Telescopes at night

Leiden's old 10-inch telescope

Leiden’s Old Observatory houses a couple of antique telescopes. They can still be operated, although clearly they are not used for scientific work anymore. The oldest telescope at the Observatory is a wooden 6-inch refractor from 1838. Pictured above is the 10-inch refractor from 1883, with a focal length of nearly four metres. I was at the Observatory last Saturday and took a couple of pictures, playing around with a few different light sources. This one, with the sky overexposed, shows the light from the surrounding building and streets reflecting off of the clouds.

You can find the rest of the pictures here.

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