Headband Glasses with Five Lenses - 14.9892B
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Headband Glasses with five kinds of multiple lens plates. When magnifying ratio becomes larger. the focus will become shorter and visual field range becomes narrower. Therefore, it is advisable to choose the lens with minimum magnifying multiple to meet your magnifying needs.
Lens Plate - Magnifying Ratio - Focus - Field of View
# 1 1.0X 24" 250 - 350mm
# 2 1.5X 20" 200 - 300mm
# 3 2.0X 10" 175 - 275mm
# 4 2.5X 8" 150 - 250mm
# 5 3.5X 4" 80 - 120mm
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