Introduction to Mirrorless Cameras for Underwater Photography
What is a mirrorless camera?
High-end compact alternative – mirrorless cameras are marketed as an alternative to high-end compact cameras, and are designed for amateur photographers. “Great image quality in a small size”.
Live View – these cameras have live view like a compact camera, not an optical viewfinder like a dSLR
No Mirror – the lack of an internal mirror allows the camera bodies to be a smaller size. FYI –the mirror in a dSLR, in conjunction with a pentaprism, reflects the image through the optical viewfinder. The mirror flips out of the way when a photo is taken.
Interchangeable lenses – unlike compact cameras, mirrorless cameras support different lenses
Mirrorless camera features & benefits
Larger Sensor - the sensor size of a mirrorless camera is much larger than a compact camera, resulting in more dynamic range, and less noise when using high ISOs. Greater depth of field than a dSLR at the same aperture
Contrast detection for focusing. These cameras focus more like a compact than like a dSLR, which uses the quicker phase-detection
Smaller lens size – lenses specifically designed for mirrorless cameras are often much smaller than equivalent dSLR lenses
HD Video with autofocus – the video from these cameras is quite nice
Kit lens with small zoom range. Some high-end compacts will give you a much larger zoom range for telephoto, because it is easier to make lenses with a large focal range for compact cameras
Lens mounts are available for many different “old” lenses, although they may not autofocus
Olympus E-PL2 Micro Four Thirds camera
Micro Four Thirds Cameras
The Olympus E-PL2, E-PL3, E-PM1, E-PL5, OM-D E-M1, E-M5, E-M10, Panasonic GX1, GF2 & GH3/GH4 are called Micro Four Thirds cameras.
What is a micro four thirds camera?
Most (but not all) mirrorless cameras are micro four thirds cameras. The name refers to the a standard created by Olympus and Panasonic, and also to the dimensions of the sensor in the cameras. You can read more here.
These cameras are becoming a popular niche in underwater photography. All share the same size Micro Four Thirds sensor, and have the same lens mount. This means that a lens for the E-PL2 can be used on the GF2/GH2, and vice-versa.
The sensor size is 6-9 times the size of a compact sensor, but half the size of a cropped sensor dSLR. Olympus dSLR cameras like the E520 and E5 share the same sensor, but a different lens mount than a Micro Four Thirds camera. Sensor size is 18mm x 13.5mm; 4x3 aspect ratio.
Some popular micro four thirds cameras:
Olympus E-PL2 – 12 megapixels, discontinuied. Popular choice in the US for a mirrorless camera.
Olympus E-PL1 – Discontinued. Almost the same as the E-PL2.
Olympus E-PL3 - 12 megapixels, discontinued. Replaces the E-PL2, with a new sensor and faster auto-focusing
Olympus E-PL5 - 16 megapixels, $499, same sensor as the OM-D E-M5
Olympus E-PL7 - newest of the PEN line, $699, read the full Olympus E-PL7 review here
Olympus E-PM1 - 12 megapixels, discontinued. Less expensive version of the E-PL3
Olympus OM-D E-M5- 16 megapixels, $999 for body only. High-end choice.
Panasonic GX1 - 16 megapixels, discontinued. Was a good high-end choice.
Panasonic GF2 – 12 megapixels, discontinued. Smallest mirrorless 4/3rds camera out there. Touch screen controls instead of dials.
Panasonic GF1 – top pick by Thom Hogan, http://www.bythom.com/compactmirrorless.htm but hard to find.
Panasonic GH2 – 16 megapixels, discontinued has great hi-def video quality of mirrorless cameras, best image IQ, very fast auto-focus. Larger sensor size.
Panasonic GH3/GH4 - these cameras takes some of the best professional video out there and are top picks for stills and video. You can see some sample Panasonic GH4 underwater video here.
Mirrorless Camera Underwater Housings
Olympus: By far the most popular underwater housings are the Olympus housings for the E-PL1, E-Pl2, E-PL3, E-PL5, E-PL7, E-PM1, considered a great value
10-bar: Makes mid-range housings for the E-PL1, GF-1, GF-2 and GH-1
Recsea makes top of the line housings for the E-PL1, GF-1, GF2, GH-1, NEX-5, NEX-5N, NEX-7 and GH-2
Nauticam makes housings for almost all of the mirrorless camera models, including the new Olympus OM-D E-M1 & Olympus OM-D E-M5
Aquatica, Acquapazza make NEX-5 & NEX-5N housings, all considered good quality. Aquatica also had a new housing for the Olympus OM-D E-M1.
Where to Buy
You can call the staff at Bluewater Photo for more advice on mirrorless cameras and mirrorless camera housings.
Part II - Mirrorless camera Lens Selection
Lens selection is very important when looking at mirrorless cameras, please read out guide to the best micro four thirds lenses for underwater photography. A guide to the best Sony NEX lenses will be coming soon.
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