I just got my 8KX. The picture is quite blurry and I understand that it normal takes some tuning to get the visuals perfect. The picture looks like there was a protection sheet on the lenses, but it doesnt seem so looking at the lenses( havent tried peeling to much…)
Moving around the headset and tuning IPD doesnt help much.
I have 20/20 visuals(pilot, so I know this). Beeing a bit older I have started to get Presbyopia and I wear progressive glasses for reading, but not for anything else.
It feels a little bit like the focal length that is set by the pimpax lenses is way shorter than other VR sets(I have Oculus CV1 and HP Reverb) and that my aging sight makes me unable to focus sharp on the picture. I have no problems at all with Oculus or Reverb, where I see everything sharp.
I tried my glasses but as they have plan glass looking straight ahead I didnt get mcuh help from that.
I will try to find some reading glasses that myght help focus closer than my minimum distance.
Any one having any information about this, and the focal length on the pimax ?
To me, it feels like it’s about 1m. I’m quite near-sighted, so I don’t need glasses for my Pimax (even though I wear progressive lens glasses for driving and such. @PimaxQuorra, can you please find out what the focal distance (apparent optical distance looking through the lenses) is? Thanks!
Yes, it would be nice to know this value for sure.
I will get reading glases and test with those.
When knowing the focal distance I guess I can get lenses that gives a sharp image @ focal distance.
This is about what I found out after reading neal_white_iii’s post. Did a quick check without glasses reading a magazine, and the feeling I got was that I see much sharper @1m than I currently see( need to fix this) in the 8KX.
When my flying career is over it will be easy, I get a lens change to multifocal and order the closest focal to be as per the focal distance of Pimax
I just did a trick to try to find out.
I called two friends with glasses that I know is nearsighted, and which of both have tried oculus/Reverb at my place. One of them have more or less aborted trying VR at my place earlier because he cannot se anything sharp with Oculus or Reverb.
Both these guys could see sharp with my 8KX, and both was blown away
Now I know fore sure the issue for me is focal distance. I can not focus sharp on the picture in 8KX because my aged eyesight that needs around or just above 1 meter to see sharp.
It would be very nice to know the actual focal distance to be able to make a solution thats spot on. I’ll begin with reading glasses that give me sharp visuals about 0.75m.
[Edit] I found some reading glases that I tried with and most of the blurriness was gone.
Just need to find the exact number and get new ones.
This is very surprising indeed to me. Such a short focal distance probably helps me (being 20/20 and very slightly nearsighted), but for most users, this probably makes vergence accommodation conflict worse.
@AAKEE In theory, you can (gently!) remove the lenses with suction cups, and add a bit of shim material around the edges, to increase the focal length. That may be your best option, since no prescription lenses cover the full FOV.
No. Somewhere on these forums is a link to relatively large prescription lenses to be used with Pimax headsets. They don’t cover more than 2/3 of the available FOV IIRC, which of course results in some artifacts.
In general, there is a reason contact lenses exist… in terms of technology though I don’t think there is any optical reason full-size prescription lenses couldn’t be made for Pimax headsets. They just aren’t.
A 0.5mm shim under each lens makes my 8kX significantly less of a strain on the eyes (for me), and sharpens things up a little bit farther away from the lens centres (not all that much, though – things still go past-the-pain-threshold-ly indistinct, before reaching the opposing edges of the scanner plate in Elite Dangerous, when looking straight at it; The view still “feels flat”; And the tiny spot right in the centre of each lens remains superiorly sharper, than what I get just a degree or two to its side).
At 1mm extra lens-to-screen spacing, I have begun to go back out of focus again. Wish I could figure out some simple way to get focussing screws in there, that one can reach from outside for live adjustment, separately for each side of each lens (the lenses are canted 10° each, and then each screen an additional 9°, or thereabouts), and the rather hard part: without doing anything irreversible to the HMD, and also still have things well sealed.
Yep. Can’t quite seem to get the lens outline shape right, though; Would probably have been faster to cut out of cardboard or hard rubber, than arriving at the approximation I’m currently at.
I have reading glasses +1 i need them up to 70 cm. When in the 8kX the pimaxlogo gets blurry a lot using them. Without it, it’s very sharp so the focal distance must be more, it’s interesting i hope pimax can answer this.
(edit) The bluriness resembles looking at my tv at 2,5 meters distance with the same glasses.
I went to the local drugstore and bought me reading glasses that seem to have good focus between 30cm to arm length, and sweet spot somewhere in the middle for me.
With these I get really sharp picture.
The mystery/problem solved. Will get wider reading glasses from the optician later, and would need to know the focal distance to get it perfect.
pimax did not answer that question for more then 1.5 years, i would not have to high hopes of getting a answer now
there must be theoretical vales they used for focal distance and eye relief when designing the lenses but for some unknown reason they don’t tell
That information would help anyone that did get pimax but isnt happy due to not getting the picture sharp etc.
Practially, I think we know it is well below two meters, and probably not more then one meter. I think it will be good enough to go for 0.75m so we can live without knowing the correct data. But it would be nice to know, and it would also better be some information on the pimax sites, so people dont buy not knowing and after that get unhappy.
