National 420 Series Aux. Lenses
National Optical Auxiliary Objective Lenses:
705-420: 0.5X Aux. Lens: Reduces Mag. 50%, Increases Working Distance from 75mm-131mm
775-420: 0.75X Aux. Lens: Reduces Mag. 25%, Increases Working Distance from 75mm-91mm
715-420: 1.5X Aux. Lens: Increases Mag. 50%, Decreases Working Distance from 75mm-33mm
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National Auxiliary Objective Lens OptionsNational 705-420: 0.5X Aux. Lens: Reduces Mag. 50%, Increases Working Distance from 75mm-131mm, National 775-420: 0.75X Aux. Lens: Reduces Mag. 25%, Increases Working Distance from 75mm-91mm, National 715-420: 1.5X Aux. Lens: Increases Mag. 50%, Decreases Working Distance from 75mm-33mm
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