Sony DSC-RX100M4

Sony DSC-RX100M4


Our most careful purchase, and most costly to date, has been the Sony DSC-RX100M4. Fed up with the poor performance of the Nikon Coolpix AW130, we decided it was time to be a bit more professional. After a lot of soul-searching, we settled on the Sony and its Nauticam NA-RX100IV marine housing.

Long story short: this camera has completely changed our approach toward underwater photography. When I look back on our years of using point-and-click cameras (no aperture control, no RAW export), I cringe for the loss of so many high-quality photograph opportunities!

Sony Free diving gear for St Elmo’s Bay, Malta: fins, weights, mask, and camera.

When we dive with others, I’m always surprised at how small the camera is compared to fixed-lens counterparts. And with similar quality!

We’ve been using the Sony since arriving in Malta (winter, 2016) for all of our dives. Given that the conditions here (in winter) are quite poor to begin with, we’ve been pleasantly surprised at how well it operates in low-light conditions even in “auto” mode.

In Malta, dives are mostly fairly low-light and with a good bit of sediment in the water. I shoot most photographs in aperture mode or programme mode, both of which allow me to force open the aperture, which in turns increases shutter speed. Recently I’ve started using manual mode, but it’s a learning effort in progress.

Geared up Notice the camera housing (wide-angle lens, strobe) attached to the top-right d-ring.

Rigorously clean your camera housing after every dive. It’s the most expensive part of your kit! Running it under warm water, click on every button a few times to discharge any built up salts. Dry it off—make sure that the lens isn’t wet if you’re air-drying, as it will water stain. We take out the o-rings when the housing won’t be in use for a while, but otherwise leave them on.

When taking the camera out of the housing after diving, I carefully dry around the “opening” part, then open it upside-down so that water won’t drip into the housing itself.

Sony All (most?) of our still-photo camera gear to date.

Lastly, if your Nauticam housing starts to blink red when you start it up, just change the battery.


The Sony lacks a GPS and (obviously) depth metre, which is unfortunate. It’s also very expensive.

(If you’re not looking to do video work, I’ve heard that the A6000 is a much cheaper version with the same non-video technology.)

I long bemoaned that it doesn’t have a white-balance setting for underwater, but since moving to RAW editing all files, this isn’t so much of an issue.


The marine casing makes it easy to use programme mode and adjust shutter speed whilst diving. All of the buttons and knobs of the camera are available on the casing. And still work after all these years!

I haven’t tried other marine casings for this camera, but after several years of diving with it, no buttons are stuck, no floodings, and everything works like a charm.


We have the vacuum pump accessory to the camera, which I consider of questionable utility, but is now part of our “process” of preparing the camera for diving.

We starting with purchasing a wet correctional dome port lens fitted to the Nauticam housing (67 mm): the Meikon wet dome port lens. This lightweight lens corrects for the refraction of water. We since also acquired the AOI UWL-09 wide-angle lens. This fabulous piece of machinery is what we usually use in our photographs.

We have a SEA&SEA YS-01 strobe on a tray. This, like the UWL-09, has required us to pay a lot more attention to the finer techniques of photography.

Lastly, we use a bayonet mounting system. For the Nauticam, this consists of the Bayonet Female screwed into the lens port. This is a fabulous creation on the part of AOI/Fantasea—and one we’ve been waiting for. (The Nauticam has a bayonet mounting system, but we don’t use the Nauticam lens.)

Geared up Female mount (screwed into lens port on left) and male wide-angle mount (right).

With the bayonet mount, removing the wide-angle lens is a button-click and twist. Adding it is the same. This makes the process of “cleaning” the lens (getting rid of bubbles between the lens and housing) trivial. It also makes it easy to remove the wide-angle if coming suddenly across macro-style subjects.

The bayonet mount does add a little negative buoyancy, however. And it doesn’t work for non-UWL-09 lenses; so when diving with our Meikon correctional dome, the mount needs to be removed. (Which is also pretty easy.)

For information on the mounting system for the lens, see our AOI UWL-09 article.