Where is the world's longest lenticular telescope?

In Germany
In France
In Spain
In Norway
Big Spotlight - the world's longest 21-meter-long lens telescope. It is located in the astronomical observatory in Berlin.
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Answers by country

In Germany
In France
In Spain
In Norway
answers
flagGreece
66%
11%
11%
11%
18
flagAustralia
65%
7%
7%
15%
26
flagFrance
57%
28%
0%
14%
14
flagthe United States
53%
17%
9%
19%
134
flagthe Philippines
50%
16%
27%
0%
18
flagItaly
50%
30%
20%
0%
10
flagIndia
49%
19%
12%
16%
242
flagSwitzerland
47%
21%
4%
26%
23
flagPoland
38%
21%
12%
27%
3385
flagGermany
38%
12%
19%
29%
239
flagCanada
36%
18%
18%
27%
11
flagthe United Kingdom
34%
13%
20%
29%
88
flagPakistan
33%
20%
20%
26%
15
flagRepublic of Ireland
27%
18%
0%
54%
11
flagthe Netherlands
26%
21%
10%
36%
19
flagAustria
24%
17%
20%
37%
45