Modern 50mm Shootout: Pentax D FA* 50mm, Samyang 50mm, Pentax DA* 55mm F1.4

Specifications

The table below summarizes the specifications for the three lenses.

Lens Name

SMC Pentax-DA* 55mm F1.4

Samyang 50mm F1.4 AS IF UMC

HD Pentax-D FA* 50mm F1.4 SDM AW

Optical Formula

9 elements in 8 groups

9 elements in 6 groups 15 elements in 9 groups
Image Circle

APS-C (official)

Full frame (unsupported)

full frame Full frame
Auto-Exposure Support Yes Yes Yes
Construction Plastic (metal mount) Metal Metal
Field of View (diagonal / horizontal) APS-C: 29 ° / 25 °
Full frame: 43 ° / 36 °
APS-C: 32 ° / 27 °
Full frame: 47 ° / 40 °
Aperture Range F1.4 / F22 F1.4 / F22 F1.4 / F16
Aperture Blades 9 rounded 8 rounded 9 rounded
Aperture Ring No Yes, with A setting No
Max. Magnification 0.17X 0.15X 0.18X
Focus Type SDM, quick-shift Manual SDM, quick-shift
Minimum Focusing Distance 45 cm 45 cm 40cm
Internal Focus  Yes Yes Yes
Filter Thread Diameter 58 mm 77 mm 72mm
Cap Plastic clip-on O-LC58 Plastic clip-on Plastic clip-on, O-LC72
Hood Included, PH-RBH Included Included, PH-RBB72
Case Included, S90-100 Included Included, S100-140
Diameter x Length 70.5 x 66 mm 81.6 x 73.2 mm 80 x 106 mm
Weight 375 g 510 g 910g (hood: 45g)
Pentax Mount Designation KAF3 KA KAF4
Weather Sealing Yes No Yes
Price (US MSRP)

$646.95

$399 $1019.31
Launch Date

2008

2014 2018


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