Review: Nauticam MWL-1 Conversion Lens by Jack Connick

Review: Nauticam MWL-1 Conversion Lens

By Jack Connick, Ocean Optical Sales

Nauticam’s innovative new MWL-1 is a game-changing wet mount wide angle lens. Designed to be used in front of a housed macro lens, it allows for an approximate 150° field of view with excellent sharpness and quality. Using a specialized double lens flip holder, you can now switch to three lens lengths; shooting close-up macro with a diopter, shooting standard macro with the 60mm lens or a moderate fish portrait type shots), or a wide angle lens with a 150º field of view.

The lens is compatible with FX and some APS-C DSLRs, Mirrorless, Compact, MFT, 1” sensor compacts (see lens chart). Nauticam is actively testing and adding more compatibility information. The MWL-1 allows for focusing from infinity to the front element, so it’s quite good for close focus wide angle (CFWA) shots. The ability to shoot wide angle and macro on the same dive is now a reality, even for full-frame DSLR systems!

I took one of these new Nauticam MWL-1 lenses for my Nauticam NA-D850 housing rig with me on our recent Optical Ocean Sales Forgotten Islands Photo Expedition to Indonesia, and I’m very impressed with the results. 
###MWL Lens: The lens comes in a zipped and padded soft case and includes the Nauticam bayonet attachment, including male and female parts. The MWL is fairly small with an integrated lens hood. The hood can be rotated as necessary for alignment. As the optics are high-quality glass, the lens isn’t light and weighs 2.6 pounds (1.2 kg) out of the water and about 1.25 pounds (0.6 kg) underwater. A small flat port for the required camera lens is all that’s needed to add it to your rig. No extensions, zoom gears or other parts are necessary.

This is the real hidden beauty of the MWL, its small size for travel and diving. It can replace a large 9” glass dome port, 90 mm extension, zoom gear, and large camera lens! This makes traveling with a large FX underwater rig much easier.


The lens couples with a macro lens, in the case of the Nikon FX cameras, the Nikon AF-S DX Micro NIKKOR 60mm f/2.8G macro lens. The MWL along with a flip mount and a diopter is fairly heavy, so is a bit of a challenge to get neutral. On my NA-D850 (with lighting) I added about 5 pounds (2.25 kg) of flotation and it became more reasonable to work with if still a little negative. There is not a flotation collar available for it yet, but a Stix float belt worked pretty well.


I had some lenses at my disposal for the trip; my favorite Sigma 15mm FE, Nikon 16-35mm, a borrowed Nikon 8-15mm FE, and the new MWL. For macro, I had the standard FX 105mm VR lens and the AF-S 60mm macro to couple with the MWL. I mostly used a SagaDive +10 diopter with the 60mm as I like its small size and power.

The MWL handles well in the water, and the coverage is quite wide at about 150° (depending on the camera and lens used with it). It does get a little long and a bit bulky with the added flip holder, floats, diopter, etc. but it’s easy to get used to, and it certainly is no bulkier than a large domed lens. Having a little longer port and lens meant that I could also move my strobes forward a bit. As it is a small dome lens, sun flare was easily controllable, if existent at all, and sunballs are fairly easy to shoot.

The new Nauticam flip holders explicitly designed for it must be used, as the older flip holders aren’t strong enough to handle its weight. They are a bit stiff, and I sometimes had to hold the rig against myself to flip the lens up or down.

It also focuses down onto its very small dome for CFWA. It’s easy to shoot big animals or flip over to a macro diopter for tiny subjects. This opens up a great opportunity to tell a story, creating a series of photos with different points of view.

The lens does need to be stopped down to get the best performance. Nauticam recommends f/16, and after some testing, I agree with that parameter. You could cheat it a bit to F/14, but the shots soften quickly with the high-resolution D850 below that.

Nikon D850, Nikon 60mm f/2.8, Nauticam MWL-1, 1/80@f/13, ISO1600
Full resolution image here.

Nikon D850, Nikon 60mm f/2.8, Nauticam MWL-1, 1/80@f/14, ISO1600
Full resolution image here.

Nikon D850, Nikon 60mm f/2.8, Nauticam MWL-1, 1/80@f/16, ISO1600
Full resolution image here.

Comparing it to the ubiquitous AF-S NIKKOR 16-35mm f/4G ED VR, the 16-35mm lens with the S&S focus diopter allows shots to be taken easily in the f/11-f/13 range. I find the NA-D850 to be well-balanced with a 9” glass dome and extension in the water, with only a small amount of floatation necessary. Split shots also work great with a large dome and the 16-35mm.

Macro close-up image of the salp in the image above, taken on the same dive!

I will still pack a fisheye lens such as the Sigma 15mm FE, or Nikon 8-15mm FE along with a small Nauticam 140mm dome port, as I still want that super wide lens in my arsenal.

DX Mode on an FX Camera for Macro:

A 46MP image allows for a lot of cropping, and the creamy dynamic range is great. But I’ve struggled a bit with depth of field using the Nikon 105mm VR lens. I’ve had to either approach my subjects from a flat angle, so that they weren’t foreshortened, or stop way down to f/29 (past normal diffraction sharpness settings) to get enough depth of field. I wasn’t always that happy with the resulting sharpness or the extremely shallow depth of field.

So I decided to put the D850 in DX mode and use it that way with a macro diopter wet lens. This got me back to a very comfortable, and sharp, f/14-f/16 aperture range on the lens with greater depth of field. It’s not just a cropped image; the optics of the cropped sensor allow for more depth of field at the cost of smaller image size.

While I don’t have a super large 46MP image, I do have a 26MP image with greater depth of field and sharpness, which I think is a good tradeoff. I like the larger viewfinder on the D850 in DX mode as you can see beyond the image edges for framing.

It’s a nice way to use the MWL lens setup and gives you another gear to shift for macro shots. You would n’t want to shoot the MWL lens in DX cropped mode as you would undo most of the benefit of the wide angle field of view.


The Nauticam MWL wide angle lens is a versatile and compact solution to the vexing problem of housing a mid-range lens without having to carry a large dome port. It shoots quite well, and opens opportunities for mixing your shots up “on-the-go.” While it’s not inexpensive at $1850, it uses the relatively inexpensive 60 mm macro lens and a port that many people already have. Adding up the cost of an expensive mid-range zoom lens, large glass dome port, extension, and gears, and it becomes a cost-effective and smaller solution that’s travel-friendly.

For a high-quality general purpose, mid-range lens solution, it might be something to consider for your underwater rig. See more shots taken with a variety of lenses with the D850 on my Forgotten Islands trip here.

About the Author

Jack Connick describes himself as an Adventurer, diver, sailor, photographer, writer and sometimes graphic designer and he is the owner of Ocean Optical Sales in Seattle. He has made over 1300 dives in 10 countries around the world and leads dive trips at least twice a year. To see more of his amazing images, please check out his gallery on Flickr.