Sigma 28-70mm F2.8 DG DN Contemporary Lens Compared to the Tamron 28-75mm f/2.8 Di III RXD Lens

SpecificationsSigma 28-70mm F2.8 DG DN Contemporary LensTamron 28-75mm f/2.8 Di III RXD Lens
  Sigma 28-70mm F2.8 DG DN Contemporary Lens Tamron 28-75mm f/2.8 Di III RXD Lens
Year Introduced20212018
Mounts OnFull-Frame, APS-CFull-Frame, APS-C
Lenses / Groups16/1215/12
Angle of View: Diagonal75.4° – 34.3°75° 23' - 32° 11'
 
Aperture  
Aperture Range - Wide / Long f/2.8-22 f/2.8-22
Number of Aperture Blades 9 9
Rounded Aperture? Y Y
 
Weight  
Manufacturer Specification Weight 16.6 oz  (470g) 19.4 oz  (550g)
Actual Weight 16.8 oz  (475.7g) 19.1 oz  (540g)
Lens Hood Weight 0.9 oz  (25.9g) 0.9 oz  (25g)
In-Use Weight 17.7 oz  (501.6g) 19.9 oz  (565g)
 
Size  
Manufacturer Spec Size (DxL) 2.84 x 4”  (72.2 x 101.5mm) 2.87 x 4.64”  (73 x 117.8mm)
Measured Size (DxL) 2.8 x 4.28”  (71 x 108.8mm) 2.87 x 4.84”  (72.8 x 123mm)
Max Length at Full Extension 5.18”  (131.6mm) 5.82”  (147.9mm)
Internal Zoom? / Extends with Zoom? N / Y N / Y
Zoom Extension Length 0.9”  (22.8mm) 0.98”  (24.9mm)
Internal Focusing? / Extends with Focusing? Y / N Y / N
Lens Hood Size (DxL) 3.38 x 1.5”  (85.8 x 38.1mm) 3.41 x 1.43”  (86.7 x 36.4mm)
Lens Length with Hood (Min-Max) 5.53 - 6.43”  (140.5 - 163.3mm) 5.99 - 6.97”  (152.1 - 177mm)
Size of Rings: Focus / Zoom 0.74” / 1.11”  (18.9mm / 28.2mm) 0.57” / 1.46”  (14.6mm / 37.2mm)
Filter Size 67mm  UV ► CP ► 67mm  UV ► CP ►
Front Element (Filter Mount) Rotates N N
 
Focus  
AF Motor Type Stepping Motor RXD Stepping
Full Time Manual Focus Y Y
Focus Ring Rotation 330° 1440°
Focus Limiter? / Focus Limiter Ranges N N
Distance Scale? / Type N N
 
Close Focus  
Specified Min Focus Distance 7.48”  (190mm) 7.48”  (190mm)
Tested Min Focus Distance (Wide / Long) 7.24” / 15.12”  (184mm / 384mm)
Maximum Magnification (MM) 0.22x 0.34x
 
Features  
Zoom Ring Rotation 60°
Tripod Ring Included? / Removable? N N
Zoom Ring Lock Switch? N
Lens Hood Included / Model? Y / LH706-01 Buy ► Y / HA036 Buy ►
Weather Sealed? / Filter Required? Y / Y /
Image Stabilization? / Stops? / Tripod Sensing? N N
Extender Compatible? N N
Case Included? / Type? N / N /
47.25" x 31.5" Subject Framing Distance 28mm = 3.24'
35mm = 4.06'
50mm = 5.92'
70mm = 7.92'
28mm = 3.39'
35mm = 4.12'
50mm = 5.95'
75mm = 8.49'
1200mm x 800mm Subject Framing Distance 28mm = 989mm
35mm = 1236mm
50mm = 1803mm
70mm = 2414mm
28mm = 1032mm
35mm = 1255mm
50mm = 1813mm
70mm = 2588mm
 
Review Sigma 28-70mm F2.8 DG DN Contemporary Lens Tamron 28-75mm f/2.8 Di III RXD Lens
 
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