Pentax 50mm Prime Lens Shootout

Lens Specifications

For the most part, the three Pentax 50mm lenses have a lot in common although the D FA 50mm F2.8 macro is longer and heavier than either of the other 50mm's. The side-by-side specification table, seen below, highlights the differences between the lenses. The green cells emphasize the areas where the lens excels or is superior.

We feel that the fact that the D FA 50mm macro has an aperture ring is a real plus given that it's a macro lens, as the aperture ring lets you to use the lens with manual bellows and extension tubes.

Pentax DA 50mm F1.8

Pentax FA 50mm F1.4

Pentax D FA 50mm F2.8

Lens Construction

6 elements in 5 groups 7 elements in 6 groups 8 elements in 7 groups

Image Format

APS-C only (16 x 24) Full Frame (24 x 36)
APS-C (16 x 24)
Full Frame (24 x 36)
APS-C (16 x 24)

Angle of View

31.5° degrees diagonal
27° degrees horizontal
47° degrees diagonal FF
40° degrees diagonal FF
32° degrees diagonal APS-C
27° degrees horizontal APS-C
47° degrees diagonal FF
40° degrees diagonal FF
32° degrees diagonal APS-C
27° degrees horizontal APS-C

Min Focusing

18.9 inches (48cm) 18 inches (45cm) 7.67inches (20cm)

Max Magnification

0.15x 0.19x 1.0x

Autofocusing Type

Slotted Screw-drive Slotted Screw-drive Slotted Screw-drive

Mount Designation

KAF2 KAF2 KAF2

Filter Diameter Front

52mm 49mm 49mm

Maximum Aperture

F1.8 F1.4 F2.8

Minimum Aperture

F22 F22 F32

Aperture Ring

No Yes Yes

Diaphragm Blades

7 8 8

Focus Rotation

Counterclockwise Counterclockwise Counterclockwise

Internal Focusing

No No No

Weather Sealing

No No No

Full-time Man. Focus

No No Yes (Quick-shift)

Depth of Field Scales

No Yes Yes

Dimensions

2.5” x 1.5” (63 x 38.5mm) 2.5” x 1.5” (63 x 37mm) 2.6" x 2.4" (67.5 x 60mm)

Weight

4.3 oz. (122g) 7.8 oz. (220g) 9.3 oz. (265g)

Included Accessories

52mm Snap-on cap
Rear lens cap B

49mm Snap-on cap
Rear lens cap B

49mm Snap-on cap
PH-RBC 49mm
S80 80 lens case
Rear lens cap A

Price

Current (US): $224.95
MSRP $249.95
Current (US) $359.95
MSRP $449.95
Current (US) $439.95
MSRP $599.95

The prices listed above are based on B&H Photo's (an NYC retailer) August, 2012 pricing.


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