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| Farewell to the DSLR camera |
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| mawyatt:
--- Quote from: tooki on July 30, 2022, 03:48:44 pm ---What’s funny on the Nikon side is that they used to do that a lot more! My old D70s used a shutter curtain up to 1/250 (IIRC) and everything faster than that was electronic. (So it never did moving-slit exposure.) But it used a CCD image sensor, not CMOS. --- End quote --- Nikon stayed with CCDs for much longer than Canon an others, they had specific advantages beyond just noise over CMOS, like the electronic shutter. Even today think CCDs still have a DR advantage over CMOS. Regarding the lenses discussion old vs new designs, many of the very old lenses utilized special glass that is forbidden today. The old Lomo microscope lens we have believe used some form of radioactive glass that has been banned for a long time. No it doesn't "glow in the dark" ;D Best, |
| TimFox:
I don't own one, but there were classic apochromatic lenses made for medium- and large-format cameras containing lanthanum-glass elements, under the trade name "Apo-Lanthar". Voigtländer now makes modern lenses (for Sony mirrorless cameras) with that trademark, but I doubt they use (slightly) radioactive lanthanum glass (apparently an alpha emitter due to a minority isotope and possibly thorium included in the mixture). In general, heavy elements (such as lead and rare earths) will increase the optical index when mixed in glass. After thoriated glass fell out of favor, the less-radioactive lanthanum replaced it. see https://www.fourmilab.ch/documents/radiation/lens/ |
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