Comparison of Carl Zeiss 18mm f/3.5 Distagon T* 3.5/18 and Pentax SMC P-DA 14mm f/2.8 ED IF

Attribute	Carl Zeiss 18mm f/3.5 Distagon T* 3.5/18 ×	Pentax SMC P-DA 14mm f/2.8 ED IF ×
Diagonal Angle of View (degree)	99.00	90.00
Notes	Available SLR mounts: Canon EF (ZE), Nikon F (ZF, ZF.2), Pentax K (ZK). Lens shade included. Nikon ZF.2 version includes CPU interface for autoexposu	Included Accessories: Lens Hood
Aperture (f)	3.50 - 22.00	2.80 - 22.00
Magnification Ratio (x)	0.083	0.19
Filter Size (mm)	82	77
Type	Wide Prime	Wide Prime
Closest Focus (m)	0.3	0.17
APS Equivalent	1.5x: 27mm	21mm
Lens Construction	13 elements in 11 groups	12 elements in 11 groups
Image Circle	35mm	APS-C
Focal Length (mm)	18.00	14.00
Brand	Carl-zeiss	Pentax
Name	Carl Zeiss 18mm f/3.5 Distagon T* 3.5/18	Pentax SMC P-DA 14mm f/2.8 ED IF
Weight (g)	470	420
Diameter (mm)	87	83.5
Length (mm)	84	69
Diaphragm Blades	-	6
Focus Details	Manual focus only	Internal with "Quick Shift" AF/MF mechanism