A split shot puts two worlds in one frame: a reef or a swimmer below the waterline and the sky, a boat or a coastline above it. On a phone housing, that shot depends on a dome lens, and with the SeaTouch 6 Pro DIVEVOLK changed how its dome attaches, what it covers and how it handles water in the gap between dome and housing.
The short version: the second-generation Dome Lens seats in a slot built into the housing, its larger window covers both the main and ultra-wide cameras, and a one-click AquaLock holds the water between dome and housing steady. Below is what each change means for over-under photos, and what still depends on you. DIVEVOLK has not published matched frames from the old and new domes, so the effects described here follow from how the parts are built rather than from a measured comparison.
What a Split-Shot Dome Does
Hold a phone housing half underwater without a dome and the waterline runs right across the flat lens window. The result is usually a smeared band of moving water rather than a clean line. A dome puts a large curved window well in front of the camera, so the surface meets the dome well in front of the lens and the line across the frame stays broad and readable.
The curve also changes how the underwater half reaches the camera. A peer-reviewed study of hemispherical dome ports describes how a dome forms a virtual image that the camera focuses on, and how the camera's position relative to the dome's center affects distortion and color fringing. The study looked at a scientific camera rather than a phone, but the principle carries over: where the dome sits relative to the phone's lens matters. That position is what DIVEVOLK redesigned.
The technique side of split shots, from installation to composition, is in our earlier guide to over-under photography with the DIVEVOLK dome port. This piece covers only what changed.
What Changed With the Second-Generation Dome Lens
The first-generation dome described in that guide was designed for the SeaTouch 4 Max series. It clipped onto the front of the housing with a built-in buckle, had an arrow to line up with the housing's opening direction, and used a water separation ring to stop water moving between the dome and the housing from blurring the shot. The table below draws on the SeaTouch 6 Pro launch announcement and the generation table in our SeaTouch 6 Pro vs. SeaTouch 4 Max Plus comparison, which lists the earlier dome as covering one phone camera:
| Feature | First-generation dome (SeaTouch 4 Max series) | Second-generation Dome Lens (SeaTouch 6 Pro) |
|---|---|---|
| Mounting | External buckle mount, aligned by an arrow indicator | Fits the housing's integrated dome port slot directly, with no extra adapter |
| Camera coverage | Smaller window covering one phone camera | Larger window that covers the main and ultra-wide cameras at once |
| Switching phone cameras | Moving to a camera outside the window meant moving the dome | Switch between main and ultra-wide without repositioning the dome |
| Gap between dome and housing glass | Water separation ring | AquaLock structure, set with one click, holds a steady waterline between dome and glass |
Material, dome diameter, coatings and optical figures for the new lens have not been published, so they are not compared here. DIVEVOLK also does not say the window clears a telephoto camera, so plan split shots around the main and ultra-wide.
How Each Change Shows Up in Your Photos
The Ultra-Wide Camera Works Behind the Dome
Most split-shot photographers will notice this first. An over-under frame has to hold a subject below the water and enough sky or shoreline above it to tell the story, so the ultra-wide is usually the lens you want. With both cameras behind the window, you can shoot reef and sky on the ultra-wide, then tap over to the main camera for a tighter frame on a swimmer or a turtle without touching the dome.
That matters on moving subjects. Any pause to shift a dome tends to be the moment the animal turns away or a wave lifts the rig. Camera layouts differ between phones, so check yours on land: attach the dome, open the ultra-wide and look at the corners of the frame.
The Integrated Slot Fixes the Dome's Position
Because the dome now seats in a slot built into the housing, the housing sets its position relative to the phone's cameras; how carefully you lined it up that morning no longer enters into it. Given what the dome study says about alignment, a repeatable position should give more consistent results from one session to the next. There is also no adapter to pack or drop off a boat.
AquaLock Keeps the Second Waterline Still
There are two places water can sit in a split-shot rig: outside the dome, where the waterline you compose with belongs, and in the gap between the dome and the housing glass. If water moves in that inner gap, it can add a second, softer line or a smear across the frame. The AquaLock structure sets with one click and holds a steady waterline in that gap, so the only line moving in your frame should be the real surface.
What the Upgrade Does Not Change
Most failed split shots fail for reasons a dome cannot solve. These still decide the result:
- Surface conditions. Flat, clear water makes the shot. Chop and swell throw the line around, and the best you can do is time the frame between waves.
- The exposure gap. The sky is far brighter than the water below it. Shooting with the sun high or behind you, and keeping the underwater subject shallow and close, narrows that gap. Water also absorbs red quickly, which is one more reason the lower half often looks darker and bluer.
- Droplets on the top half. A single drop on the upper dome can ruin the sky. Keep the dome wet, or wipe it clean, before each attempt.
- Practice. Holding a rig half-submerged and level takes repetition, and the new dome does not shorten that.
Divers Alert Network's split-shot tips cover these conditions in more depth.
Split shots also come with a temptation that has nothing to do with gear. They are easiest in shallow water, and shallow water is where people stand on reef flats or seagrass to steady the frame. Do not. Float, keep your fins up and off the bottom, and give animals room. NOAA Fisheries' marine life viewing guidelines are a good baseline. At the surface, stay visible to boat traffic and close to your group, because a photographer looking at a screen is not watching for a hull.
Compatibility
The second-generation Dome Lens is built around the SeaTouch 6 Pro's integrated slot. DIVEVOLK's launch material does not say whether it fits the SeaTouch 4 Max series, or whether a first-generation dome can be used on the SeaTouch 6 Pro. If you own one housing and are thinking about the other dome, ask technical support before you buy.
On the phone side, the SeaTouch 6 Pro housing takes phones up to 180.0 × 82.5 × 11.2 mm and no more than 17 mm thick at the camera module. DIVEVOLK states that the dome window covers the main and ultra-wide cameras, but camera layouts vary, so check your exact model against the compatibility list.
Pricing and availability are on the SeaTouch 6 Pro Dome Lens page, other optics are in lenses and filters, and our SeaTouch 6 Pro kit buying guide shows where a dome fits among the other accessories.
Who Benefits Most
Regular split-shot photographers on the SeaTouch 6 Pro. Snorkelers, freedivers, surfers and anyone shooting at the waterline will get the most from the ultra-wide coverage and the fixed slot.
SeaTouch 4 Max owners who are happy with their dome. The dome alone is a weak reason to change housings. The SeaTouch 6 Pro vs. SeaTouch 4 Max Plus comparison weighs it against the other changes, such as the larger phone envelope, the restored swipe-up and the desiccant slot.
Divers who have never shot a split. Start with the snorkeling red filter that ships with the SeaTouch 6 Pro, which covers 0 to 10 meters, and add the dome once you know you want the waterline in your pictures. Family snorkeling days in calm, shallow water are an easy place to try, and our guide to family snorkeling with the SeaTouch 6 Pro covers how to keep those sessions safe.
Before Your First Split-Shot Session
Do this once on land. Seat the dome in the slot and set the AquaLock until it clicks. Open the ultra-wide and check the corners of the frame, then switch to the main camera and confirm nothing in the view moved. Wipe the outer dome, and plan the first attempt for calm water with the sun high or behind you. The new mount takes care of alignment, so most of what is left is timing the waves.
