{"product_id":"amscope-20x-infinity-achromatic-objective-biological-optics","title":"AmScope 20X Infinity Achromatic Objective - Biological Optics","description":"\u003cp\u003eIn this review of the 20X infinity achromatic objective, the bottom line is clear: this lens is aimed at biologists and lab technicians who need a reliable, color-corrected 20X option for infinity-corrected microscopes. The reviewer found the objective delivers consistent mid-power magnification with improved color fidelity thanks to its \u003cstrong\u003eachromatic correction\u003c\/strong\u003e, and that it integrates easily with RMS-threaded objectives on systems using a 180mm reference focal length and 45mm parfocal distance. It is not a broadly compatible solution for every microscope, but where it fits it performs predictably for routine biological observation.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e20X magnification:\u003c\/strong\u003e Provides a useful mid-range power for cellular and tissue inspection without excessive working distance loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAchromatic correction:\u003c\/strong\u003e Reduces color fringing and improves color accuracy across typical biological specimens.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInfinity-corrected DIN-standard:\u003c\/strong\u003e Designed for infinity optical systems that use a 180mm reference focal length, enabling modular optical train use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRMS mounting thread:\u003c\/strong\u003e Standard 20.32mm RMS thread makes it straightforward to mount on compatible objectives and nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e45mm parfocal distance:\u003c\/strong\u003e Keeps focus shifts minimal when changing objectives on microscopes built to that standard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack finish:\u003c\/strong\u003e A durable exterior that resists glare and blends with black microscope turrets and housings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe objective is best for users working in biological labs, teaching settings, or hobbyists who own an infinity-corrected microscope with an RMS mounting thread and a 45mm parfocal standard. It is particularly suited to routine brightfield observation where accurate color rendition and modest numerical aperture are useful.\u003c\/p\u003e\u003cp\u003eUsers who should look elsewhere include owners of finite optical systems or microscopes with non-RMS mountings, and those who require immersion objectives or higher numerical aperture imaging for demanding research microscopy. This is a specific replacement or upgrade part, not a universal fit.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAchromatic design improves color accuracy and reduces chromatic aberration for clearer biological images.\u003c\/li\u003e\n\u003cli\u003e20X magnification with NA 0.40 delivers good mid-range detail for many specimens without complex handling.\u003c\/li\u003e\n\u003cli\u003eStandard RMS thread and 45mm parfocal distance ensure easy mechanical compatibility with matching microscopes.\u003c\/li\u003e\n\u003cli\u003eInfinity-corrected DIN-standard design makes it compatible with modular infinity optical systems using a 180mm reference focal length.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot compatible with finite tube length microscopes or non-RMS mounts, so fit must be confirmed before purchase.\u003c\/li\u003e\n\u003cli\u003eFixed nosecone and air objective design mean it is not suitable where immersion optics or adjustable nosecones are required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e20X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture (NA)\u003c\/td\u003e\n\u003ctd\u003e0.40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrections\u003c\/td\u003e\n\u003ctd\u003eAchromatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical System\u003c\/td\u003e\n\u003ctd\u003eInfinite (infinity-corrected)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference Focal Length\u003c\/td\u003e\n\u003ctd\u003e180mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Thread\u003c\/td\u003e\n\u003ctd\u003eRMS 20.32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal Distance\u003c\/td\u003e\n\u003ctd\u003e45mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThis 20X achromatic infinity objective is a pragmatic, value-minded choice for users with compatible infinity-corrected microscopes who need accurate color and dependable mid-power magnification. It is not a universal solution, but for biology labs and instructors with RMS-mount systems it offers solid optical correction and mechanical compatibility at a reasonable trade-off between performance and specialization.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this objective fit my microscope?\u003c\/strong\u003e\u003cbr\u003eIt fits microscopes that accept RMS 20.32mm threaded objectives and are designed for infinity optical systems with a 180mm reference focal length and 45mm parfocal distance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an immersion lens?\u003c\/strong\u003e\u003cbr\u003eNo, this objective has a fixed nosecone and is specified as an air objective; it is not intended for immersion use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat kind of specimens is it best for?\u003c\/strong\u003e\u003cbr\u003eIt is best for routine biological brightfield specimens where 20X and achromatic correction provide clear, color-faithful views.\u003c\/p\u003e","brand":"AmScope","offers":[{"title":"Default Title","offer_id":48612757536987,"sku":"B0197JP5WM","price":137.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71S1E0pMbCL._AC_SL1500.jpg?v=1778463275","url":"https:\/\/gearmusthave.com\/products\/amscope-20x-infinity-achromatic-objective-biological-optics","provider":"GearMustHave","version":"1.0","type":"link"}