Focal Length and Versatility
The Samyang 85mm f/1.4 is a dedicated portrait lens offering classic compression and subject isolation, perfect for headshots and creative portraiture. The Tamron 17-70mm f/2.8 covers wide-angle to short telephoto ranges, making it ideal for travel, events, and general photography. The Tamron's zoom range eliminates lens changes but sacrifices the specialized portrait capabilities of the 85mm prime.
Aperture Performance and Image Quality
The Samyang's f/1.4 maximum aperture provides superior low-light performance and shallower depth of field for dramatic bokeh effects. While the Tamron's constant f/2.8 aperture is respectable across the zoom range, it can't match the 85mm's light-gathering ability or background blur potential. Both lenses deliver sharp images, but the Samyang excels in portrait-specific optical design.
Mount Compatibility and Features
The Samyang works with Nikon F-mount cameras, offering autofocus capabilities for DSLR users. The Tamron is designed for Fuji X-mount mirrorless systems with advanced stabilization (VC) and fast RXD autofocus motor. Each lens is optimized for its respective camera system, so your existing gear determines compatibility.
