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Description
3.97mm f/2.8 82d HFOV 16MP (No Distortion)(Visible - IRCUT)The 3. 97mm is a superb 4K lens designed for the GoPro HERO 4 3+ 3 camera line, it will not work in GoProHERO 7 6 5 cameras. With its 16MP sharp 8 glass non fisheye optics this lens captures the GoPro HERO 4, Hero 3+ and Hero 3 model's 12MP photos and up to 4k (8. 4MP) video. After removing the stock lens the 3. 97mm threads in easily. No need to change to a different lens mount and all GoPro accessories that mount around the plastic black lens
The 3.97mm is a superb 4K lens designed for the GoPro® HERO® 4/3+/3 camera line, it will not work in GoPro®HERO® 7/6/5 cameras. With its 16MP sharp 8 glass non-fisheye optics this lens captures the GoPro® HERO® 4, Hero 3+ and Hero 3 model's 12MP photos and up to 4k (8.4MP) video.
After removing the stock lens the 3.97mm threads in easily. No need to change to a different lens mount and all GoPro® accessories that mount around the plastic black lens surround are supported. No gap is present between the lens and the black GoPro® lens surround as the 3.97mm lens spans the entire cavity.
No fisheye/barrel distortion means objects are naturally straight and just as your eyes see the world. Mounting to a UAV? You'll be glad to know that's exactly where we mounted this lens the most as we were tweaking its production. See the videos below for examples mounted to the 3DR SOLO.
With the same f-stop as the stock lens the GoPro® software will never know the lens has been changed. Light levels will be handled as normal and depth of field will be very similar.
With it being over 40 degrees narrower than the stock GoPro® lens and 8 degrees narrower than the DJI Inspire and Phantom 3 cameras, this lens brings your subjects closer without being too zoomed in to introduce unwanted image jitter.
If you've thought of changing the lens on your camera but were never happy with the way the lenses on the market handled lens flare, you'll be glad to know that was a major concern of ours during development. We went through many iterations to reduce any "bad", concentrated flare spots and left only minimal cinematic flare. See the "Sunset at Scripps Pier" video below for an example.
| When you change the lens on the GoPro® HERO® cameras we recommend having us remove the stock lens profile software so the colors are natural (and not tinted pink around the edges). All example media shown has this lens profile removed from the camera. |
| Don't want to worry about sending you camera in to be modified? We sell new cameras with this lens installed HERE. |
| Model Number | GP39728 |
| Focal Length | 3.97mm |
| 35mm Equivalent | 22.63mm |
| Fish-eye Distortion | NO |
| Black Vignetting | NO |
| Weight (Stock Lens = 5.5g) | 7.18g |
| Angle of View (V*H*D) | 65 x 82 x 92 degrees |
| Aperture (f Stop) | 2.8 |
| Back Focal Length (BFL) | 4.65mm |
| Dimensions (Diameter x Length) | 17.40 x 22.48mm |
| Native Camera Sensor Support | 1/2.3" |
| Native Megapixel Support | 16MP |
| Thread Material | Metal |
| Optics Material | Glass |
| Fits in GoPro Waterproof Case? | Yes (Pressure on Lens Will Cause it to Shift Focus, So Use Extended Backdoor) |
| Case Mod Needed? | No (But Puts Less Pressure on Lens) |
| Dust Ring Included? | Yes (DR_A + DR_B) |
Works With These Cameras:
Example 3.97mm Media:
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 30 reviews
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Product Reviews
★★★★★ 5
Comprar la correa
Color: Gold, Color: Gold
Me compré este reloj mido commander pero se me quebró la correa metálica dorada donde la puedo comprar se quebró donde va el perno de la tapa gracias por su información
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Reviewed in the United States on August 17, 2025
★★★★★ 5
Piece of art
Color: Anthracite
Excellent watch. Movement is Swiss not Japanese as stated. Minimalistic design, officially certified chronometer, good everyday runner for any occasion.
Warmly recommended buy.
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Reviewed in the United States on March 10, 2021
★★★★★ 5
AAA
Color: Anthracite
Calidad insuperable, 10/10
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Reviewed in the United States on May 1, 2023
★★★★★ 5
Great, comfortable jeans.
Special Size: Low Stretch, Size: 34W x 30L, Color: Dark Midnight Wash
Great jeans! They're relaxed, but not loose or super baggy, so they still look great. I got the dark wash and you can wear them as dressy jeans or just casual out and about. I have bigger thighs and the 34x30 fits perfectly with room still to spare and not constricting at all. Whether it's walking around a lot, or sitting down for hours, it's very comfortable.
We'll see how long they last but I washed them once already and are holding up.
The length is good as well. When I don't have shoes I probably need a belt or could've ordered 29 length, but they're fine when I have shoes on. They don't slip down at all.
Especially for the price compared to Levi's or others that cost 40, 50, or even $60 this is a great deal.
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Reviewed in the United States on November 12, 2025
★★★★★ 5
If you’re on the fence read this
Special Size: Low Stretch, Size: 40W x 30L, Color: Iced Light Wash, Special Size: Low Stretch, Size: 40W x 30L, Color: Iced Light Wash
In all honesty, I was skeptical about ordering jeans from Amazon. I’ve always bought my jeans in stores, but I figured I’d give it a shot. I ordered these jeans for an upcoming outdoor wedding because I wanted something lighter and thinner. They showed up today, and I threw them on. They fit great, feel good and comfortable, and they don’t look cheap. I’ll mainly be using these for outings, so I can’t really attest to the durability as far as working in them, but I’d still suggest them. For reference, I’m 5’8” and 230 lbs with a husky build—kind of fit, kind of fat.
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Reviewed in the United States on March 12, 2026