{"product_id":"takahashi-fs-60c-fluorite-apochromat-and-reducer-f-6-f-s","title":"Takahashi FS-60C Fluorite Apochromat and Reducer F\/6 F*S","description":"\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0568\/5444\/6280\/files\/free_shipping10_480x480.jpg?v=1663020212\"\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eThis is a vintage Takahashi FS-60C Fluorite Apochromat and Reducer F\/6 (discontinued), I am the original owner and I \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003epurchased it as part of a collection in the late 1990s, the FS-60C is a 60 mm refractor that employs a multi-coated, two element fluorite objective lens with a prime focal length of 355 mm. With the FS.78 F6 reducer, the FS-60C is converted to an f\/4.2 instrument.  The combination results in a 40 mm diameter image circle with 60% illumination across the entire field.  Illumination is maintained at 95% or more out to a 25 mm diameter, and is 72% illuminated out to a diameter of 35 mm. \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eI used this as a DIMM mounted it to a Finger Lakes CFW-2 filter wheel and camera and it saw thousands of hours of night sky. Its in very good condition, with just a few spots on the objective that are barely naked eye visible and I couldn't capture with a camera.  You will need to buy from Takahashi, or make an adaptor if you want to use  with an eyepiece.  Included is the \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eOptical Tube Assembly, tube holder, FS.78 F6 reducer \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eand the adapter I used in the DIMM.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eFluorite doublet apochromat \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAir-spaced doublet. Fluorite on the front\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eHard multi-coatings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eObjective lens diameter: 60mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eFocal length: 355mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eFocal ratio: f\/5.9\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eMetal back distance: 162mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eOptical tube length: 440mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eOptical tube diameter: 80mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDew shield OD: 80mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eWeight: 1.4kg (3.08 lbs)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eOutput thread: M56\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":45107285393608,"sku":null,"price":899.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0568\/5444\/6280\/files\/PXL_20260603_005834522_2_9b775ab4-ec7c-4a78-805d-72cc887487eb.jpg?v=1780451763","url":"https:\/\/reticulum.online\/products\/takahashi-fs-60c-fluorite-apochromat-and-reducer-f-6-f-s","provider":"Reticulum","version":"1.0","type":"link"}