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Did you know...
The top of the arch actually rises and falls about 180 mm due to changes in the temperature!
For everything in this world, there is a start point. By the way here it is for me to a new world of light. Thanks to 'Johann Zahn' who seeded for this world long ago in 1685. I am a recreational amateur trying to grasp the concepts behind lenses, Excuse me !!
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