![]() The same problem occurs with any type of high FoV rendering, you increase the computational costs a lot for the less important parts of the image, which is why most VR HMDs aim for 90°-110°, so that the already restricted resources are used for the more important center of the vision. The projection of a flat screen onto a spherical retina means that the further out you go, the more pixels per degree you need to display, so you have to render more screen space for less visible image in the outer regions. Lens distortion gets a lot worse the more the view deviates from looking straight forward through the lens center. This might seem beneficial, but comes at a price. You can of course render more and use a 7" or 8" screen, and you eyes can see more than the two circles, but the image centers will have to remain at IPD distance, so everything beyond 5.9" just appears in your peripheral vision. For a typical 65mm IPD this means 130mm, which is about the width of a 5.9" 16:9 screen. Due to the physiological eye movement restraints you see the most of the screen if both eyes look straight forward and the two non touching circles both have a radius of half your IPD, making the "usable" screen width twice as wide as your IPD. This is what limits the screen size, as you cannot just move the screen further away to use a larger area without getting the images to overlap. Simplified you are looking at two circular (for convex lenses) images that mustn't overlap. Consequently it is possible to get the brain to see a 3D image on a smaller screen by moving the rendered image centers and the lenses closer to each other, but not on a larger screen by moving lenses and image centers further away. Why should the lenses be lined up with the middle of the 2 sides?īecause your eyes can move inwards towards the nose (to focus on close objects), but never outwards. I still use it though for 3d SBS full movies, while propping it with a finger to support its weight - the quality of viewing is that much better compared to my Galaxy S4. ![]() The ergonomics are the most difficult part of the equation, I have modded a Colorcross in order to avail of its 3 stripes and very light body and it is still quite heavy on the nose bridge. The 7" also fill in a lot more of the FOV of the Colorcross lenses. You mentioned the good screen quality and I agree that the RGB screen on the Kindle Fire HDX looks to me even superior to the CV1 screen (without the low-persistence, simply from resolution and fill rate perspective). The large screen has also an advantage of very little distortion on the lens side, so you can view regular SBS videos with it with no additional distortion introduced. There is of course the downside that your IPD should be pretty wide for you to view it comfortably from the lenses that in the default case should be right in the middle of each of the sides. I have used Kindle Fire HDX and with the Colorcross lenses the match is pretty good, TBH. The commercial option for this is the Dive 7" headset.
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