MICROSCOPE OBJECTIVE LENS PLAN 100 X/1.25 INFINITY/0.17 PROFESSIONAL HIGH-POWER OIL IMMERSION MICROSCOPE OBJECTIVE LENS. ? PLAN: INDICATES A PLAN ACHROMATIC LENS. THIS MEANS THE LENS IS OPTICALLY CORRECTED TO PROVIDE A FLAT FIELD OF VIEW

MICROSCOPE OBJECTIVE LENS PLAN 100 X/1.25 INFINITY/0.17 PROFESSIONAL HIGH-POWER OIL IMMERSION MICROSCOPE OBJECTIVE LENS. ? PLAN: INDICATES A PLAN ACHROMATIC LENS. THIS MEANS THE LENS IS OPTICALLY CORRECTED TO PROVIDE A FLAT FIELD OF VIEW ENSURING THE IMAGE STAYS SHARP AND IN FOCUS FROM THE ABSOLUTE CENTER ALL THE WAY TO THE OUTER EDGES. 100 X: THE MAGNIFICATION POWER. IT MAGNIFIES THE SPECIMEN BY 100 TIMES. WHEN PAIRED WITH A STANDARD 10X EYEPIECE IT PROVIDES A TOTAL USEFUL MAGNIFICATION OF 1000X. 1.25: THE NUMERICAL APERTURE (NA). THIS MEASURES THE LENS'S LIGHT-GATHERING ABILITY AND RESOLVING POWER. AN NA OF 1.25 IS HIGH AND REQUIRES IMMERSION OIL TO BRIDGE THE GAP BETWEEN THE LENS AND THE SLIDE TO AVOID LIGHT REFRACTION. THE INFINITY SYMBOL. LIGHT LEAVES THE BACK OF THIS OBJECTIVE AS PARALLEL RAYS. IT REQUIRES A MICROSCOPE FRAME EQUIPPED WITH A TUBE LENS TO FOCUS THE IMAGE ONTO THE EYEPIECE OR CAMERA SENSOR. YOU CANNOT MIX THIS LENS WITH OLDER MICROSCOPES THAT HAVE A "160" OR "170" MILLIMETER STAMP THIS ALLOWS LABS TO INSERT INLINE ACCESSORIES LIKE POLARIZERS FILTERS OR BEAMSPLITTERS WITHOUT CREATING IMAGE DISTORTIONS. 0.17: THE REQUIRED COVER GLASS THICKNESS IN MILLIMETERS. THE LENS IS OPTICALLY OPTIMIZED TO LOOK THROUGH A STANDARD #1.5 COVERSLIP (WHICH IS ROUGHLY 0.17MM THICK). USING NO COVERSLIP OR ONE THAT IS TOO THICK WILL INTRODUCE SPHERICAL ABERRATIONS AND BLUR THE IMAGE.