Recent content by mike1127

Ah, we are getting closer. The curvature is different, yes (with different indices). That makes me wonder: Well, let's consider a ray coming out of my pupil which intersects the inner surface of the lens. At the optical center that ray is perpendicular to the lens surface. Moving away...

Here's the wikipedia article http://en.wikipedia.org/wiki/Corrective_lens

a post to reach 10

Thanks for finding it but this doesn't help. It gives little information about high-index plastics, the very plastics that I want to know about. I'm aware that Trivex has just about the highest ABBE value of any plastic but has too low an index to be useful for me (would make a very heavy/thick...

I *do* know the ABBE value and the index for each type of plastic. Again, my question is whether the color fringing depends on the ABBE value alone or whether it includes the index. I assure you the differences between materials are extremely obvious. The question is, how much of my visual...

I'm aware that chromatic aberration can't be corrected with a single material, but I would like to find a material that minimizes the color fringing and I would like to know how to predict that, knowing the ABBE value and the index. In particular I'm wondering if it's something that depends...

Well, I'm trying to determine what index plastic I should use for my next lens. There seems to be two kinds of distortion that are most obvious, as seen by me when I look away from the center of the lens. One of them is chromatic aberration -- I believe this is chromatic aberration because...

Thanks everyone. This is great information. Unfortunately I can't use contacts due to chronic eye irritation that I have. I still would like to know if there is some way to predict distortion -- I need to choose which plastic to use to make my next glasses -- for instance, 1.56 vs. 1.60...

I have high-power eyeglasses (about -10 diopters in one eye, and -12 in the other). I have always been bothered by the chromatic abberation--- almost any visual object (reading text, reading music, street signs, traffic lights, etc) is clear only in the center of my lens, and gets increasingly...

There are timing issues in trying to control the organ from the PC directly, like OS interruptions. However, there is a little fact about the psychology of playback which makes it possible to have a latency in response. Software samplers (music sampling synthesizers than run on a computer...

Thanks for the suggestions! I will look into them.

I'm setting out on a project, and I need some basic direction. I am a programmer by trade; my father is a mechanical engineer who is pretty good at electrical circuit design as well---together we want to control a pipe organ by computer. The organ is already operated by electrical solenoids...