{"product_id":"0-74x-reducer-f5-1-m68-triplet-lens-design-astronomical-reducer-dedicated-for-askar-111f-telescope","title":"0.74X Reducer F5.1 M68 Triplet Lens Design Astronomical Reducer Dedicated for ASKAR 111F Telescope","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- The 0.74X reducer brings the 111F's focal ratio down to F5.1, delivering a faster optical system while incorporating built-in field-flattening correction to effectively eliminate field curvature - ensuring sharp and clear stars from the center to the very edges of the frame. The shorter focal ratio provides a wider field of view and shorter exposure times, making it particularly well-suited for capturing expansive nebulae, star clusters, and faint or fast-moving celestial objects.\u003cbr\u003e\u003cbr\u003e- The 111F 0.74X Reducer features a triplet optical design and supports a 44mm full-frame image circle. Its back focus is 55mm (measured from the M48 thread), and both ends feature M68x1 threads for optimal adaptability and stability.\u003cbr\u003e\u003cbr\u003e- The 111F photographic extension tube includes M54x0.75 and M48x0.75 adapters, allowing for direct and convenient connection to the 111F 0.74X reducer. The reducer’s rear adapter ring features a built-in M48x0.75 standard 2-inch filter thread, enabling direct installation of various astronomical filters to accommodate different imaging needs.\u003cbr\u003e\u003cbr\u003e- The entire reducer is precision CNC-machined and comes with front and rear metal threaded caps to protect the optics from dust when not in use.\u003cbr\u003e\u003cb\u003e\u003cbr\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- (After attaching) 111F Focal length: 566mm\u003cbr\u003e- (After attaching) 111F Focal ratio: f\/5.1\u003cbr\u003e- Lens Number: Triplet design\u003cbr\u003e- Back Focus: 55mm (from the base of M48 male thread)\u003cbr\u003e- Weight: 0.5kg\u003cbr\u003e- Rear-end thread type: M68x1\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Reducer\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102229\/102229-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102229\/102229-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102229\/102229-03.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102229\/102229-04.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102229\/102229-05.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products, Audio Amplifer and Decoders","offers":[{"title":"Default Title","offer_id":41029096833073,"sku":"102229","price":303.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0578\/4790\/6353\/files\/1779325744-2.jpg?v=1780389473","url":"https:\/\/www.thanksbuyer.com\/products\/0-74x-reducer-f5-1-m68-triplet-lens-design-astronomical-reducer-dedicated-for-askar-111f-telescope","provider":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products,  Audio Amplifer and Decoders","version":"1.0","type":"link"}