So I’m sure a lot of you guys have seen this post. If not, you might want to look at it to understand what I’m talking about.
It gives a good example of why some people think near IPD is what we’re supposed to use. Really, it’s not but it does result in a more focused image. Now, some might ask. Why did Pimax make it so that the IPD is not measured from the center of the lenses? Well there are a couple possibilities. One would be that they wanted to advertise a larger IPD range. Two would be that they needed to do this in order to reduce distortions. Or, maybe a bit of both. Anyway, some people really don’t like this because it results in the image being slightly out of focus. So naturally people will just reduce the hardware IPD until the lenses are in focus.
However, if I understand it correctly this causes an issue. Pimax’s software assumes that your eyes aren’t seeing directly through the sweet spot. It thinks your eyes are looking more through the edge of the lenses. This is a problem, because Pimax moves the image to match with the IPD they display. However since your eyes aren’t where Pimax think’s they are, they put the image in the wrong spot. This results in your eyes looking somewhat inward, sort of like when you’re looking at your nose. Obviously this is very uncomfortable and results in eyestrain. My hypothesis is that by setting the IPD offset as the difference it takes to get to the center of the lenses (plus a bit more since we are looking at a different location on the lens), you should be able to fix this and get a normal focused image without eyestrain.
Here’s an example. Let’s say your IPD is 65 but you need to reduce the hardware IPD from 65 to 61 in order to see through the sweet spot of the lens. That’s a reduction of your normal IPD by 4. So, you should increase the IPD offset by +4(plus another few mm to center the view). Now unfortunately I can’t test this right now, because my computer is not finished. But if anyone else wants to try this, please let me know if it works for you. I may be wrong here, but if I’m understanding how Pimax’s IPD works then this should fix the problem in this specific scenario. You’re essentially moving the center of your view over to the sweet spot of the lens via the IPD offset.
(Edit: Doesn’t work In theory it should, but in practice it doesn’t. Weird )