Comparison of Pentax 50mm ƒ/1.8 SMC DA and Sony E 20mm f/2.8 SEL20F28

Attribute	Pentax 50mm ƒ/1.8 SMC DA ×	Sony E 20mm f/2.8 SEL20F28 ×
Filter Size (mm)	52	49
Aperture (f)	1.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.45	0.2
Magnification Ratio (x)	0.15	0.12
Type	Tele Prime	Wide Prime
Focus Details	Quick-shift Focus System for instant switching from auto to manual focus	Autofocus with stepper motor (quiet AF for movie capture); Direct Manual Focus supported.
APS Equivalent	76.5mm	30mm
Diameter (mm)	63	62.6
Image Circle	APS-C	APS-C (Sony E-Mount)
Focal Length (mm)	50.00	20.00
Brand	Pentax	Sony
Name	Pentax 50mm ƒ/1.8 SMC DA	Sony E 20mm f/2.8 SEL20F28
Weight (g)	122	69
Diaphragm Blades Type	rounded	rounded
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	31.50	-
Length (mm)	38.5	20.4
Notes	-	Sony E-Mount. Included Accessories: front and rear lens caps.
Lens Construction	6 elements in 5 groups; Front surface has SP (Super Protect) coating	6 elements in 6 groups, includes 3 aspherical surfaces