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Old 20-01-2010, 04:06 AM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
For mirror type diagonals:
From the front nosepiece/ body "shoulder" to the eyepiece "shoulder"
1.25" diagonal = 80mm
2" diagonal = 110mm
Difference = 30mm

Hope this helps
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