Features of TFK-20 52-60 5pc Set: ▪ PV Adjustable range (5 specifications): 52mm, 54mm, 56mm, 58mm, 60mm. ▪ Axial calibration on each diasc: 165º ~ 0º ~ 180º ~ 25º axis graduation line runs counter clockwise along axis graduation line of lens frame, with interval of graduation line being 5º. ▪ Lens rotates around optic axis inside lens frame: 360º. ▪ Range of left or right lens frame legs, length adjustment: 90m ~ 99mm, length of specification of trial frame increase 1mm in turn. |
PD Adjustable Range | 2.05in, 2.12in, 2.20in, 2.28in, 2.36in |
Axial Calibration on each disc | 165º ~ 0º ~ 180º ~ 25º axis graduation line runs counter clockwise along axis graduation line of lens frame, with interval of graduation line being 5º |
Lens rotates around optic axis inside lens frame | 360º |
Range of left or right lens frame legs, length adjustment | 3.54in ~ 3.90in, length of specification of trial frame increase 1mm in turn |
PD Adjustable Range | 2.05in, 2.12in, 2.20in, 2.28in, 2.36in |
Axial Calibration on each disc | 165º ~ 0º ~ 180º ~ 25º axis graduation line runs counter clockwise along axis graduation line of lens frame, with interval of graduation line being 5º |
Lens rotates around optic axis inside lens frame | 360º |
Range of left or right lens frame legs, length adjustment | 3.54in ~ 3.90in, length of specification of trial frame increase 1mm in turn |