What to look for in FPV Goggles
When you are choosing FPV goggles, there are a few things you’ll want to consider before making your purchase.
FPV flying is definitely more expensive ,FPV goggles are a one-time investment, so you’ll have to be prepared to spend at least $300-400 for some good Fpv goggles. There are some cheaper, ultra-DIY solutions, but at the end of the day, after all costs have been added up, they cost pretty much the same.
FPV are of two types – box type and goggle-type. Box goggles such as the HeadPlay HD and Quanum V2 are very big and so a little difficult to carry. They are very comfortable on your face, but transporting them is a little cumbersome. Other goggles such as the Fat Shark goggles are much sleeker and fit in a small case.
FPV flying for now is done by transmitting video the old-fashioned way – analog over frequencies! As far as flying multi-rotors(quadcopters) the most common frequency range is 5.8 gHz. Some goggles, such as the Fat Shark Attitude and Fat Shark Predator have a receiver built in, while some, such as the Quanum V2 and Fat Shark Dominator require separate frequency modules.
Going into detail about frequencies in some other post, but one thing you must know here is that frequencies have channels and bands. 5.8 gHz is a whole spectrum of frequencies, and most FPV flying is done over 40 channels. You must match the frequency of your video transmitter to the frequency of your receiver.
Some goggles like the HeadPlay HD and the Boscam goggles have a built in 32 channel receiver, which means they will be compatible with almost all transmitters. The Fat Shark Attitude and Predator have an 8 channel receiver, and with the Quanum V2 and Fat Shark Dominator, you can have any channel receiver from the ones available, so there is a lot more flexibility.
Resolution and FOV
Resolution is the amount of vertical pixels by horizontal pixels the screen in your goggles is capable of showing. A higher resolution means a clearer picture. FOV stands for Field Of View – basically how much of your vision the screen can cover. Smaller FOVs are smaller screens – and larger FOVs are larger screens.
There are two most common screen aspect ratios: 16:9 and 4:3. There is also 5:3 (1.666) which is close to 16:9 (1.777).
Your FPV camera is either 16:9 or 4:3, so you want to pick the goggles with the same aspect ratio to match it. Otherwise your image will look squashed or stretched. Although this might not be a huge problem but only a matter of time to get used to.
Currently, majority of the FPV cameras are still 4:3, but I expect to see more and more 16:9 cameras (such as runcam eagle and even fatshark 16:9 fpv camera), and personally I think it’s the way to go for future-proof.
Video Recording – Built-in DVR
Some goggles have a built-in DVR(digital video recorder). This lets you insert a memory card and record everything you see from the goggles. The recording will be nothing to brag about, because the camera sending the video isn’t the best, but this footage can be especially useful in retracing your flight path when you go looking for a crashed quad!
Headtracking: Certain models also have a feature called headtracking in which the camera on your model will pan and tilt according to your head movements. This is more useful for slower and higher flying where you can get an immersive view of your surroundings.
This is not such a big deal in multirotors, and probably more useful in fixed wing planes. Multirotors have very flexible yaw control, not so much in wings. Therefore it considerably increases the field of view and also for a safer flight.
On racing multirotors, you’ll be going so fast and in such tight spaces it is a bad idea to look away from exactly where your quad is going for even a split second!
As known as IPD. It’s the distance between the centre of the pupils of the two eyes. Having IPD adjustable helps both eye pupils to be positioned within the exit pupils of the viewing system.
Diversity basically mean there are more than 1 video receiver in the system (usually 2), the diversity will automatically choose the receiver with best reception, therefore giving you the best possible video link.
Each receiver has their own antenna, and these antenna can be pointing at a different angle, or they can be different type of antenna with different gains.
For comparison and more details specs of all Goggles read this : Compare of Goggles