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M13 Comparison

Comparisons

Typical 8"

12.5"

15"

18"

20"

22"

25"

Light gathering power over typical 8" Schmidt-Cassegrain - 2.5X 4X 5X 6X 7.6X 10X
Limiting stellar magnitude: 14.0 15.0 15.5 16.0 16.5 16.7 17
Rayleigh Resolution Limit: 0.68
arc seconds
0.38
arc seconds
0.36
arc seconds
0.31
arc seconds
0.27
arc seconds
0.25
arc seconds
0.22
arc seconds
Contrast Limit:
(minimum diameter before
a nebular object fades from view)
11
arc minutes
6.0
arc minutes
5.7
arc minutes
4.8
arc minutes
4.3
arc minutes
4.0
arc minutes
3.4
arc minutes