--- product_id: 489347540 title: "Alstar f/6.3 Reducer Corrector for C Series Telescopes | F/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Deep-Sky Observe&Astroimaging, Works with C Series Telescope" brand: "a alstar" price: "€ 171.36" currency: EUR in_stock: true reviews_count: 1 category: "A Alstar" url: https://www.desertcart.gr/products/489347540-alstar-f-6-3-reducer-corrector-for-c-series-telescopes store_origin: GR region: Greece --- # f/10 to f/6.3 faster optics 4-element multi-coated lens 37% focal length reduction Alstar f/6.3 Reducer Corrector for C Series Telescopes | F/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Deep-Sky Observe&Astroimaging, Works with C Series Telescope **Brand:** a alstar **Price:** € 171.36 **Availability:** ✅ In Stock ## Summary > 🌠 Unlock the universe faster and wider—because every star deserves a spotlight! ## Quick Answers - **What is this?** Alstar f/6.3 Reducer Corrector for C Series Telescopes | F/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Deep-Sky Observe&Astroimaging, Works with C Series Telescope by a alstar - **How much does it cost?** € 171.36 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/489347540-alstar-f-6-3-reducer-corrector-for-c-series-telescopes) ## Best For - a alstar enthusiasts ## Why This Product - Trusted a alstar brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Compatibility:** Seamlessly fits all major Celestron Schmidt-Cassegrain models from 5" to 14". - • **Expand Your Cosmic Canvas:** Transforms your f/10 telescope to a blazing f/6.3 for ultra-wide deep-sky views. - • **Dual Focal Ratio Flexibility:** Switch between classic and fast focal ratios effortlessly—maximize your observing potential. - • **Sharper Images, Faster Shots:** Reduces exposure time by 3x, perfect for crisp astrophotography without the wait. - • **Premium Optics, No Compromise:** Four-element, fully multi-coated 41mm aperture ensures crystal-clear, distortion-free images. ## Overview The Alstar f/6.3 Reducer Corrector is a precision optical accessory designed to convert Celestron Schmidt-Cassegrain telescopes from f/10 to a faster f/6.3 focal ratio, reducing focal length by 37%. Featuring a four-element, fully multi-coated 41mm aperture lens, it delivers wider fields of view and sharper images, ideal for deep-sky observing and astrophotography. Compatible with all major Celestron C-series models (5" to 14"), it enables dual focal ratio use without sacrificing image quality, cutting exposure times by up to three times. ## Description This combination focal reducer and field corrector lens accessory works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer/Corrector is f/6.3 for C5, C6, C8, C9¼ and C11 telescopes and f/7 for the C14 telescope.If offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3. Review: Attaches easily well designed - A must have to flatten your field with a dslr ## Features - Converts f/10 optical system to faster f/6.3 for a significantly wider field of view - Reducer shortens the effective focal length of Schmidt Cassegrain telescope optical system by 37 percent - This combination focal reducer and field corrector lens accessory works with all Celestron 5 inch; 6 inch; 8 inch; 9 1/4 inch; 11 inch and 14 inch Schmidt Cassegrain telescopes - Four element; fully multi coated optical design with 41 mm clear aperture - This clever accessory makes it possible to have a dual focal ratio instrument; without sacrificing image quality ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B077GQ3JLX | | Additional Features | Converts f/10 to f/6.3 for wider field of view, reduces focal length by 37%, enables dual focal ratio use | | Best Sellers Rank | #123,187 in Electronics ( See Top 100 in Electronics ) #16 in Telescope Reflectors | | Brand | A ALSTAR | | Built-In Media | reducer | | Coating | Multi-Coated | | Compatible Devices | C5, C6, C8, C9.25, C11, C14 | | Customer Reviews | 5.0 out of 5 stars 4 Reviews | | Exit Pupil Diameter | 6.51 Millimeters | | Eye Piece Lens Description | Plössl | | Eye piece lens description | Plössl | | Field Of View | 0.63 Degrees | | Finderscope | Reflex | | Focal Length Description | Reduced focal length by 37% | | Focus Type | Manual Focus | | Item Dimensions D x W x H | 6.1D x 7.4W x 8.4H centimeters | | Item Weight | 4.8 Ounces | | Manufacturer | Alstar | | Manufacturer Part Number | 6971336221282 | | Model Name | Alstar | | Model Number | SKU_AM_RC63A | | Model name | Alstar | | Mount | Altazimuth Mount | | Objective Lens Diameter | 41 Millimeters | | Objective lens diameter | 41 Millimeters | | Power Source | Manual Operation | | Product dimensions | 6.1D x 7.4W x 8.4H centimeters | | Telescope mount description | Altazimuth Mount | | Unit Count | 1.0 Count | | Zoom Ratio | 1:1 | ## Product Details - **Brand:** A ALSTAR - **Objective Lens Diameter:** 41 Millimeters - **Telescope Mount Description:** Equatorial Mount - **Product Dimensions:** 2.4"D x 2.9"W x 3.3"H - **Focus Type:** Manual Focus - **Power Source:** Manual Operation - **Finderscope:** Reflex - **Item Weight:** 4.8 Ounces - **Compatible Devices:** C5, C6, C8, C9.25, C11, C14 - **Lens Coating Description:** Fully Multi-Coated ## Images ![Alstar f/6.3 Reducer Corrector for C Series Telescopes | F/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Deep-Sky Observe&Astroimaging, Works with C Series Telescope - Image 1](https://m.media-amazon.com/images/I/71GWo5DCsLL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Attaches easily well designed *by P***. on 4 January 2026* A must have to flatten your field with a dslr ## Frequently Bought Together - Alstar f/6.3 Reducer Corrector for C Series Telescopes - Celestron 93633-A SLR or DSLR T-Adapter (C5, 6, 8, 9.25, 11, 14), Black - SVBONY SV226 Telescope Filter Drawer, Photographic Filters Drawer with M42-M48 Adapter, Double Magnetic Filter Holder for 1.25 and 2 Inches Filter Mounted, for Deep Sky Photography --- ## 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.gr/products/489347540-alstar-f-6-3-reducer-corrector-for-c-series-telescopes](https://www.desertcart.gr/products/489347540-alstar-f-6-3-reducer-corrector-for-c-series-telescopes) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-19*