I've use the FC60, Sky90, FC100 and the TSA120 ... all perform better with straight high power EPs than the 1.6x unit from Takahashi ... if you can handle the eye relief. The nagler 3-6mm zoom is exceptional in all regards except the small 50 degree FOV. The takahashi LEs are also stunning, but expensive and much more fiddle for small percentages of improvement vs the zoom.
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