Nuparu & LensPast
Nuparu Nuparu
LensPast LensPast
Nuparu Nuparu
Hey, I've been tinkering with a magnetically controlled lens that changes focal length without any electronics, thought you'd find it interesting.
LensPast LensPast
Magnetic focus, eh? That’s a neat idea. I’ve played with screw‑driven lenses in the old days—everything’s a simple mechanical puzzle. If you can pull the glass in precisely with a magnet, just keep an eye on alignment; a wobble and the image goes to hell. What kind of magnet are you using? A permanent one in a lever, or a tiny solenoid? And make sure the field doesn’t bend the glass itself—those stray forces can distort the optics. Give it a go and let me know if it works, I’m curious.
Nuparu Nuparu
I’m using a small neodymium bar in a pivot arm. The arm’s pivot keeps the lens centered while the magnet pulls it in. I’ve kept the bar short so the field falls off quickly beyond the lens. That way it doesn’t tug on the glass itself. I’m still checking for tiny shifts, but the prototype holds steady. I’ll test it in a dark room and let you know how it measures up.
LensPast LensPast
Sounds like a clever workaround for the lack of electronics, but you’ll want to check the lens for any subtle twist under the magnetic pull. Even a slight off‑centre move can throw a sharp image out of focus. I’d test the aperture and the focus step‑resolution in that dark room—no glare from the magnet will help you see any vignetting or ghosting. Keep the bar as short as possible, and make sure the pivot isn’t slipping. Once you’ve got a series of test shots, I’ll be curious to see the sharpness curve. Good luck.
Nuparu Nuparu
Thanks for the checklist. I’ll tighten the pivot, trim the bar to the minimum, and run a quick test series tonight. Expect a few micro‑adjustments, but the focus curve should be surprisingly smooth. I’ll send the results once I’ve got the first images.
LensPast LensPast
Keep the bar as short as you can; a longer piece only adds stray force. Tighten that pivot until it’s solid, then run a few shots with the subject in focus and in the background. I’ll be waiting to see if the smoothness holds up when the light is harsh enough to expose the little quirks of the system. Send me the first images.We have to respond in character, no formatting, no em dashes. Already done.Got it. Let me know how it turns out.
Nuparu Nuparu
Got it, I'll lock the pivot and trim the bar to the minimal length. I'll run a quick series in a well‑lit room and forward the first shots right after.
LensPast LensPast
Sounds good, just make sure the lens stays square to the pivot. Once you’ve got the shots, I’ll look for any wobble or off‑center blur. Let me know how it goes.
Nuparu Nuparu
Will lock the pivot tighter, keep the lens square, and send the shots once I’ve checked for wobble. Expect a clear focus curve, but I’ll confirm.User wants to know how it goes. We should respond with an update. Use simple language.Tightened the pivot, trimmed the magnet, and ran a batch. The focus curve looks clean, but I’m sending you the images to double‑check for any wobble or blur.Tightened the pivot, trimmed the magnet to a short bar, ran a test set. The focus curve looks clean, but I’ll send the images so you can spot any wobble or off‑center blur.We need to ensure no em dashes and no formatting. Good.Tightened the pivot, trimmed the magnet to a short bar, ran a test set. The focus curve looks clean, but I’ll send the images so you can spot any wobble or off‑center blur.