Thursday, March 22, 2007

No Achromat Just Yet

The seller for my binoculars ran out of stock. Might as well, I just learned that there is some color casting from those front lenses. Sourgrapes? Probably. On a brighter note, I have some parts coming in for the second prototype which will be a static/vibrating gg based around a Nikon F3 Type D focus screen.

This focus screen is thicker than the Canon Ee-A that other builders use because it has a built in condenser. The condenser is a plano-convex (PCX) lens that magnifies the amount of light that goes to the focus screen. That's a lot of big words! Not that I know a lot about optics, I'm still learning what it all means. I should explain it some more on this blog as each concept is understood by me. But the PCX simply means that the image that gets on the focus screen is brighter. More light to the focus screen makes it easier for the camcorder to record an image.

The Type D focus screen is, incidentally, a favorite for astrophotography. And it is supposedly has such a fine grain that it could be used static. The static design is based roughly on the aldu35. This was a parallel development for the spinning agus35. The aldu35 was later improved by having the gg vibrate to blur the grain.

All this talk is making me anxious. I sure hope that +10 Macro comes in soon so I can have prototype 1 working.

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