This week’s issue of Amateur Photographer includes an article asking if sensor size matters with a digital SLR. The test compares results from the full frame Nikon D3, the APS-C Nikon D300 and the four thirds sensor Panasonic G1. I’ve got a vested interest in the test as my D700 uses the same sensor as the D3.

Spoiler alert – don’t read on if you want to know their findings. If I tell you all three cameras have the same number of pixels (12.3 MP) it should tell you the answer.

The “shocking” result was that the four-thirds sensor gave the most detail and therefore looked sharper in low ISO studio conditions. As the lighting conditions changed, the D3 came into its own, and gave consistent results past ISO 3200. The D300 slotted comfortably in between.

Why is this predictable? All three sensors have the same amount of pixels. So the G1 fits 12.3 million pixels into a sensor measuring 18 x 13.5mm. The D3 sensor is 36mm x 24mm. As the pixels are closer packed on the G1 they are able to record more detail, but also suffer from more noise in adverse lighting conditions.

This is the same reason that some wildlife photographers still maintain an APS-C body like the D300 alongside their full frame camera. If you are taking shots of a distant animal intending to crop them later you’ll potentially have more detailed shots as the pixels are more closely packed.

So why have a D3? Because amongst other things it’s consistent and reliable across all lighting conditions, not to mention the build quality and incredible AF. But only a priviledged few can afford to spend over £2000 on a camera. This article shows if you want a light camera that gives decent results in good lighting then the G1 is worth a look.