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Description
3.97mm f/2.8 82d HFOV 16MP (No Distortion)(Blue 450nm)The 3. 97mm is our newest 4K lens designed for the GoPro HERO and DJI Phantom X3 camera lines. With its 16MP sharp 8 glass non fisheye optics this lens captures the entire image sensor. This model of the 3. 97mm lens has our Blue 450nm filter cemented to the back of it. The blue channel of the image will contain the Blue light. After removing the stock lens the 3. 97mm threads in easily. No need to change to a different lens mount and all GoPro and
The 3.97mm is our newest 4K lens designed for the GoPro® HERO® and DJI Phantom/X3 camera lines. With its 16MP sharp 8 glass non-fisheye optics this lens captures the entire image sensor.
This model of the 3.97mm lens has our Blue 450nm filter cemented to the back of it. The blue channel of the image will contain the Blue light.
After removing the stock lens the 3.97mm threads in easily. No need to change to a different lens mount and all GoPro® and DJI accessories that mount around the 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. On the DJI cameras a small gap will be created as the lens is not as large in diameter as the stock lens.
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 on the GoPro® and DJI cameras the capture 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 X3 and Phantom 4/3 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 | GP39728BLUE |
| 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) |
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
4.5 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Fun Toy for Active Dogs
My dog enjoyed playing with this toy and stayed entertained for a long time. It moves well and keeps pets curious and active. Easy to use and good quality for the price.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Durable Interactive Dog Toy with Bluetooth Sounds – Perfect for Dogs Who Love Cat-Style Toys
This interactive dog toy is surprisingly durable and very engaging, especially for dogs that love cat-style toys. My dog is obsessed with cat toys and also always wants to destroy something, so this toy is a perfect match. The Bluetooth sound feature makes it even more fun and interactive.
Pros
• Very durable main body made of hard plastic; my dog hasn’t been able to destroy it
• Great for dogs that like “mouser-style” toys
• Bluetooth feature lets you play animal sounds or music (I use Spotify dog playlists)
• Three different modes and very easy to switch
• Interactive and mentally stimulating
• Comes with two replaceable ropes, which I’m really happy about
Cons
• The ropes don’t last long for strong chewers
• The top part where the rope is attached can be chewed
Overall
Honestly, if there weren’t any parts my dog could destroy, he probably wouldn’t find the toy interesting. That’s why I’m actually happy it comes with two ropes that I can attach and replace. The ropes are inexpensive and easy to swap out, so it’s not really a downside for us. Overall, this is a fun and clever toy that keeps my dog entertained. 🐶
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Reviewed in the United States on January 5, 2026
★★★★★ 3
Great for 2 Days…see comments
So it’s great toy and had our dog entertained immediately. However probably won’t last very long with medium to large dogs that gets obsessed with killing every toy you give them. Our Pitt mix loved this until she ended it by chewing through the heavy plastic ring that keeps the ropes connected. Without the noted ropes attached, the toy cannot move around. Basically ending the fun. Would be great to start a puppy or smaller dog on. It has multiple modes and is noise and proximity activated. Our dog was obsessed but sadly it was no match for her. 3 stars only because it didn’t last more than two days with our dog.
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Reviewed in the United States on January 31, 2026
★★★★★ 2
Good but not tough
My dog loved it but he figured out how to open it pretty quickly. I think I’m doomed to never find an interactive dog toy that can survive my golden
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Obsessed, crappy rope
My pitbull mix is obsessed! I was worried he might break it, but he has used it everyday for the past week and we've had no issues. The reason I docked a star is because the rope it comes with lasts minutes. I'm still trying to figure out a good solution of what to tie onto the top. Regardless, he loves it without anything on it, but he chews on the connector piece so I'm worried he will break it if I let him go.
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Reviewed in the United States on April 21, 2026
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