Yes, 11oz to 17oz is a 50% weight increase. But, are you comparing the same models ?
For example, I have two Leupold scopes of the same model ( VX6 1-6 x 24 ), one non-illuminated, the other illuminated.
The non-illuminated weighs 410 gms. The illuminated weighs 460 gms. The weight increase is 12%
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