This section of mirror doesn't fog

https://lemmy.world/post/36421737

Uhh, because of the heat of the raspberry pi & camera behind there
Ahh yes, because that would produce exactly square shaped heat.
3,200 Megapixels: The World's Largest Camera is Almost Complete

Researchers at SLAC National Accelerator Laboratory are nearly done with the Legacy Survey of Space and Time (LSST) Camera, the world's largest digital

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