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3mm Radian if you can find one. Otherwise 4-2mm Nagler zoom or 6-3mm Nagler zoom or both as they really are excellent performers. 2.5mm and 3.5mm NT6 Naglers are very good especially if you need the extra AFOV due to drift but I use the zooms more.
Both zooms are variable but have click stops. The 4-2 every 0.5mm and the 6-3 every mm in focal length.
Note they were called 2-4mm and 3-6mm but I noticed Tele Vue recently renamed them to 4-2 and 6-3mm (makes sense).
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