- Filter Options
- Example Media
The 3.97mm is a 4K lens designed for the GoPro Hero, DJI Phantom 4/3, DJI Inspire X3 and Yuneec Typhoon H CGO3+ camera lines. With its 82 degree HFOV 16MP sharp 8 glass non-fisheye optics this lens captures the entire image sensor.
After removing the stock lens the 3.97mm threads in easily. No need to change to a different lens mount and all GoPro, DJI and Yuneec 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, so we recommend using the original glass lens protector to keep debris out. On the Yuneec CGO3+ camera the stock lens is the same diameter so no gap or modifications to the lens surround is required with the 3.97mm lens installed.
On the GoPro Hero, we recommend using an ND4 filter (or higher) with ISO400 for full sun shooting. On the Yuneec Typhoon H we recommend keeping shutter speeds at 1/500s or slower to reduce jello from the rolling shutter during full sun shooting. If the slower shutter speeds are too bright you can add ND filters to stop down the light.
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, DJI and Yuneec 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, 8 degrees narrower than the DJI Inspire X3 and Phantom 4/3 cameras and 16 degrees narrower than the Yuneec H CGO3+ camera, this lens brings your subjects closer without being too zoomed in to introduce unwanted image jitter. Available in a large selection of filters the 3.97mm can capture everything from beautiful RGB color to NDVI plant health images.
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 GoPro example media shown has this lens profile removed from the camera. Don't want to worry about sending your GoPro Hero camera in to be modified? We sell new cameras with this lens installed HERE.
Model Number GP39728 Focal Length 3.97mm 35mm Equivalent (on 1/2.3" sensor) 22.63mm Fisheye/Barrel Distortion NO Black Vignetting NO Weight (Stock GoPro 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 - 8 Elements Fits in GoPro Waterproof Case? Yes (Pressure on Lens Will Cause it to Shift Focus, So Use Extended Backdoor) GoPro Case Mod Needed? No (But Puts Less Pressure on Lens) Dust Ring Included? Yes (DR_A + DR_B)
Filter Type Description Visible Light RGB Filter (Recommended) This is the filter that most cameras have to capture Visible Light like our eyes see. All infrared (IR) light is blocked so the colors are normal. This is the same filter the stock camera has. No Filter This lens has NO filter on it, allowing all wavelengths of light through to the sensor including Visible and Infrared light. This lens will produce an overly pink image and the colors will be washed out and dull.
NDVI Filter (Red + NIR) Filter
Our NDVI filter captures reflected Near Infrared Light and Red Light that is mostly absorbed by plants. By post-processing the captured images you can apply a color gradient that shows the contrast between regions of healthy and non-healthy vegetation. The Infrared light will show up in the camera's blue channel and the Red light will show up in the red channel, making it very easy to separate and process for NDVI. Infrared Light (850nm) Filter This lens only sees a narrow band of Infrared Light around 850nm and is typically used with a Red Light filter camera to produce NDVI, ENDVI or similar agricultural health survey maps. Red Light Filter This lens only sees a narrow band of Red Light around 650nm and is typically used with an Infrared Light filter camera to produce NDVI, ENDVI or similar agricultural health survey maps. Green Light Filter This lens only sees a narrow band of Green Light around 548nm and is typically used with an Infrared and Red Light filter camera to produce ENDVI or similar agricultural health survey maps. Blue Light Filter This lens only sees a narrow band of Blue Light around 450nm and is used for various applications.
Example 3.97mm GoPro Media: