Inon UCL-G165 SD Underwater Wide Close-up Lens

Inon UCL-G165 SD Underwater Wide Close-up Lens

Regular price $445.00
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UCL-G165 SD Underwater Wide Close-up Lens

The INON "UCL-G165 SD" underwater wide close-up lens enables you to shoot a subject from close range of the lens to capture the subject larger in a frame.

Compatible camera

    • SONY FDR-X3000/X3000R
    • SONY HDR-AS300/AS300R
    • GoPro® HERO10 Black
    • GoPro® HERO9 Black
    • GoPro® HERO8 Black
    • GoPro® HERO7 Black
    • GoPro® HERO6 Black
    • GoPro® HERO5 Black
    • GoPro® HERO+LCD
    • GoPro® HERO+
    • GoPro® HERO
    • GoPro® HERO4
    • GoPro® HERO3+
    • GoPro® HERO3

Get Closer Minimum Focus Distance

An action camera is a deep focus camera which does not require focusing but prevents a subject gets in focus in close range (within 60cm/2ft range in theory for GoPro® camera) thus not usable for underwater macro shooting. Using standard macro lens for a compact digital camera would not help the situation as it would create vignetting and very shallow depth of field preventing comfortable focusing. The UCL-G165 SD lens is so-called "wide close-up lens" specifically designed for action cameras based on their optical characteristic. The depth of field (DoF) underwater will be 5cm/2.0in to 35cm/1.1ft when using the lens for GoPro® HERO10 Black supporting closer minimum focus distance underwater to capture wow photos/clips.

* The depth of field (DoF) on land is theoretical value based on focal length/aperture of camera lens and pixel pitch of the image sensor. DoF underwater is measured from "the forefront of the lens".

Ideal Angle of View for Macro Shooting

Maximum angle of view of GoPro® HERO10 Black Black is approx. 151° on land which will narrow down to approx. 94° when the camera is housed in genuine dive housing and submerged due to different refraction index. The INON UCL-G165 SD slightly increases angle of view underwater to 110° to capture dynamic scene played by a subject as the lens frames subject larger than UFL-G140 SD which delivers ultra wide 140°.

※Measured angle of view by INON on land or calculated angle of view underwater based on the measured angle of view on land. Not confirmed by camera manufacture. The measured angle of view of "HERO3+ Silver Edition" is approx. 142°(air) which is less wide than the "Black Edition". So angle of view underwater with this lens is less than 110°. The "HERO3+ White Edition" has not been tested.

Professional-level Image Quality

Optics is constructed of 2 elements in 2 groups. All elements are made from high refractive index glass lens to minimize whole size dramatically without sacrificing performance. Both lens elements have anti-reflection coating on all surfaces to elicit combined master lens performance with less ghost/flare.

Speedy Lens Exchange by SD Mount

Bayonet INON SD Mount compatible to support friendly and speedy lens exchange underwater. Compatible with AD Lens Holder to hold a lens when not in use.


Size 77mm / 3.0in (Diameter), 25.2mm / 1.0in (Length)
Weight [air] 200g / 7.1oz
[underwater] approx. 121g / 4.3oz
Mount system INON SD Mount
Depth rating 60m / 196.9ft
Body material/finishing Corrosion-resistant aluminum alloy / rigid black alumite, PC etc.
Lens material/coating Optical glass / both side coating
Lens construction 2 groups 2 elements
Max. view angle (*1) 165mm (underwater)


(*1) Standalone focal length of UCL-G165 SD and not combined focal length with camera’s master lens. 


Mfr.   Camera Depth of field with UCL-G165 SD (*2)
GoPro (*3) HERO10 Black
HERO9 Black
HERO8 Black
HERO7 Black
HERO6 Black
HERO5 Black
HERO3+ Black
5cm / 2.0in to 35cm / 1.1ft
HERO3 BLACK 7cm / 2.8in to ∞
OLYMPUS TG-Tracker 2cm / 0.8in to 15cm / 5.9in
5cm / 2.0in to 35cm / 1.1ft


(*2) Measured DoF from foreground of the lens surface. Divide by 1.33 for visual distance underwater.。
(*3) Measured distance underwater for GoPro® HERO10 Black/HERO9 Black/HERO8 Black/HERO7 Black/HERO6 Black/HERO5 Black/HERO4/HERO3+ Black/HERO3 Black/HERO/HERO+/HERO+ LCD. Other Edition has not been tested.

[When using the UCL-G165 SD]
* The UCL-G165 SD is designed only for underwater use. Using the lens on land will have vignetting.
[When using for GoPro®]
* Always set camera's Field of View (FOV) to [WIDE]/[Ultra Wide]. Using [Medium] or [Narrow] won't bring optimal performance of this lens.
* Not usable for [SuperView™] as this mode adds software-based deformation effect resulting from processing original 4:3 aspect ratio to 16:9 enhancing more aberrations when using an attachment lens. It would not recommendable to use [SuperView™] when using the UCL-G165 SD lens.
* Since this lens provides ultra wide angle of view, it is recommended to set Spot Meter to [ON] when using external lighting source (LED flashlight etc.). Setting Spot Meter to [OFF] may have washout if the external lighting device aims center of the frame.
[When using for TG-Tracker]
* Activate image stabilization function of the camera while shooting video to avoid vignetting. When taking still images, do not use attachment lens to avoid significant vignetting on image corners.
* Since the camera is designed to offer optimal focusing performance for close range subject, usable range of DoF (depth of field) with this lens is "2cm/0.8in to 15cm/5.9in" and distant subject beyond this range gets blur.
[When using for FDR-X3000/HDR-AS300]
* Select SteadyShot (Movie) [Act] when shooting video as [Std] and [OFF] cause slight vignetting. Select SteadyShot (Still) [ON] when shooting still image. Excessive camera movement may result vignetting even SteadyShot (Movie) [Act] is selected.
* Always set camera's angle setting to [W:Wide]. Using [M:Medium] or [N:Narrow] won't bring optimal performance of this lens.

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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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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