Comparison of Zeiss 25mm f/1.4 Milvus 1.4/25 and Pentax 50mm f/1.4 SDM AW HD D FA*

Attribute	Zeiss 25mm f/1.4 Milvus 1.4/25 ×	Pentax 50mm f/1.4 SDM AW HD D FA* ×
Magnification Ratio (x)	0.22	0.18
Filter Size (mm)	82	72
Focus Details	Manual focus only	Ring-type SDM (Supersonic Direct-drive Motor)
Closest Focus (m)	0.25	0.4
Lens Construction	15 elements in 13 groups, including 2 aspherical and 7 anomalous partial dispersion elements; Enhanced Zeiss T* anti-reflective coating	15 elements in 9 groups, including 3 SLD (Super Low Dispersion) glass elements and 1 aspherical element
Length (mm)	123.3	106
Focal Length (mm)	25.00	50.00
Diaphragm Blades Type	rounded	-
Brand	Carl-zeiss	Pentax
Image Circle	35mm	35mm
Name	Zeiss 25mm f/1.4 Milvus 1.4/25	Pentax 50mm f/1.4 SDM AW HD D FA*
Weight (g)	1171	910
Type	Wide Prime	Standard Prime
Notes	Available lens mounts: Canon EF (ZE), Nikon F (ZF.2); Weather-sealed construction to protect against dust and moisture; Hood and lens caps included.	Dustproof, weather-resistant construction; Electromagnetic diaphragm
APS Equivalent	1.5x: 37.5mm; 1.6x: 40mm	75mm
Aperture (f)	1.40 - 16.00	1.40 - 16.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	81.20	47.00
Diameter (mm)	95.2	80