IMPORTANT: H8PRO Modified GoPro cameras are not waterproof.

Using the Camera for the First Time

Remove the plastic cap from the C-Mount spacer ring. It is sometimes assumed that the metal spacer ring is a part of the cap but it’s actually required to properly focus C-Mount lenses. Without the spacer ring the camera can be used with CS-Mount lenses. We also recommend removing the C-Mount spacer ring when using the included M12 to CS-Mount adapter.

Cleaning & Changing Filters

The H8PRO camera comes with a protective glass filter installed. The H8PRO-IR camera comes with an IR-Cut filter so you can optionally block infrared light for normal color.  You may wish to remove these filters in order to clean, switch filter types or use a wide angle M12 lens that already has an integrated IR-Cut filter. Replacement filters are available in the accessories section of our shop.

  • Use the pointy end of the plastic spudger tool or some tweezers to gently pop out the O-ring holding the filter in place (spudger tool is located in camera case)
  • Turn the camera over and drop the filter into a microfiber cloth
  • If required, clean the sensor. We recommend using a Lenspen MiniPro followed by an air puffer. You can also use some lens spray and a microfiber cloth followed by a puffer. The same tools can be used to clean the filter itself.
  • Hold the filter by the edges. With the camera at a 45 degree angle gently drop the filter into the socket. Take care not to drop the filter edge first onto the sensor.
  • Replace the O-ring using your spudger tool.

Adding CS & C-Mount Lenses

  • If using the H8PRO-IR infrared camera make sure the IR-Cut filter is installed for normal color.
  • For C-Mount lenses add the 5mm spacer ring, for CS-Mount lenses remove it
  • Focus the lens as desired using the rear display or an external monitor (HDMI output is available via the GoPro Media Mod)
Pro Tip: Most CS & C-Mount lenses perform best between f4 and f8. Shoot with the iris wide open for soft focused backgrounds in your close-ups. Shoot with the iris closed down for sharp far shots.

Using Lens Adapters

If using C-Mount adapters to mount other lens types on your camera, make sure the 5mm C-Mount spacer is attached and the filter is properly installed.

Crop Factor Information

Lenses designed for larger sensors or film formats will appear somewhat magnified when used with the smaller 1/2.3″ GoPro sensor. Here are the focal length multipliers for several popular lens types.
  • 1/2.3″ M12 – 1.0x
  • 1/2″ C-Mount / M12 – 1.02x
  • 1/1.8″ C-Mount / M12 – 1.15x
  • 2/3” C-Mount – 1.41x
  • 16mm (Bolex) – 1.63x
  • Super 16 – 1.86x
  • 1” C-Mount – 2.05x
  • 1.1” C-Mount – 2.18x
  • APS-C – 3.42x
  • DX – 3.64x
  • APS-H – 4.42x
  • 35mm (Full Frame) – 5.54x

For more information on crop factors please visit this page.

Pro Tip: visit for a wide selection of lens adapters

Switching the Base Mount

The H8PRO comes with Back-Bone’s aluminum tripod mount pre-installed. If you’d prefer to use the original folding GoPro mount it’s provided in the camera package. Simply remove the four hex bolts using the supplied Allen key and place the original mount back on the camera. Use a Torx T5 precision screw driver to tighten until snug. Don’t overtighten as damage to the screw head may result. We recommend keeping the mount and screws in the baggie when not in use.


Got a question about your camera? Get up and running with our help! Take a look at our Troubleshooting Guide or FAQ for some solutions to common problems, if the answer isn’t there drop us a line.

For more help with our product please visit or email us

Mounting M12 Lenses

Note: Some super wide angle and fisheye M12 lenses may not be compatible with the H8PRO. The M12 lenses in our shop clearly list their compatibility in the product details. As a general rule M12 lenses with a back focus distance of 3.2mm or under are not compatible.

  • Remove the C-Mount ring
  • Screw the M12 to CS adapter ring onto the camera (Yellow Bag).
  • Gently screw in your lens and check to see if it will focus. If it stops turning before it’s sharp you will need to remove the filter from the camera. If it still will not focus after removing the filter it likely has a back focus under 3.2mm and is not compatible. Take the lens back out.
  • Thread the small black locking ring onto your lens.
  • Screw the lens into the adapter until sharply in focus.
  • It helps to connect the camera to a large screen via HDMI / Media Mod. If using the rear screen on the camera set the focus while zoomed in all the way in Photo mode. Zoom back out and take some pictures. Verify sharp focus across the entire image via GoPro app or PC.
  • Tighten the locking ring against the adapter to lock the lens in place.
  • You can also tighten the locking ring against the orange O-ring if desired.

Using the Slim M12 Mount

The H8PRO comes with an optional ‘slim’ mount dedicated to M12 lenses. Use this if you plan on mounting only M12’s or if you have a lens with an odd barrel or short threads that won’t move far enough into the standard M12 to CS adapter. Remove the CS-Mount ring using the supplied Allen key and use the four silver screws to mount the ‘slim’ M12 mount. It’s also designed to be reversible if you need a little more thread on the front of the camera.


  • If your M12 lens feels a little loose inside the adapter, try wrapping a layer of Teflon tape around it. That will ensure a snug fit so that the lens is perfectly aligned with the image sensor. Teflon tape is cheap and readily available in the plumbing section of any hardware store.

  • Keep an air puffer and microfiber cleaning cloth in your shooting kit so you can blow debris out of the camera if needed and keep your lenses crystal clean.
  • If you have a 4K TV switch your camera to 4K while focusing for the sharpest image.
Pro Tip: Get extra M12 adapters so you have one for each of your M12’s. Once you have them set up and locked in place in the adapter ring you can perform quick lens changes on the fly! Extra adapters are available at


My camera turns off after just a few seconds! Use the side button to power on the camera instead of the top. Quick capture is triggered by default when you hit the top button so it will try and record. If no SD card is found the camera will display the message ‘Insert SD Card’ on the rear screen and then shut off.
My M12 Lens Won’t Focus! Try removing the glass filter from the camera to give the lens some extra room to focus. If the lens still won’t go in far enough it likely requires a back focus distance of less than 3.2mm and is not compatible with the H8PRO. The lenses we sell in our shop have their compatibility listed in the product details. As a general rule, M12 lenses with a back focus distance greater than 3.2mm should be fully compatible. Back focus distance is sometimes called ‘Flange Distance’. Lens manufacturers usually supply that information in their product details.
My footage looks pink! You are using an H8PRO-IR camera which is designed to image infrared light. Infrared appears pink in recorded footage. For ‘normal’ color you will need to install the supplied IR-Cut filter which prevents infra-red light from reaching the sensor. If your footage looks pink this filter is likely not installed, or you are using an ‘IR corrected’ M12 lens which is designed for full spectrum & IR imaging. Most M12 lenses have the filter installed on the back but for CS, C-Mount and other lens types you will need to add it for normal use.
My C-Mount lens won’t focus!: This usually means that you simply need to add the supplied 5mm C-Mount spacer ring to the camera before adding your lens. It comes mounted on the camera with a plastic cap screwed into it. Also make sure that the protective glass filter is installed in the camera as that has a small effect on the focus of lenses.
Dark spots in footage, especially when iris is closed down: Your image sensor or filter needs to be cleaned. Using an air puffer is usually enough to blow away any small particles that might have gotten on the sensor. A LensPen MiniPro is also a great tool for cleaning the small GoPro sensor. Also verify that there is no dust or debris on the back of the lens.
Images are blurry on one side with M12’s: Likely your lens is not perfectly aligned with the image sensor. Some lenses have looser thread engagement than others which may cause a very slight tilt. Try adding a layer of Teflon tape to the lens barrel before adding it to the adapter ring as outlined in the tips.

NOTE: We’ve done our best to accommodate the vast majority of M12, CS and C-Mount lenses on the market, however there will be some designs that aren’t compatible. M12 lenses that are extremely short, have odd shaped barrels or short threads may not work. M12 lenses must have a back focus distance (flange distance) of 3.2mm or higher. The lenses at have their compatibility clearly marked. When buying M12 lenses elsewhere look for 1/2.3”, 1/2” or 1/1.8″ lenses. If you want to perform full spectrum or infrared imaging with your H8PRO-IR camera, look for ‘IR-corrected’ lenses. We recommend 1/2”, 1/1.8” or 2/3” C-Mount lenses with high resolution ‘megapixel’ optics.