{"product_id":"3x-focal-extender-1-25-fe03-125","title":"Explore Scientific 3X Focal Extender - 1.25\" - FE03-125","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eAbout the Explore Scientific 3X Focal Extender - 1.25\"...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eAn \u003cb\u003eExplore Scientific Focal Extender\u003c\/b\u003e does exactly what the name implies; it extends the effective focal length of the lens that it is used in conjunction with, thus producing higher magnifications for imaging and visual applications.\u003c\/p\u003e\n\u003cp\u003eFocal extenders are similar to a Barlow or tele-negative lens, but there is one important difference between the two that you will want to take into consideration, especially if you plan to use the \u003cb\u003eExplore Scientific Focal Extender\u003c\/b\u003e for imaging and astro-photography.\u003c\/p\u003e\n\u003cp\u003eWhen you use a standard Barlow or tele-negative lens to increase the magnification of your optical system, your results will be dependent on where you place the Barlow in the optical chain. For instance, if you put a 2X Barlow lens in front of your diagonal instead of behind it (Barlow-Diagonal-Eyepiece as opposed to Diagonal-Barlow-Eyepiece), you won'''t get 2X magnification in both set-ups. The magnification varies with placement. However, with an \u003cb\u003eExplore Scientific Focal Extender\u003c\/b\u003e, even if the distance is changed, the magnification remains the same. You can place your Focal Extender anywhere along the optical chain between an eyepiece or a camera, and if you are supposed to get 2X magnification, you will get 2X magnification.\u003c\/p\u003e\n\u003cp\u003eWhen it comes to imaging, this is a critical difference, because you may want to introduce an accessory like a flip mirror or filter wheel in between the \u003cb\u003eExplore Scientific Focal Extender\u003c\/b\u003e and a CCD camera, which would increase the distance to the focused image. This difference in design allows users to rest easy, whether they are pumping up the magnification of a lower power eyepiece for visual observations or using their Explore Focal Extender in imaging applications.\u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eExplore Scientific 3X Focal Extender - 1.25\" Features...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ci\u003eMore Magnification Choices without Sacrificing Eye Relief:\u003c\/i\u003e A good Focal Extender adds some real versatility to your telescope accessory line-up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a focal extender to increase your magnification, you get to enjoy the generous eye relief of the lower power eyepiece, and that'''s quite a bonus, especially for eyeglass wearers or for those with fast telescopes who can really push high magnification eyepieces. Remember, we make focal extenders in 2X, 3X and 5x models, so there is something for every style of telescope.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eOptimized Optical Design:\u003c\/i\u003e Explore Focal Extenders are optimized through each design, fabrication, and testing process to produce high contrast, high resolution images.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eDurable Coatings \u0026amp; Finishing Touches:\u003c\/i\u003e Each of the four elements in your Explore Scientific Focal Extender is fully multi-coated with EMD enhanced coatings, resulting in bright, sharp images; and every element has blackened edges to reduce internal reflections and increase contrast.\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eTapered Barrel for Extra Security:\u003c\/i\u003e The insert barrel of each extender is double-tapered to allow smooth insertion to, and removal from, a telescope'''s eyepiece holder, focuser or diagonal, however the wide dimension of the taper helps prevent the focal extender from falling out of the telescope should the set-screw holding it in place become loose.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eExplore Scientific 3X Focal Extender - 1.25\" Specifications...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eEquipment Type: Focal Extender\u003c\/p\u003e\n\u003cp\u003eMagnfication Factor: 3X\u003c\/p\u003e\n\u003cp\u003eBarrel Size: 1.25\"\u003c\/p\u003e\n\u003cp\u003eDimensions: L=93mm x W=45mm\u003c\/p\u003e\n\u003cp\u003eWeight: 249 grams; 8.7 oz\u003c\/p\u003e\n\u003cp\u003eExplore Scientific Product Number: FE03-125\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default","offer_id":10552457729,"sku":"EXP-FE03-125","price":107.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/5079-1-thumb.jpeg?v=1776459211","url":"https:\/\/khanscope.com\/en-fr\/products\/3x-focal-extender-1-25-fe03-125","provider":"Khan Scope Centre","version":"1.0","type":"link"}