Sigma SD15


Key Features

  • Review Price: £789.00

I’ve been following the development of the unique Foveon X3 sensor since its first appearance in the Sigma SD9 back in 2002. Sigma now owns the Foveon company, and has continued to use this innovative technology in its cameras, including the DP2s compact camera which I reviewed back in June, as well as Sigma’s most recent DSLR the SD15.The Foveon X3 sensor works in a different way to the standard CCD and CMOS sensors found in every other digital camera.

Conventional camera sensors only record brightness, relying on a red, green and blue mosaic filter to provide colour information, and interpolating the full colour image from the results. The X3 sensor records full RGB colour at every photocell site on the sensor, thanks to three photocells embedded at different depths in a silicon wafer. You can find a fuller explanation with a diagram here. This difference causes some confusion when it comes to describing the true resolution of the sensor. Since it contains approximately 14 million individual photocells Sigma insists on calling it a 14 megapixel sensor. However the final image size is only 2640 x 1760 pixels, or 4.64 megapixels.

This lack of final resolution is also hard to ignore when one considers the price of the SD15. It is currently selling for £789 body only, which is very expensive compared to other digital SLRs. For the same price you could get an 18 megapixel Canon EOS 550D with an 18-135mm lens, a 14.6MP Pentax K-7 with a weather-resistant 18-55mm kit lens, or a Nikon D90 with an 18-105mm VR lens.

More from TrustedReviews

LG Q8 finally brings the V20’s promise to Europe

Atari is now in the speaker business… and the hat business

Thinner Moto Z2 Force could come with a huge trade-off

HyperLoop One

Elon Musk’s Hyperloop gathering pace as NY-DC link gets ‘OK’


Is this proof an N64 Classic will follow the SNES?

Agents of Mayhem preview

cats 17

Why you’ll want to download this OnePlus 5 update today

Golf rory

British Open Golf Live Stream: How to watch online for free

Call of Duty: Infinite Warfare for Xbox One down to under £9

Samsung Gear S3 finally gets Samsung Pay support in UK

Welcome to the all new Trusted Reviews

Netgear Arlo

Netgear Arlo Pro

Cat Amazon

Are you kitten me? Pet translation devices tipped for future smart homes

fire emblem warriors

Fire Emblem Warriors


Pokkén Tournament DX

TP-Link Smart Wi-Fi LED Bulb 5

TP-Link Smart Wi-Fi LED Bulb

Samsung Pay

Samsung Pay now lets you use your PayPal funds at the checkout

assassins creed origins

Ubisoft teases new games for Nintendo Switch, coming ‘quite soon’

amazon echo

Ask Vodafone: Mobile network’s first Amazon Alexa voice skill is revealed

Google Feed

The Google app’s new personalised feed might just drag you off Facebook

z2play 9

Moto Z2 Play

Mira Prism

For just $99 you can bring AR to the iPhone 7

Samsung Galaxy S8

Samsung Galaxy S9 displays may be the same, save one major new feature

movie theatre

The Netflix Effect: ‘Binge-watching’ is coming to movie theatres

Porsche MIssion E

Porsche’s latest electric car chargers put Tesla to shame

EE logo

EE’s new 20GB SIM-free deal is the best value tariff you’ll see all summer


These are the first images from the ISS – as captured by a zero-gravity drone

iMac 21.5-inch 4K (2017)

LG V30 case

LG V30 design ‘confirmed’ ahead of IFA 2017 launch

iPhone 7 vs iPhone SE

Waiting for the iPhone SE 2? Sadly, it could be a one-and-done

Google Glass Enterprise

Google Glass 2 has arrived, sort of

Denon AH-C621R

Denon AH-C621R

BBC Proms

Get ready to listen to the BBC Proms like never before

Fender Newport Monterey Bluetooth speakers

Fender’s new Bluetooth speakers look just like tiny guitar amps

Garmin Vivosmart 3

Garmin Vivosmart 3


Is the laptop travel ban dead? Electronics restrictions lifted by TSA but UK fails to follow suit

KitSound Immerse

KitSound Immerse Wireless Headphones


It’s World Emoji Day and Apple is showing off all of its newcomers

Porn Block

Privacy fears as UK plans age verification for porn sites


New WhatsApp feature could give Apple’s iMessage a run for its money