Sigma

Key features:

• Focal Length: 16mm
• Aperture Range: f/1.4 to f/16
• Fujifilm X-Mount Lens 
• APS-C Format
• 9 Rounded diaphragm blades
• 16 elements in 13 groups
• 3 FLD Glass elements
• 2 Special Low Dispersion (SLD) Elements
• 2 Molded Aspherical Glass Elements
• Super Multi-Layer Lens Coating

Key features:

• Focal length: 50mm
• Aperture range: f/1.4-16
• Leica L mount lens
• 35mm film / full-frame sensor
• Hypersonic motor focusing (HSM)
• Precision-molded aspheric lens element
• Rounded 9-blade diaphragm
• Brass bayonet mount
• Super multi-layer coating

Key features:

• Focal Length: 23mm
• Aperture Range: f/1.4 to f/16
• Fujifilm X-Mount Lens 
• APS-C Format
• Compatible with high-speed autofocus
• Stepping motor
• Compatible with lens aberration correction with supported cameras
• Lens Construction: 13 elements in 10 groups
• 3 Special Low Dispersion (SLD) Elements
• 2 Aspherical Glass Elements
• Super Multi-Layer Lens Coating
• Mount with dust and splash-resistant structure

Key features:

• Focal Length: 50mm
• Aperture Range: F1.4-F16
• Leica L Mount
• Lens construction: 14 elements in 11 groups (1 SLD and 3 aspherical lenses)
• HLA (High-response Linear Actuator)
• Super Multi-Layer Coating
• Water and Oil Repellent Coating (front element)
• AFL button and Focus Mode switch
• Support for switching between linear and non-linear focus ring settings (L-Mount only)
• Aperture ring with click switch and lock switch
• Dust and Splash Resistant Structure
• 11-blade rounded diaphragm
• High-precision, durable brass bayonet mount
• 72mm Filter Size