Sigma 16-28mm f/2.8 DG DN C vs Sigma 17mm f/4 DG DN I C

It's a trade-off

Sigma 16-28mm f/2.8 DG DN C

£675.70from

More zoom range
Wider aperture
More aperture blades

Check price at eBay

Sigma 17mm f/4 DG DN I C

£361.67from, used

Cheaper
225g lighter
Closer focusing

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The short answer

The Sigma 16-28mm f/2.8 DG DN C offers a wider f/2.8 aperture and a more flexible focal range (16-28mm vs 17mm), while the Sigma 17mm f/4 DG DN I C offers a lower used price (£1,436.32 less), a lighter body (225g less) and closer minimum focusing. Both share a compatible lens mount.

Our take: If you're unsure, the Sigma 17mm f/4 DG DN I C is the safer value pick — step up to the Sigma 16-28mm f/2.8 DG DN C only if you want a wider f/2.8 aperture and a more flexible focal range (16-28mm vs 17mm).

Which should you buy?

It really comes down to aperture versus price — pick the one whose strengths match how you shoot.

Choose the

Sigma 16-28mm f/2.8 DG DN C

…if you want:

A wider f/2.8 aperture
A more flexible focal range (16-28mm vs 17mm)

Check price at eBay

Choose the

Sigma 17mm f/4 DG DN I C

…if you want:

A lower used price (£1,436.32 less)
A lighter body (225g less)
Closer minimum focusing

Check price at eBay

Full specifications

Show differences only

Specs	Sigma 16-28mm f/2.8 DG DN C	Sigma 17mm f/4 DG DN I C
Price	Price £675.70on eBay Check Amazon Price Check Ebay Price	Price £361.67used on eBay Check Amazon Price Check Ebay Price Cheaper
Brand	BrandSigma	BrandSigma
Sensor Format	Sensor Format Full-Frame	Sensor Format Full-Frame
Mount	Mount Sony E FE (Full-Frame)	Mount Leica L (Full-Frame) Sony E FE (Full-Frame)
Category	CategoryUltra Wide	CategoryUltra Wide
Use Case	Use Case ArchitecturalAstroLandscapeTravelVlogging	Use Case ArchitecturalLandscapeTravelVlogging
Focal Length	Focal Length16mm - 28mm	Focal Length17mm
Angle of View	Angle of View107 - 75.4°	Angle of View103.7 - 103.7°
Aperture	Aperture f/2.8 (max)f/22 (min) Wider aperture	Aperture f/4 (max)f/22 (min)
Blades	Blades9 Smoother bokeh	Blades7
Circular Aperture	Circular ApertureYes	Circular ApertureYes
Min Focus Distance	Min Focus Distance0.25m	Min Focus Distance0.12m Focuses closer
Max Magnification	Max Magnification1:5.6	Max MagnificationN/A
Filter Diameter	Filter Diameter72mm	Filter Diameter55mm
Weight	Weight450g	Weight225g Lighter
Stabilization	StabilizationNo (relies on camera)	StabilizationNo (relies on camera)
Auto Focus	Auto FocusYes	Auto FocusYes
Release Date	Release Date2022	Release Date2023
	View full detailsSigma 16-28mm f/2.8 DG DN C	View full detailsSigma 17mm f/4 DG DN I C