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Tamron AF 28-75mm F2.8 XR Di LD Aspherical IF
vs
Sigma 24-70mm F2.8 EX DG Macro

x
Lens to replace
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Tamron AF 28-75mm f2.8 XR LD

Standard Zoom | Pentax KAF

Tamron AF 28-75mm F2.8 XR Di LD Aspherical IF
CHECK PRICE
BUY from B&H PHOTO
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Sigma 24-70mm F2.8 EX DG

Standard Zoom | Pentax KAF

Sigma 24-70mm F2.8 EX DG Macro
CHECK PRICE
BUY from B&H PHOTO

Tamron AF 28-75mm f2.8 XR LD vs Sigma 24-70mm F2.8 EX DG Comparison Overview

In this review, we will be comparing the Tamron AF 28-75mm f2.8 XR LD for the KAF Mount and the Sigma 24-70mm F2.8 EX DG for the KAF Mount, two Standard Zoom lenses from Tamron and Sigma.

We will start by looking briefly at the main specs of these two lenses, and in the following section, we will start analyzing them in more detail and listing the pros and cons of each lens.

Tamron AF 28-75mm f2.8 XR LD Key Specs

  • 28-75mm Focal Range
  • F2.8 Max Aperture
  • Filter Thread: 67mm
  • Max Format: 35mm FF
  • Pentax KAF Mount
  • Weight: 510g.
  • Diameter: 73mm
  • Length: 92mm
  • Min Focus Distance: 0.33m

Sigma 24-70mm F2.8 EX DG Key Specs

  • 24-70mm Focal Range
  • F2.8 Max Aperture
  • Filter Thread: 82mm
  • Max Format: 35mm FF
  • Pentax KAF Mount
  • Weight: 715g.
  • Diameter: 89mm
  • Length: 116mm
  • Min Focus Distance: 0.4m
  • Max Magnification: 0.26x
Tamron AF 28-75mm f2.8 XR LD Tamron AF 28-75mm f2..
Sigma 24-70mm F2.8 EX DG Sigma 24-70mm F2.8 E..
Tamron AF 28-75mm f2..
See at AMAZON
Sigma 24-70mm F2.8 E..
See at AMAZON

What type of photography are the Tamron AF 28-75mm f2.8 XR LD and Sigma 24-70mm F2.8 EX DG lenses good for?

The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron AF 28-75mm f2.8 XR LD and the Sigma 24-70mm F2.8 EX DG for their suitability to various photography scenarios:

Photography Type Tamron AF 28-75mm f2.8 XR LD Sigma 24-70mm F2.8 EX DG
Bird/WildlifeFairFair
SportsAverageAverage
PortraitVery GoodVery Good
TravelVery GoodVery Good
StreetVery GoodVery Good
WeddingVery GoodVery Good
Walk AroundVery GoodVery Good
VloggingVery GoodVery Good
LandscapeVery GoodVery Good


Size and Weight Comparison

The size of a lens is an important deciding factor when comparing two lenses. Sigma 24-70mm F2.8 EX DG is the longer of the two lenses at 116mm. The Tamron AF 28-75mm f2.8 XR LD with a length of 92mm, is 24mm shorter. Besides being longer, the Sigma 24-70mm F2.8 EX DG also has a larger diameter of 89mm compared to the Tamron AF 28-75mm f2.8 XR LD's 73mm diameter.

The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Tamron AF 28-75mm f2.8 XR LD weighs 510g, which means it is 205g (28%) lighter than the Sigma 24-70mm F2.8 EX DG which has a weight of 715g.


Below you can find the dimension and weight table of the Standard Zoom Lenses in Pentax KAF Mount for size comparison purposes.

Standard Zoom Lenses in Pentax KAF Mount for Size Comparison
Model Length Diameter Weight Street Price
Pentax smc DA 18-55mm F3.5-5.6 AL WR Lens Pentax 18-55mm F3.5-5.6 AL WR
68mm
69mm 230g Amazon B&H Photo
Tamron AF 28-80mm F3.5-5.6 Aspherical Lens Tamron AF 28-80mm f3.5-5.6
70mm
72mm 237g Amazon B&H Photo
Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF Lens Tamron 17-50mm f2.8 XR II LD
82mm
74mm 430g Amazon B&H Photo
Pentax smc DA 18-55mm F3.5-5.6 AL Lens Pentax 18-55mm F3.5-5.6 AL
68mm
68mm 225g Amazon B&H Photo
Pentax smc DA 18-55mm F3.5-5.6 ED AL II IF Lens Pentax 18-55mm F3.5-5.6 ED II
68mm
68mm 220g Amazon B&H Photo
Sigma 18-35mm F1.8 DC HSM Lens Sigma 18-35mm F1.8 DC HSM
121mm
78mm 810g Amazon B&H Photo

Lens Mounts

Both the Tamron AF 28-75mm f2.8 XR LD and the Sigma 24-70mm F2.8 EX DG has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III.

Tamron AF 28-75mm f2.8 XR LD is also available in Canon EF , Nikon F (FX) and Sony Alpha mounts.

Sigma 24-70mm F2.8 EX DG is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.

Focal Range

Tamron AF 28-75mm f2.8 XR LD has a focal range of 28-75mm and 2.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42 - 112.5mm.
Sigma 24-70mm F2.8 EX DG has a focal range of 24-70mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 36 - 105mm.

Reasons to choose Tamron AF 28-75mm F2.8 XR Di LD Aspherical IF over Sigma 24-70mm F2.8 EX DG Macro

Focal Length - Tele 75mm vs 70mm 5mm more Tele coverage
Aperture Ring Yes vs No able to adjust the aperture on the lens
Weight 510g vs 715g 205g lighter
Diameter 73mm vs 89mm 16mm smaller in diameter
Length 92mm vs 116mm 24mm shorter
Filter Thread 67mm vs 82mm Smaller filters are cheaper and easier to find
Minimum Focus Distance 0.33m vs 0.4m can focus closer to the subject

Reasons to choose Sigma 24-70mm F2.8 EX DG Macro over Tamron AF 28-75mm F2.8 XR Di LD Aspherical IF

Focal Length - Wide 24mm vs 28mm 4mm Wider coverage
Optical Zoom 2.90x vs 2.70x More flexible focal coverage
Diaphragm Blades 9 vs 7 Potentially more rounded and smooth bokeh
Max Magnification 0.26x vs x higher magnification better for close-up shots

Common Strengths of Tamron AF 28-75mm F2.8 XR Di LD Aspherical IF and Sigma 24-70mm F2.8 EX DG Macro
Internal Focusing Yes vs Yes Length of the lens doesn't change during focusing
Distance Scale Yes vs Yes Distance Scale to assist focusing
Depth-of-Field Scale Yes vs Yes Depth of Field scale to assist focusing
Common Weaknesses of Tamron AF 28-75mm F2.8 XR Di LD Aspherical IF and Sigma 24-70mm F2.8 EX DG Macro
Image Stabilization No vs No Reliant on in-body Image Stabilization
Internal Zoom No vs No Length of the lens changes during zooming
Weather Sealing No vs No not safe under rain and dust




**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate, I earn from qualifying purchases.

Tamron AF 28-75mm f2.8 XR LD vs Sigma 24-70mm F2.8 EX DG Specs Table

Detailed comparison of specifications
General
Brand Tamron Sigma
Lens Type Zoom Zoom
Price CHECK PRICE CHECK PRICE
Lens Type Standard Zoom Standard Zoom
Lens Mount Pentax KAF Pentax KAF
Max Format 35mm FF 35mm FF
Focal Range 28-75mm 24-70mm
Image Stabilization No No
Colour Black -
Zoom Method Rotary (extending) Rotary (extending)
Power Zoom - -
Zoom Lock Yes -
Zoom Ratio 2.7X 2.9X
Aperture
Max Aperture F2.8 F2.8
Min Aperture F32.0 F32.0
Aperture Ring Yes No
Diaphragm Blades 7 9
Optics
Optical Elements 16 14
Optical Groups 14 13
Focusing
Min Focus Distance 0.33m 0.4m
Max Magnification - 0.26X
Autofocus Yes Yes
AF Motor Type Micromotor Micromotor
Full Time Manual No No
Focus Method Internal Internal
Distance Scale Yes Yes
DoF Scale Yes Yes
Distance Scale Yes Yes
Focus Distance Limiter No No
Physical Specs
Weight 510g 715g
Diameter 73mm 89mm
Length 92mm 116mm
Weather Sealing No No
Filter Thread 67mm 82mm
Filter Notes non rotating -
Hood Supplied Yes Yes
Tripod Collar No No
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