The Olympus TOUGH TG-5 waterproof adventure camera has a built-in zoom lens. When you combine with the 4.5mm lens with the small-sized sensor, you get the equivalent field of view of around what a 25mm lens would look like on a full-frame camera (ie. 35mm equivalent).
Olympus is now OM System
In 2020-21, the photography business of iconic camera brand Olympus was spun off and sold. The core remaining Olympus brand is focusing on medical and scientific products. The camera and photography side was then rebranded as OM System, with the first cameras and lenses under that brand coming out at the end of 2021.
While 25mm is relatively wide, there are times you might want even wider, especially when shooting underwater.
Olympus has their own solution: a waterproof fisheye lens that snaps onto the front of the camera. It’s compatible with all of the Olympus Tough TG series cameras going back to the TG-1. I’ve been using it on the TG-5.
- Adds ultra wide-angle fisheye perspective quickly and easily
- Works underwater
- Simple to use
- Compatible with all recent Olympus TOUGH TG-# models
- Bulky (on such a small camera)
- Partially blocks on-camera flash
- Smudges and water drops on glass can negatively impact image quality
UPDATE: Since I originally posted this, OM System has released the Olympus TOUGH TG-6. It’s only a minor upgrade, and this lens adapter will also work on the newer model.
The pack is a bundle of two products that work together.
The first is the adapter that lets you connect the lens to the camera. Its model number is CLA-T01 and it’s just a metal adapter ring—there’s no glass. In most instances, it’s not going to do you much good by itself, but there is one advantage to using it alone and leaving it attached to your camera: it lets you clip on a lens cap (one is included with the CLA-T01; its product number is LC-40.5 and it’s a 40.5mm cap). Without the adapter there’s no way to clip on a lens cap.
The most important part of it is the FCON-T01 Fisheye Converter. That is the lens itself. In addition to the main lens itself there are front and back caps for it.
It’s basically a piece of glass. There are no moving parts. No aperture blades. No focus or aperture rings. So there’s not much that can go wrong. At the same time, there are limits to its flexibility and some things to watch out for.
It comes with front and back caps.
Since the point of this lens is to add a super-wide perspective, I’ll start with some examples of what difference it makes. Below are some side-by-side shots with and without the fisheye attached. With a magnification of 0.76x, it brings the effective focal length out to 19mm.
In addition to the wider perspective, an obvious difference is the distortion with the bowing of the horizon.
Size and Weight
The lens snaps onto the front of the camera. Even though it’s only a little over an inch deep, when attached to such a small camera it makes the whole package quite a lot larger, bringing it closer to a small mirrorless setup. It will still fit in large pockets, but it’s nowhere near as compact as the camera without the lens.
And, relatively speaking at least, it’s quite hefty. It weighs about 4 1/2 ounces (130 grams, approximately). That doesn’t sound like a lot, but relative to the camera itself, it’s half the weight of the camera alone (8.7 ounces / 247 grams).
The fisheye lens pack works well enough above water, but it probably makes most sense for underwater use. Because of the natural magnification when shooting through water, the extra width that the fisheye offers comes in handy for underwater shooting.
According to Olympus’s own in-house testing, it has a waterproof rating equivalent to IPX8, which means it can be used up to 65 feet deep (20 meters) of water for at least 60 minutes.
That makes sense, because this is basically glass that simply attaches to the camera. Attaching it doesn’t expose any of the camera’s interior—it’s a purely external attachment.
Doesn’t Reduce Aperture
Unlike something like a teleconverter, which reduces the usable aperture range, this lens doesn’t. You can still use f/2 and f/2.8 (you’ll have to use smaller apertures if you zoom in because the camera doesn’t use a constant maximum aperture throughout the zoom range). Of course, adding extra glass to the front does in fact cut down on the amount of light hitting the sensor—that’s just physics—and it has to come from somewhere, but the exposure is compensated in the calculations for shutter speed and ISO so as not to change the usable aperture range.
It doesn’t magically improve the TG-5’s low-light performance, but at least it minimizes the impact.
If you add a large chunk of glass to the front of the lens you can expect to lose some sharpness. And you do with this lens. I was pleasantly surprised with how sharp it remained in much of the center of the frame, but it’s definitely very soft around the edges.
Here’s an example shot at f/8 (click on it to load a full-size version).
The lens does add quite a lot of distortion, as you’d expect. It’s most noticeable when shooting out of the water, especially when there are straight lines like horizons or buildings.
Whether that bothers you is entirely a matter of preference. But here are some examples of the kind of bulging fisheye look you can get.
It also very much depends on where you’re pointing the lens. If you angle the lens down from the horizon, for instance, you’ll get a definite bow in the horizon.
But this shot was taken with the same setup from the same spot but just centering the horizon vertically in the frame. It’s the midpoint of the distortion so results in an essentially straight horizon.
Using it Out of the Water
It does work well above water, with some caveats that aren’t unexpected. You do lose some sharpness, and the edges of the frame get quite soft. It also accentuates chromatic aberration (purple fringing) (just the basic lens, without the fisheye adapter, does exhibit some purple fringing in some circumstances; the fisheye adapter makes it more prominent and more common).
Using it for Split Over/Under Photos
The front face of the fisheye lens is quite large. That makes it easier to do split over/under photos, where part of the frame is below the water and part is above the water. It’s still a bit tricky—trickier than when using a large dome port, for instance—but it can be done.
One thing I did find though is that it can throw off the camera’s focusing system. So the results can be a bit hit and miss. Here’s an example where the focus got confused.
Another issue I’ve run into is that the extra surfaces add more places for water droplets to stick to and an even shallower depth of field. So it’s pretty easy to end up with water droplets on the glass interfering with your photo.
Notes & Things to Watch Out For
Compatibility. The adapter is compatible with all of Olympus’s TG-X series from TG-1 through TG-6. The packaging has a sticker that says it’s compatible with the TG-3 and TG-4. It’s also compatible with the TG-5 and TG-6, but the packaging materials haven’t yet caught up with the newer models.
Using Flash. The lens is large and partially obscures the flash. You can still shoot with the flash, but you’ll end up with a darker part of the frame that’s in the lens’s shadow.
Possible Interference. Some of the camera’s functions, like autofocus, stabilization, and automatic exposure might get a bit thrown off by the lens with inconsistent results.
Smudges & Water Drops. Because the front element of glass is large, flat, and flush with the front, it’s very easy to get finger smudges, sunscreen, and water drops on it. Combined with the very close focusing that the super-wide angle brings, those can easily interfere with the image quality. I found this to be a fairly persistent issue.
Zoom. The camera’s zoom function still works with the lens attached, but in many cases it probably doesn’t make much sense to use it because unless you need the very wide perspective that the fisheye lens gives, you’ll get better quality without the lens attached.
- Magnification: 0.74x
- Weight: 4.4 ounces / 125 grams
- Depth: 1.1 inches / 27.2mm
- Outer Diameter: 2.6 inches / ø65
- Waterproof Rating: IPX8 (20 m / 65.6 feet of water for 60 mins according to Olympus in-house testing)
- Dustproof Rating: IP6X (Olympus in-house testing)
Price & Availability
Since I originally wrote this, OM System has released the Olympus TG-6. It was only a minor upgrade, and many of the features, specs, and performance remain unchanged. Both are great cameras.
- Improved light distribution makes your subject stand out
- Perfect for capturing moving subjects up close and for shooting underwater macro
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