flares and oval bokeh
- Widescreen Character: Distinctive 1.33x squeeze compression
- Optical Personality: Warm, characterful rendering
- Production Signature: Instantly recognizable anamorphic look
- Creative Tool: Optical effect not replicated in post-production
Practical Considerations
Workflow Advantages
- Autofocus Speed: Dramatically faster focus acquisition
- Aperture Control: Electronic integration with camera
- Compact Form: No follow-focus rig required
- Mobile Friendly: Suited for gimbal and handheld operation
- Quick Setups: Minimal technical complexity
Workflow Limitations
- Mirrorless Only: Not available for cinema camera systems
- EF/PL Mounts: Not available for traditional cinema cameras
- Contrast AF: May struggle in low-light conditions
- Electronic Dependency: Requires powered camera body
- Adaptation: May not suit all creative workflows
Typical Production Costs
- Purchase: $1,200-$1,800 per lens
- Rental: $150-$300/day (where available)
- Support Cost: Minimal (standard lens care)
- Upgrade Path: Compatible with future Sirui lenses
Image Examples
50mm Perspective on Different Camera Formats
Full-Frame Sony: Normal angle of view (SOV 40°)
APS-C Fujifilm: Slight telephoto SOV (27°)
Super-35 Equivalent: Moderate telephoto rendering
Maintenance
- Lens Care: Standard optical lens maintenance
- Cleaning: Use lens cleaning kit per manufacturer
- Storage: Protective case essential
- Servicing: Factory service available for major issues
Related Sirui Products
Sirui Anamorphic Series
- Sirui 24mm 1.33x: Wide anamorphic alternative
- Sirui 35mm 1.33x: Standard anamorphic focal length
- Sirui 75mm 1.33x: Telephoto anamorphic option
Sirui Premium Line
- Sirui 2.8x Premium: Higher squeeze ratio (future)
- Sirui Speedmaster Series: Fast spherical alternatives
Market Position
Sirui has established itself as the leading value-oriented anamorphic manufacturer, with the 50mm 1.33x representing an ideal balance of focal length, cost, and features for contemporary indie cinematography.
Production Testimonials
Users report:
- Exceptional value for anamorphic acquisition
- Faster production pace compared to cinema anamorphics
- Beautiful rendering on digital sensors
- Quick focus acquisition reducing stress
- Strong resale value
Future Roadmap
Sirui continues expanding anamorphic offerings:
- Additional focal lengths planned
- Premium higher-squeeze options
- Integration with cinema camera systems
- Enhanced stabilization features
Conclusion
The Sirui 50mm 1.33x represents democratization of anamorphic cinematography for contemporary creators. It brings professional anamorphic rendering to workflows emphasizing speed, mobility, and modern integration - perfectly suited to independent and mid-budget production realities.