Comparison of Pentax SMC P-FA J 75-300mm f/4.5-5.8 AL and Pentax SMC P-FA 100-300mm f/4.7-5.8

Attribute	Pentax SMC P-FA 100-300mm f/4.7-5.8 ×	Pentax SMC P-FA J 75-300mm f/4.5-5.8 AL ×
Aperture (f)	4.70 - 32.00	4.50 - 38.00
Magnification Ratio (x)	0.26	0.3
Filter Size (mm)	58	58
Focus Details	-	Dedicated AF/MF
Closest Focus (m)	1.5	1.3
Lens Construction	11 elements in 9 groups	12 elements in 10 groups, including 1 aspherical element
Length (mm)	130	116
Focal Length (mm)	100.00 - 300.00	75.00 - 300.00
APS Equivalent	150 - 450mm	112.5 - 450mm
Brand	Pentax	Pentax
Image Circle	35mm	35mm
Name	Pentax SMC P-FA 100-300mm f/4.7-5.8	Pentax SMC P-FA J 75-300mm f/4.5-5.8 AL
Weight (g)	411	385
Type	Telephoto Zoom	Telephoto Zoom
Diagonal Angle of View (degree)	8.20 - 24.50	8.20 - 32.50
Diaphragm Blades	-	6
Zoom System	Rotary	Rotary
Diameter (mm)	71	69