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Vinvika [58]
3 years ago
13

ASTRONOMY

Biology
1 answer:
lisabon 2012 [21]3 years ago
8 0

Explanation:

Larger lenses are heavier, and tend to sag under their own weight, ruining the image quality as the lenses distort. The long mounting tubes are hard to make mechanically stiff, and so they tend to flex under the weight of the lens, making it hard to keep the optics in alignment.

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