Comparison of Sigma 70mm f/2.8 DG Macro Art and Tamron 90mm ƒ/2.8 Di MACRO 1:1 VC USD SP (Model F017)

Attribute	Tamron 90mm ƒ/2.8 Di MACRO 1:1 VC USD SP (Model F017) ×	Sigma 70mm f/2.8 DG Macro Art ×
Filter Size (mm)	62	49
Notes	Available mounts: Canon EF, Nikon F, Sony A; Optical Image Stabilization (3.5 stops); Weather resistant; Compatible with TAMRON TAP-in Console	Available AF Mounts: Sigma SA, Canon EF, L-Mount, Sony E; Dust- and splash-proof construction
Closest Focus (m)	0.3	0.26
Magnification Ratio (x)	1	1
Type	Telephoto Prime Macro	Telephoto Prime Macro
Length (mm)	116.8	105.8
APS Equivalent	1.5x: 135mm; 1.6x: 144mm	1.5x: 105mm; 1.6x: 112mm
Diagonal Angle of View (degree)	27.00	34.30
Image Circle	35mm	35mm
Focal Length (mm)	90.00	70.00
Brand	Tamron	Sigma
Name	Tamron 90mm ƒ/2.8 Di MACRO 1:1 VC USD SP (Model F017)	Sigma 70mm f/2.8 DG Macro Art
Weight (g)	610	515
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	rounded
Lens Construction	14 elements in 11 groups, including 2 XLD (Extra Low Dispersion) and 1 LD (Low Dispersion) elements; eBAND and BBAR coatings	13 elements in 10 groups, including 2 aspherical elements, 2 FLD glass elements, 2 SLD glass elements, and one element with a high rate of anomalous
Diameter (mm)	79	70.8
Focus Details	Internal; USD (Ultrasonic Silent Drive) with continuous manual focus mechanism	Internal with focus-by-wire system using coreless DC motor; full-time manual override (see release text)