Nauticam NA-503-H Housing for SmallHD 503 UltraBright On-Camera Monitor (With HDMI 1.4 input) - 17925

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The SmallHD 503 UltraBright monitor is an incredibly compact and sharp 5-inch daylight viewable field monitor and the perfect complement to a Nauticam underwater video system. The UltraBright version adds 2200 nit daylight viewable brightness to the already stunning 5″, 1920 x 1080 Full HD Display. The 443 PPI monitor comes equipped with an amazing suite of software tools for image monitoring in a compact form factor. This version of the NA-503-H is setup for an HDMI camera connection, see NA-503-S for an HD-SDI camera connection.

Technical Specifications

Depth Rating 100m
Weight in Air 1.9kg
Buoyancy in water positive 0.39kg
Dimensions 252mm (W) × 139mm (H) × 111mm (D)

Introducing NA-503-H

The SmallHD 503 UltraBright Monitor

There aren’t enough good things that can be said about this screen. Pixel density (the specification that results in sharpness) now sits at 443 PPI (higher than an iPhone 11). The monitor is capable of displaying 100% of the REC 709 color space allowing for accurate judgement of color and exposure even in bright daylight conditions.

The monitor feels immediately familiar, almost identical in size to your favorite smart phone. A joystick is used to effortlessly flip through video “pages”. Each page accepts multiple imagine analysis tools, configured by the user for their individual needs.

Exposure Tools

Exposure Assist (False Color)

This overlay mode "paints" areas of the image that have reached a certain brightness value allowing the shooter to see what parts of the image may be over or underexposed. The colors used to show these luminance values can be customized as well.


A slightly simpler version of the Exposure Assistant this tool "paints" areas of the image with a stripe pattern when they reach a pre-set brightness value allowing you to quickly see areas that may be in danger of being over or under-exposed. You can run two zebra overlays at once allowing you to monitor both highlights and shadows simultaneously. This tool does not change the underlying color of the image on the display making it a less obtrusive option than False Color overlays.


The waveform shows you the brightness of the image as a map, matching the screen from left to right. This tool can also be set to RGB mode in which case it monitors Chrominance (Color) as well as Luminance (Brightness). The RGB and RGB Parade modes will also help judge color balance (i.e. white balance), especially useful to underwater shooters.

RGB Parade (Histogram)

This tool shows an RGB Luminance Histogram that allows for easy judgement of each channel and the overall image's exposure.

Focus Tools

Pixel Zoom

Zoom in on any page by simply pushing the joystick up. This allows for accurate judgement of critical focus.

Focus Assist

This mode highlights the sharpest areas of the image with an assignable color. This allows for quick an accurate judgement of focus without having to zoom into the image.


This is a more subtle version of Focus Assist that does not change the underlying image as much yet still shows the outline of the sharpest parts of the image in an assignable color.

Nauticam NA-503-H Underwater Housing

Nauticam has supported the 501, 502, and 502 Bright models of SmallHD monitors and continue to evolve and innovate with the new NA-503 for the 503 UltraBright Monitor. With more cameras offering video capability the need for an efficient and bright external monitor is only growing. With Nauticam's bulkhead system, attaching and detaching the cable system can be done quickly in the field. This means you can easily switch from a still photo setup to a video setup in between dives, quickly removing the monitor and even installing a magnifying viewfinder to the housing.

The NA-503 housing provides access to all monitor controls, and the complete menu system is available in the housing, and at depth.

The Nauticam NA-503 housing features the rugged build quality and advanced manufacturing expertise our user base has come to expect. The joystick navigation system used by the 503 UltraBright monitor is translated to four directional arrows, a center select button, dedicated “back/power" button, along with the "F1" and "F2" buttons underneath. The interface is simple, but elegant, and perfectly suited to the underwater environment.

The SmallHD 503 UltraBright does require the addition of the SmallHD L-Series Battery Plate for 503/703 UltraBright. The Nauticam NA-503 housing accepts up to two Sony NP-F750 batteries which provides up to 4.5 hours of run time.

HDMI and HD-SDI are both supported by a single housing, providing an extremely broad range of camera support in a single underwater monitor system.

Cross Conversion and Passthrough

The 503 UltraBright monitor can also function as a passthrough monitor, passing either HDMI or SDI to a surface monitor. The NA-503 housings feature a M28 opening that can accommodate another HD-SDI or HDMI cable.

The SmallHD 503 UltraBright also features a cross-conversion feature meaning an HDMI input from the camera can be converted to an HD-SDI signal by the monitor and passed through a second bulkhead to a surface monitor. HD-SDI can travel over longer distances making this ideal for surface monitoring even from a camera that only features HDMI output. Nauticam HD-SDI Cable Accessories provide a reliable way of transporting a video signal over long distances.

Accessory Ports

  • 1 x M16 pre-installed with 25625 Vacuum Valve II
  • 1x M28 pre-installed with M28 to M16 Step Down Adapter


NA-503 System Chart PDF Download

What's In The Box:

  • 17925 NA-503-H Housing with HDMI 1.4 Input
  • 90254 Spare Housing O-Ring and Lubricant
  • 25071 HDMI 1.4 cable (A-D) in 0.75m length (pre-installed)
  • 25625 M16 Vacuum Valve II (Pushbutton Release)
  • Mounting Ball (pre-installed) and Monitor Hood
  • 25033 Standard HDMI bulkhead with M16 thread
  • 25036 HDMI (D-C) cable in 190mm length (for connection from HDMI bulkhead to camera)
  • 25046 HDMI (D-D) cable in 200mm length (for connection from HDMI bulkhead to camera)
  • M16 extension
  • CR2032 Battery
  • Allen Wrench Set
  • Padded Travel Bag

NA-503-H Optional Accessories

  • 25071 HDMI cable (A-D) in 0.75m length (for connection from Shogun housing to HDMI bulkhead) Compatible with 17904/17909/17908/17923/17925
  • 25036 HDMI (D-C) cable in 190mm length for NA-D6/D5/D500/5DIV/5DSR/R.
  • 25042 HDMI (D-C) cable in 240mm length for NA-1DXIII/D850/Z7II/Z7V.
  • 25046 HDMI (D-D) cable in 200mm length for RX100V/VII/VII/G7XIII/G5XII/a6500/A7RIII/a2020/Z50/EM1X.
  • 25075 HDMI (D-A) Cable in 190mm Length for NA-GH5S.
  • 25076 HDMI (D-D) Cable in 200mm Length for NA-XT4/XT3/A6400/6600/R5/R6/GFX100/GFX100S/A7C.
  • 25083 HDMI (D-A) Cable in 240mm Length for NA-BMPCCII/6K/S1R/S1H.
  • 25095 HDMI (D-A) Cable in 170 mm Length for NA-A7SIII.
  • 25100 HDMI (D-A) cable in 200mm length for NA-a1/FX3.
  • 25701 HDMI (D-A) cable in 260mm length for NA-C70
  • 16243 HDMI A-D Cable in 0.5m Length for RED DSMC2/C200/EVA1/C500II/E2/E2F.
  • 90254 Spare Housing O-Ring

SDI Out Connectivity:

  • *25058 M16 SDI Bulkhead
  • *25060 SDI cable in 0.3m length (for connection from camera to underside of SDI Bulkhead)
  • *25065 SDI surface monitor cable in 45m length (for connection from SDI Bulkhead to Surface Monitor on land)
  • 25059 SDI cable extension adaptor
  • 25062 SDI cable in 5m length (for connection between SDI Bulkheads)
  • 25063 SDI cable in 30m length (for connection between SDI Bulkheads)
  • 25064 SDI surface monitor cable in 15m length (for connection from SDI Bulkhead to Surface Monitor on land)

(* items are essential items to use a surface monitor)

Optional Monitor Mounting System:
  • 17951 Nauticam Monitor Housing Mounting System Compatible with 17904/17905/17909/17909N/17910/17925/17925S, and 17922S from SN A158538 onwards.
  • 17952 Nauticam Monitor Housing Mounting Adaptor to use with NA-A7S/A7II/A9/A7RIII/A7RIV/α2020/A7SIII/α1/XT3/XT4/Z50.
  • 17953 Nauticam Monitor Housing Mounting Adaptor to use with NA-GH4/GH5S/V/GH6
  • 17954 Universal Tripod Plate for Nauticam Housings (excl. cinema housings)
  • 17955 Mounting ball to use with NA-Shogun/ Flame/RT7/Ninja V-S/503 Monitor
  • 17957 Nauticam Monitor Housing Mounting Adaptor to use with NA-NA-S1R/S1H/BMPCCII/6K/Z7/Z7V/Z7II/1DXII/5DIV/6DII/1DXIII//R5/R6/D6/780/GFX100S/C70
  • 17958 Mounting Ball for NA-502/502B/503/ Ninja V/ Ninja V-S/Shinobi/RT4.7/FHD5/058
  • 16226 Mounting Bracket for Monitor Housing to use with Cinema Housings compatible with 17904/17905/17909/17909N/17910/17922S/17925/17925S.

April/May 2022 Delays:

Due to further Omicron outbreaks in China, some products may be delayed. Not all brands or products will be affected by this. As some products are kept in stock as a matter of course, these should not be affected.

If you need things urgently please contact us and check ETA on the items you require.

International Shipping

At the moment, our website is only set up to ship within New Zealand. If you live outside New Zealand, please contact us and tell us your full shipping address and what you want to purchase. Please note that our free shipping offer applies to NZ shipping only. Our preferred method of shipping internationally is DHL.

How long will it take for my order to arrive after I make payment?

That depends on where you live and whether we have an item in stock or not. While we do have many items in stock, we don't carry everything. If you need an item in a hurry, it's a good idea to contact us and find out if your item is in stock.

If we have it in stock, we can usually send it out as soon as we receive payment, or you can pick it up. If an item is not in stock, we'll need to order it from our suppliers, which means it can take 1-2 weeks to arrive at your door (usually closer to a week).

Sometimes delivery can take longer, if our manufacturers are out of stock, for example, but this is unusual - we let customers know as soon as possible if something like this happens.

How do you ship my NZ orders?

We use New Zealand Post and CourierPost to ship orders. Our default is courier, though you may organise an alternative with us by contacting us directly. CourierPost aims for next day delivery nationwide between major towns and cities in the North Island. South Island delivery can take two days. If you require next-day delivery in South Island, choose the express shipping option for the South Island. If you spend over $250 get your shipping for free!


We hope you, your families and friends are safe and healthy during the current Covid-19 situation.

As you may know we are a small team at Sea Tech Ltd. Our team has zero close contact with people outside our bubble.

We wish to assure you we are following the government health guidelines surrounding safe operating procedures. Hygiene basics such as hand washing, coughing/sneezing protocols as well as the wearing of appropriate protective equipment such as face masks.

We are continuing to follow the regular updates to government health guidelines and initiatives regarding Covid-19.

Please do not hesitate to contact us if you wish to discuss any aspect of our delivery service via Courier Post New Zealand.

We wish you all the best during these challenging times.

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If you buy something from an overseas supplier, that is most definitely not the case. While the product might seem like a great deal on screen, it's important to understand customs and import costs.

In addition to the ticket price on an overseas purchase, whatever the exchange rate is on the day (this can fluctuate wildly - trust us, we know), there are also tariffs, GST and border processing fees. This can easily add upwards of 25% to the ticket price. Items costing over NZ$1000 also incur import entry transaction fees.

In addition to these extra costs, Customs clearance can also cause delays. Sea Tech has been importing for years - we've got this down to a fine art, and we've built relationships with customs that help our items clear quickly.

By buying from Sea Tech, you avoid all the headaches, delays and extra costs. We handle all this stuff for you, so you don't even have to think about it.

Want to know more?

These Nauticam housings are non-returnable, non-refundable, non-cancellable, and may be subject to extended lead times as they are manufactured on demand. We always do our best to meet trip deadlines so please advise us if you have a trip coming up!

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Sea Tech has built its reputation and business on knowing our stuff, giving you the best, whether that's advice or products, and helping out when you need a hand. Underwater photography can be tricky and expensive, so it's best to buy local and buy official.

Why Choose Sea Tech

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