--- product_id: 2632363 title: "EISCO Optical Glass Lens, 3\" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base" brand: "eisco" price: "VT5621" currency: VUV in_stock: true reviews_count: 8 url: https://www.desertcart.vu/products/2632363-eisco-optical-glass-lens-3-75mm-200mm-focal-length-ground store_origin: VU region: Vanuatu --- # Optically Worked Glass 200mm Focal Length 3" Diameter EISCO Optical Glass Lens, 3" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base **Brand:** eisco **Price:** VT5621 **Availability:** ✅ In Stock ## Summary > 🔭 See the World Differently! ## Quick Answers - **What is this?** EISCO Optical Glass Lens, 3" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base by eisco - **How much does it cost?** VT5621 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/2632363-eisco-optical-glass-lens-3-75mm-200mm-focal-length-ground) ## Best For - eisco enthusiasts ## Why This Product - Trusted eisco brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable Design:** Crafted with beveled edges for safety and longevity. - • **Engage and Inspire:** Captivate students with hands-on learning experiences. - • **Perfectly Polished:** Enjoy a highly polished surface for optimal light refraction. - • **Versatile Applications:** Ideal for both classroom demonstrations and creative top spinning. - • **Elevate Your Experiments:** Transform your physics demonstrations with precision optics. ## Overview The EISCO Optical Glass Lens is a 3-inch diameter, double concave lens with a 200mm focal length, designed for educational use in physics classrooms. Made from high-quality, optically worked glass with polished beveled edges, it serves as an excellent tool for light refraction demonstrations and creative top spinning activities. ## Description Full description not available ## Features - DOUBLE CONCAVE || Highly polished, double concave lens - SPHERICAL || Lens measures 3" (75mm) in diameter and approximately 12mm thick - 200MM FOCAL LENGTH || Diverging lens with a 200mm focal length - OPTICALLY WORKED GLASS || Made of high quality, optically worked glass. Highly polished with beveled, ground edges - GREAT FOR PHYSICS CLASSROOMS or TOP SPINNING || This optically true lens is excellent for physics classroom demonstrations in optics and light refraction. It's smooth, concave surface also makes this lens ideal for top spinning ## Product Details - **Material:** Glass - **Brand:** EISCO - **Color:** Transparent - **Product Dimensions:** 3"W x 3"H - **Wide End Diameter:** 3 Inches ## Images ![EISCO Optical Glass Lens, 3" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base - Image 1](https://m.media-amazon.com/images/I/81XT8AFCh6L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great for spinning tops *by K***N on January 15, 2023* I got my nephew a professionally spun and tuned spinning top for Christmas. These lenses were recommended for use as a base on which to spin the top as the gentle concave shape keeps the top towards the center and the glass surface provides a smooth surface with little friction. Using this as a base he was able to spin his top several times that night for 4 to 5 minutes and it spun so perfectly it would often hardly look like it was even spinning. ### ⭐⭐⭐⭐⭐ Well made and impressive *by C***G on November 6, 2016* I got this on a whim for some spinning tops and a cotton supported spindle. It works well for the tops, but I think I need more practice for the spindle. It's been a cool item to interest my grandkids with the optical effects. The lens is very well done with clean smooth edges. I have used it at work to clarify engineering drawings after I noticed the lens making some parts of the drawing clearer even though it was making it smaller; counter intuitive but handy. ### ⭐⭐⭐⭐ Excellent surface for spinning Pocket/Precision tops *by E***N on March 17, 2015* I have numerous precision tops (AKA Pocket tops, Spinning tops) by various makers from 5/8" to 2.1" in diameter. This type of surface is ideal for many styles except for flat-bottom-tops with a shallow clearance for bearings in tops that are greater than 1.2" in the realm of beginning collectors (as made by people like Twisted Tops, Fludunlimited/BW Flud, Charles Symeonides, and Patrick Ober). The concavity tends to interfere with larger tops with that particular diameter/design. For intermediate/advanced top collectors, this lens should be suitable for your use.This lens works well for tops with stainless, ruby, or ceramic genre of bearings. It also even works well with tops that do not have bearings such as the Inception top, Tippe top, Lance Barnett tops (some select tops that don't have bearings), or Franz Tommasi Delrin/Polymer tops.My lens did have a tiny chip on the edge of the lens but since my purposes were not for optical use, I didn't return it. However, it raises the questions of quality control for my experience.Overall, I am quite pleased with the performance of smaller tops with a wide basilar clearance for my tops, especially from makers such as Blake San (Mountain Tops EDC), Steven Robbins Fine Pocket Tops, the Inception top, Symeon Metal Works, the Tippe/Tippie Top, Twisted Tops, Marke Dalpe, and Fludunlimited/BW Flud. ## Frequently Bought Together - EISCO Optical Glass Lens, 3" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base - ForeverSpin Stainless Steel(Brush-Finish) Spinning Top - World Famous Spinning Tops --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/2632363-eisco-optical-glass-lens-3-75mm-200mm-focal-length-ground](https://www.desertcart.vu/products/2632363-eisco-optical-glass-lens-3-75mm-200mm-focal-length-ground) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-19*