Advice on extreme IPD mod?

The OP’s IPD of 64 “might” not need the mod?? My IPD is 62, while the HMD will display my correct IPD in the headset, the spot in the lens where my eyes look at is a blurry image, the lenses needed to come closer together for the non blurry spot in the lenses to come into view, then I had to go back and adjust the actual “image” IPD to match the new lens IPD.

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Ok… Before you do anything drastic, I suggest you read this: Clarifying Near IPD x Distant IPD confusion

There is a perfectly good reason the lens c-c spacing is greater than your IPD, and if applies equally well to other headsets with canted lenses - most certainly the Valve Index, and your first course of action should be to try modifying the thickness of the face interface padding, so that the eye relief is right for getting your pupils intersected by the lens axes. Your 64mm IPD is (or at least close to) the median among people, around which the adjustment range of almost all HMDs, including the p8k/5k series, is centered.

I’ve done the mod, and it didn’t help me, predictably - not only because my IPD is only 59-60mm, and not only because with these lenses, at least my particular eyes give me only a tiny pinprick of sharp imagery in the very centre, even when perfectly positioned (this is the real problem), but also because the whole notion of trying to get the lens spacing down to one’s IPD is misconstrued to begin with, and comes with a host of detrimental consequences.

My unit had a millimetre or so to go on the potentiometer’s medial end, so as long as I didn’t file down more than that on either side, I didn’t need to do anything to the coupling between the lens shuttle and the potentiometer; If you do move the hole, you’ll just need to apply the corresponing offset in PiTool settings, to get the reading correct.

EDIT: It is probably worth mentioning, and keeping in mind, that by opening my p8kX up, and modifying it, I have of course made it ineligible for the trade-in upgrade offer, to the upcoming p12k… (EDIT2: …as well as voiding any outstanding warranty.)

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Ok thanks. I will DM you my email with you would be so generous as to send those pics. How was your experience with the headset after the mod? how was the image, FOV, and distortion, ect?

An IPD of 64 is pretty average and should not need the IPD mod. As mentioned above, you should try changing the distance between eyes and lenses and see if this improves the image for you. Like switching between thick and thin cushion, pushing and pulling the headset a little. From my personal experience, 1 mm more or less can make a huge difference.

In my case, I noticed that the ideal distance for me is right between thick and thin cushion. I ordered some velcro tape from Amazon and applied it to the back of the thin cushion. Using that, I get a clear image. Optimal IPD setting also aligns with my actual IPD (65 mm)

There are also some third party cushions you could give a try:

If that doesn’t work, you could try fiddling with the IPD offset and screen vertical offset settings in Pitool.

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The only thing it did for me was clear up the blurriness. Fov seemed unchanged, I never really saw much distortion to begin with unless Im looking for it when I turn my head.

The other issue I had with the 8KX and the 8K and 5K+ was “eye strain”. I had to sell all of my Pimax headsets for this reason. I tried to find the link to a post on this forum I made regarding the eye strain, I think Pimax deleted it, LOL. It had like over 500 replies! If your not having that issue, the Extreme Mod might be a viable upgrade for you. Bierbaron mentioned trying some face cushion mods first. I would suggest that also. Didnt work for me but I would be willing to try ANYTHING before doing the Extrem IPD Mod, it was quite the undertaking and you can easily ruin the headset. I Effed up a couple things while performing the mod, I tore a ribbon cable and something else, cant quite remember, so I had to repair my damage all along still performing the mod.

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Thanks. I have tried all of that for a week now. No position worked other than moving the headset to the sied to put my one in the sweet spot. When i adjust the ipd through pitool, it makes it a little less blurry, but makes my eyes cross eyed, and causes major eye strain. Im using my oculus quest 2 as a reference. In my quest 2, the image is much more clearer. Id like to avoid the mod if it was possible. Does not look fun to do.

I think this maybe the post you might be looking for.

In search use @username keyword
:mag_right: @stixvr eye strain”

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I saw that one Helio. I searched for eye strain and eyestrain in the topic and under my user name. I couldnt find it. Maybe I used different words in the topic… There was like 500 replys. Lots of folks with that issue trying to find a fix

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I tried most of the fixes but none worked for me regarding the blurriness, the extreme mod made the image crystal clear but just didnt help with the eye strain like I hoped. I did the mod knowing that it might not fix the eye strain… uuuh

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Do you recall if you were the Op?

Well that was quite a while ago and I was thinking that I did start the thread, maybe I didnt??

I think I found it. The Op was the one whom had tons of accounts on here.

@Jasonkane this guide may help.

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Thats the one, remember PimaxUSA saying the 800 replys was like just a dozen of the same posters, lol. And that this was anecdotally…

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Do you by any chance wear, or need reading glasses?

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I wear contacts. And my Oculus quest 2 is crystal clear. So its not my vision.

That is just incorrect. First it’s considerably less than that and second the lenses are canted so the calculation is more complex than a simple distance measurement. I have never seen a person with an ipd of 64 where the issue was lack of adjustment real estate.

My IPD is 58 and I can get it into focus adjusted into the smallest IPD. It is likely if you cannot achieve clear focus at IPD 64, your issue is almost certainly not IPD related.

That said… in some cases the extreme ipd mod could help anyway because simply having a greater range of distances across the lenses gives you in effect more real estate to adjust your *positional focus through the lens. In some cases the issue was alignment of the panels at the factory and that can potentially correct for that.

I suggest the following:

  1. look into individual alignment of vertical IPD and see if using the software to move it up or down on individual eyes improves your clarity.
  2. Slide the back side of your headset so that the bottom of the plastic almost touches your neck. Rotate it as far as possible and see if this changes the angle enough to improve your view.
  3. Try changing the distance to the lenses, manually move it directly closer and further away too see if thicker or thinner foams can solve the problem.
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Indeed @Yen ipd guide is quite detailed. However there are setup issues for a wide variety of users due to no proper Ipd setup Wizard and design issues.


How is the presentation coming for the 12k?

What are the steps you take for IPD 58 on the 8KX for yourself? I really like the headset but I can’t handle the blur and I seem to be IPD 58-60 myself, which foam did you use etc?

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I have helped a large number of people setup and found that IPD really isn’t usually the determining factor. It’s the facial structure and position of your eyes. I’ve had people who have a very low IPD regularly get it perfectly clear and then a person shows up with like an IPD of 65 who can’t. Since the lenses are canted it’s also not as easy to calc a universal ipd value to calibrate to.

That said…
For myself I use the dial all the way to the left and it’s clear for me at 58 but there are people who are very sensitive to other factors.
I use a method similar to the steps MRTV uses here:

When calibrating for customers who have trouble the only difference is I also use small text and calibrate with the software starting in the center. But really his guide is great and will work for most people and his version also calibrates real world object positioning vs. virtual to combat fatigue.

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