Why I Shoot Micro Four Thirds for Landscape Photography
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"Day four in Sarek. 15 kilometres behind me today and still about the same ahead. My knees and my back are done. I did get some great pictures along the way, though. I'm really glad I came."
Those lines come from my notebook, written somewhere in the middle of Sarek National Park in Swedish Lapland. The camera in my pack on that trip was a Lumix GX8, a Micro Four Thirds body I've since sold, but the system is still the one I rely on today. I think that notebook entry says more about how I use a camera than any spec sheet could: long days on foot, a heavy pack, and a camera that has to earn its place on my back.
Micro Four Thirds has a reputation as the sensor size nobody serious wants. I'm not going to tell you it's the best system ever made, because it isn't. But after carrying it across the Arctic, into the high mountains of Kyrgyzstan near the Chinese border, and up the steep peaks around my home in the French Alps, I've got a few solid reasons for sticking with it. More than anything, I want to make one point: a bigger sensor isn't automatically the better choice. It depends on what you actually shoot.
Myth 1: a bigger sensor is always better in low light
It sounds like simple physics: a bigger sensor gathers more light, so it must be better in the dark. In practice, what matters for noise at the pixel level is how much light each individual photosite receives. A photosite is the tiny light sensor that renders a single pixel, and the bigger it is, the cleaner the signal it produces.
That size doesn't only depend on the sensor, but also on how many megapixels you try to squeeze onto it. Compared with my G9, a 24-megapixel full-frame body like the Sony a7 III gets almost four times more light per photosite, a huge advantage. Move to the 33-megapixel a7 IV and it drops to about three times. Go to the 61-megapixel a7R IV and it's only around 1.5 times. Still an edge, but not an impressive one.
And here's the thing: when landscape photographers move to full frame or medium format, it's usually for the resolution. The more megapixels you chase, the more that low-light advantage melts away. For wildlife at dusk, handheld work, or anything where you need to freeze motion in poor light, a full-frame camera with a reasonable pixel count will genuinely do better. But my camera usually sits on a tripod. The mountain isn't going anywhere. Instead of cranking up the ISO, I simply use a longer exposure.
Myth 2: you need a big sensor for beautiful bokeh
Depth of field doesn't really come from the sensor itself. It comes from the focal length, the aperture, and the distance to your subject. To get the same framing of the same subject, a full-frame camera needs a 50mm lens where Micro Four Thirds needs a 25mm. The longer lens gives the full-frame shot a shallower depth of field. So yes, at equivalent framing, creamy backgrounds are easier on a bigger sensor, and for portraits or wildlife that's exactly what you want.
For landscapes, though, I usually want the opposite: the rock in the foreground and the peak in the background both sharp. On full frame or medium format, that means stopping down a lot, sometimes focus stacking, losing sharpness to diffraction, and possibly raising the ISO to compensate. You end up fighting against that so-called advantage.
The real advantage: telephoto reach
The same 2x crop factor means my 100-400mm lens gives me the reach of an 800mm on full frame, with the size, weight and price of a 400mm. In most kits, the long telephoto is the most expensive, heaviest and bulkiest piece. An 800mm-equivalent setup on full frame would be enormous.
Because mine is small and light, it's always in my pack, and that matters twice. When the conditions don't suit the big vista I had in mind, I can pick out distant ridgelines and details and still come home with photos. And when wildlife crosses my path, an ibex here in the Alps, a mountain goat in the US, a yak in Kyrgyzstan last year, or an eagle overhead, I can actually take the shot instead of wishing I hadn't left the bazooka at home.
Weight and bulk
Here are the numbers. My landscape kit is the Lumix G9, the Leica 12-60mm, the Leica 100-400mm and the Laowa 9mm. All together: about 2 kg for roughly 4,500 euros. The closest full-frame equivalent I could put together comes to about 3.8 kg and 6,200 euros, and it still doesn't match the reach of my 400mm.
My filters are smaller and cheaper, and my travel tripod with its ball head weighs under a kilo yet holds the G9 with the 100-400mm without complaint. A full-frame 800mm setup would need a tripod roughly twice as heavy.
For travel and street, I also carry a tiny Lumix GM5 with the 12-32mm, the 14-140mm or a 20mm f/1.7 prime. Every lens works on both bodies, so I get a serious landscape kit and a pocketable everyday camera from one system.
Choose for what you actually do
I'm not saying full frame or bigger sensors are wrong. They have real advantages for specific uses. But for landscape photography that involves hiking, trekking or anything physical, I think Micro Four Thirds is close to ideal, and it doesn't get enough love. If you're choosing a system, start from your actual needs rather than the spec sheet. For a lot of you, as it was for me, a smaller sensor might just be the right answer!
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