Comparison of Pentax SMC P-DA 40mm f/2.8 Limited and Pentax SMC P-FA 43mm ƒ/1.9 Limited

Attribute	Pentax SMC P-FA 43mm ƒ/1.9 Limited ×	Pentax SMC P-DA 40mm f/2.8 Limited ×
Aperture (f)	1.90 - 22.00	2.80 - 22.00
Filter Size (mm)	49	5
Notes	Distance scale, Aperture ring, IR index. Included accessories: lens hood, soft case. Available in silver or black.	Distance scale
Closest Focus (m)	0.45	0.4
Magnification Ratio (x)	0.12	0.13
Type	Standard Prime	Standard Prime
Focus Details	Dedicated AF/MF	"Quick Shift" AF/MF mechanism
APS Equivalent	64.5mm	60mm
Diaphragm Blades	8	9
Image Circle	35mm	APS-C (but we found it didn't vignette on a 35mm film body)
Focal Length (mm)	43.00	40.00
Brand	Pentax	Pentax
Name	Pentax SMC P-FA 43mm ƒ/1.9 Limited	Pentax SMC P-DA 40mm f/2.8 Limited
Weight (g)	155	90
Diagonal Angle of View (degree)	53.00	39.00
Length (mm)	27	15
Diameter (mm)	64	63
Lens Construction	7 elements in 6 groups	5 elements in 4 groups