Comparison of Pentax 15mm f/4 ED AL Limited HD DA and Pentax SMC P-FA 28mm f/2.8 AL

Attribute	Pentax 15mm f/4 ED AL Limited HD DA ×	Pentax SMC P-FA 28mm f/2.8 AL ×
Closest Focus (m)	0.18	0.3
Magnification Ratio (x)	0.15	0.11
Length (mm)	39.5	40.6
Focus Details	Internal, with "Quick-Shift" focus system	-
Diagonal Angle of View (degree)	86.00	75.00
Diaphragm Blades	7	-
Image Circle	APS-C	35mm
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Name	Pentax 15mm f/4 ED AL Limited HD DA	Pentax SMC P-FA 28mm f/2.8 AL
Brand	Pentax	Pentax
Weight (g)	189	185
Type	Wide Prime	Wide Prime
Lens Construction	8 elements in 6 groups	5 elements in 5 groups
Filter Size (mm)	49	49
Focal Length (mm)	15.00	28.00
Notes	Hood is built-in, pullout type; Available in black or silver; High-grade multi-layer HD (High Definition) coating	-
APS Equivalent	23mm	42mm
Diaphragm Blades Type	rounded	-
Diameter (mm)	63	63.5