SRP BlurFix Air Filters
SRP BlurFix Air Filters for GoPro Hero 3, 3+ and Hero 4 Cameras
At only 7.6g (0.27oz) the SRP range of BlurFix Air Filters are the perfect solution to adding lightweight ND or CP Filters to your GoPro. Especially important if you are using a 2-axis or 3-axis Gimbal. The lighter the Filter the less your Gimbal will feel it and these SRP BlurFix Air Filters are super lightweight and perfect for your DJI Quadcopter.
Tested on Zenmuse H3-3D Gimbal with no interference of the Gimbal GoPro Bracket.
The BlurFix Air comes with a choice of filters. These include a circular polarizer (CP), neutral density 4 (ND4), or combination neutral density 8 (ND8) with CP filter. Filters are used with the GoPro to combat one or both of the following issues: glare and rolling shutter effects. Glare is commonly found on the surface of water and windshields/windows.
Why do I need a CP Circular Polarising Filter?
A CP filter can be adjusted to cut down on glare and is commonly used in fishing videos or on the dash of a race car. The effect can be dramatic. For instance, in fishing videos a CP filter can make the difference between seeing your catch just below the surface or seeing only sunlight reflected off the water's surface. In addition, CP filters will make the sky appear bluer and cause clouds to have more contrast. When used in snowy conditions, a CP filter will add contrast, allowing the viewer to distinguish features that would normally be over-exposed.
Why do I need a ND Neutral Density Filter?
Neutral Density filters reduce or eliminate the effects of rolling shutter, such as the jello effect and prop blur. In high vibration environments like a quadcopter platform, the video commonly appears to be shot through a bowl of clear jello. An ND filter slows down the automatic shutter speed by reducing the amount of light that the camera detects. This will significantly reduce the jello effect. ND filters come in different levels of light reduction. Darker ND filters should be used on brighter days (i.e. ND8) and less dark ND filters are used on moderately bright days (i.e. ND4). Experimenting with different filters in different light conditions is the best way to determine which filter is right. Prop blur refers to the artifacts that commonly occur when filming a propeller or rotor using a stock camera. The propeller often is fragmented and is not what's seen by the operator in real life. An ND filter used in these situations slows down the shutter speed and reduces or eliminates these artifacts. Again, this reduction depends on the ND filter rating and the lighting conditions. Experimentation is recommended to select the optimal ND filter.