I recently posted an article discussing how micro 4/3 cameras could achieve good depth of field at relatively wide apertures. This also stressed how the common advice to stop down the lens to a small aperture was misleading and probably resulted in poor lens performance and loss of image sharpness. Well, now it’s the turn of the LX5.
The LX5 is a compact camera with an oversized sensor and a great Leica lens that’s the equivalent of a 24-90mm lens on a full frame camera. Despite its oversized sensor, this is still much smaller than the Micro 4/3 cameras, which gives the LX5 a much greater depth of field at the same aperture.
I can only describe the lens on the LX5 as extraordinary in terms of sharpness and its ability to resolve detail, even in distant subjects. It has an aperture of f/2.0 at its widest to f/8.0 at the smallest. The f/2.0 can only be achieved with the lens set to the equivalent of 24mm. At the other end of the zoom range the widest aperture is f/3.5.
From my observations when using the LX5, the camera produces good images at any aperture and is certainly usable wide open (f/2.0). If I stop the lens down it start to hit its sweet spot by f/2.8 and performance begins to drop off after f/4.5. The question then, is how much depth of field do you get with f/2.8 and the lens set to 24mm (I am assuming here that you like I spend most of your time photographing landscapes)
To answer this question I am not going to resort to a depth of field phone app as I did before, but use a feature built into the LX5 which not only shows me the depth of field but allows me to set the hyperfocal distance. In case you’re not familiar with the term hyperfocal distance, this is the theoretical focus point that gives the maximum depth of field for your aperture/lens right the way to infinity. Here are the steps:
- Select the Aperture Priority mode (A) on the top dial of the camera.
- Switch the camera to manual focus using the switch on the side of the lens. When you are in Manual Focus, MF will appear in the bottom right of the screen.
- Press the rear adjustment dial on the back of the camera (top right) until the MF is highlighted. This is the dial that allows you to adjust the aperture and if you keep pressing it in you will cycle through aperture adjustment, exposure compensation and manual focus settings.
- Rotate the dial to the left and right. As you do this you will see a depth of field guide appear on the bottom of the camera screen with a solid yellow line that moves left and right. This line represents the zone of focus at the aperture and focus length selected.
- Move the dial left and right until the yellow line just touches infinite focus on the right hand side. You have now set the focus to give the maximum depth of field at your aperture and focal length.
To give you some idea of how much depth of field you can achieve at 24mm and f/2.8, you will find the closest point in focus is just over a meter away and the zone of sharp focus extends to infinity. Now the other benefit of shooting at f/2.8 is that you will achieve a very fast shutter speed and can hand hold even in poor light as well as reduce the risk of camera shake.
By way of an example, the night shot above was taken from the top of the Empire State Building hand held using ISO200 and f/2.8. Its pin sharp and prints beautifully at A3+. I have even passed it off at various presentations around the UK as being shot with a 5D MKII. I do always own up later as its great fun to see people’s faces when they realise it was shot with a compact camera.