Sigma

Key features:

• Focal length: 50 - 100mm
• Aperture range: f/1.8-16
• Sigma SA mount lens
• APS-C format 
• Hyper sonic motor focusing (HSM)
• Internal zoom and focus
• 3 FLD glass and 1 SLD glass element
• Rounded 9-Blade Polycarbonate Diaphragm
• Tripod collar- fixed, rotating
• Super multi-layer coating

Key features:

• Focal length: 50mm
• Aperture range: f/1.4-16
• Sony E mount lens
• 35mm film / full-frame digital sensor format
• Hyper-sonic motor focusing (HSM)
• Incredible focal point sharpness when wide open
• Rounded nine-blade diaphragm
• Thermally stable composite material
• Sigma USB dock compatible

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:

• 50mm standard lens for L Mount
• Compatible with lens aberration correction
• Mount features a dust and splash-resistant structure
• Designed to minimize flare and ghosting
• Undergoes Sigma's MTF measuring system to ensure high quality
• 9-blade rounded diaphragm delivers an attractive blur
• Perfect for portraits, street, and everyday photography
• Switch between linear and non-linear focus ring settings 
• Compatible with Sigma USB Dock UD-11
• Comes with an LH633-01 lens hood

Key features:

• 50mm standard lens for Sony E Mount
• Compatible with high-speed autofocus and AF assist
• Full-frame lenses for best optical quality
• Mount features a dust and splash-resistant structure
• Designed to minimize flare and ghosting
• Undergoes Sigma's MTF measuring system to ensure high quality
• 9-blade rounded diaphragm delivers an attractive blur
• Perfect for portraits, street, and everyday photography
• Comes with an LH633-01 lens hood
• Includes an LCF58-01M magnetic metal lens cap

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

Key features:

• All-metal construction
• Full-frame compatible lens
• Incredibly compact and lightweight
• Manual aperture ring
• Classic standard focal length prime lens
• Fast maximum aperture of F2
• Magnetic lens cap and metal lens hood
• Mount with dust and splash-resistant structure
• Designed to minimize flare and ghosting
• Apt for Sony E Mount

Key features:

• All-metal construction
• Classic standard focal length prime lens
• Fast maximum aperture of F2
• Ideal focal length for portraits
• Manual aperture ring
• High-speed, accurate autofocus
• Magnetic lens cap and metal lens hood
• Mount with dust and splash-resistant structure
• Designed to minimize flare and ghosting
• Apt for L Mount

Key features:

• All-metal construction
• Classic standard focal length prime lens
• Fast maximum aperture of F2
• Incredibly compact and lightweight
• Manual aperture ring
• High-speed, accurate autofocus
• Magnetic lens cap and metal lens hood
• Mount with dust and splash-resistant structure
• Designed to minimize flare and ghosting
• Apt for L Mount