--- product_id: 440410 title: "Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects" brand: "celestron" price: "€ 299.88" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.gr/products/440410-celestron-f-6-3-reducer-corrector-lens-for-schmidt-cassegrain store_origin: GR region: Greece --- # f/6.3 faster exposure ratio wider field of view 37% focal length reduction Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects **Brand:** celestron **Price:** € 299.88 **Availability:** βœ… In Stock ## Summary > πŸ”­ Unlock the universe faster β€” double your telescope’s versatility! ## Quick Answers - **What is this?** Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects by celestron - **How much does it cost?** € 299.88 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/440410-celestron-f-6-3-reducer-corrector-lens-for-schmidt-cassegrain) ## Best For - celestron enthusiasts ## Why This Product - Trusted celestron brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Speed Up Your Shots:** Cut exposure times with a blazing f/6.3 focal ratio. - β€’ **Dual Telescope Power:** Transform your SCT from planetary to deep-sky in seconds. - β€’ **Maximized Light Transmission:** Fully multi-coated lens for crisp, bright images even in low light. - β€’ **Seamless Accessory Compatibility:** Works flawlessly with all your SCT add-ons. - β€’ **Built to Last & Backed by Experts:** Premium machined aluminum housing with 2-year US warranty. ## Overview The Celestron f/6.3 Reducer-Corrector Lens is a precision accessory designed for Schmidt-Cassegrain telescopes that reduces focal length and f-ratio by 37%, enabling faster exposure times and a wider field of view. Ideal for both deep-sky astrophotography and terrestrial digiscoping, it maintains full compatibility with existing accessories and features a fully multi-coated lens housed in durable machined aluminum. Backed by a 2-year US warranty and expert support, it’s the essential upgrade for serious SCT users seeking versatility and performance. ## Description Imagine having two telescopes in one β€” a long focal length instrument for lunar and planetary work and a short focal length scope for deep sky observing and astrophotography. With the Celestron Reducer/Corrector Lens, that’s precisely what you get. Explicitly designed for Celestron Schmidt-Cassegrain telescopes, this unique lens reduces your telescope’s focal length and f/ ratio by 37%, turning your long focal length telescope into a fast, short focal length instrument. A f/10 focal ratio now achieves a f/6.3, while an f/11 focal ratio now achieves a f/7. For visual use, this means you get lower power with the same eyepiece and a wider field of view. Photographically you also get a wider field and much shorter exposures. The Reducer/Corrector is easy to install by threading the unit onto the rear cell of your Schmidt-Cassegrain telescope (or the reducer plate of the C11 and C14). Once installed, you can add additional accessories like T-Adapters, 1.25” Visual Back, Star Diagonal, or Off-Axis Guider. The Reducer/Corrector can also be used for terrestrial digiscoping. The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject. This fully multi-coated lens provides maximum light transmission with near full-field illumination. The lens is housed in machined aluminum for are machined aluminum black anodized. The internal surfaces are blackened and glare-threaded to provide the highest contrast. The lens has a knurled surface, providing a tremendous gripping surface for threading/unthreading. ## Features - LIKE HAVING TWO TELESCOPES IN ONE: Your long focal length Schmidt-Cassegrain is well suited to lunar and planetary work. Add the Reducer Corrector and you have a short focal length telescope perfect for deep sky observing and astrophotography. - REDUCES FOCAL LENGTH AND F/RATIO BY 37%: Simply thread the reducer onto your telescopes rear cell and an f/10 Schmidt-Cassegrain becomes f/6.3. An f/11 instrument becomes f/7. - COMPATIBLE WITH ALL YOUR ACCESSORIES: Once the reducer is installed, you can add accessories like a T-Adapter, visual back, star diagonal or off-axis guider as usual. - GREAT FOR TERRESTRIAL DIGISCOPING: The faster f/ratio allows you to shoot in dimmer lighting conditions and still properly expose your subject. This fully multi-coated lens provides maximum light transmission with near full-field illumination. - UNBEATABLE WARRANTY & SUPPORT: Buy with confidence from Celestron, a leading telescope brand in California since 1960. Your purchase includes a 2-Year US Warranty and unlimited support from our team of US-based experts. ## Technical Specifications | Specification | Value | |---------------|-------| | Additional Features | Dual Focal Length Functionality | | Asin | B00009XVHZ | | Best Sellers Rank | #10 in Telescope Reflectors #112 in Telescope & Microscope Accessories | | Brand | Celestron | | Built In Media | Reducer - Corrector | | Coating | Fully Multi-Coated | | Compatible Devices | Celestron Schmidt-Cassegrain telescopes (C5, C6, C8, C9.25, C11, C14) | | Customer Reviews | 4.7 4.7 out of 5 stars (724) 4.7 out of 5 stars | | Exit Pupil Diameter | 31.75 millimeters | | Eye Piece Lens Description | Plossl | | Field Of View | 0.04 degrees | | Finderscope | Reflex | | Focal Length Description | The original focal length of the telescope, before using the reducer corrector, is not explicitly mentioned in the provided information. However, it can be inferred that for an f/10 system, the reducer corrector reduces the focal length by 37% to make it an f/6.3 system. Thus, if the focal length of the f/10 system is F, then the focal length after using the reducer corrector would be 0.63F (f/6.3). So, the original focal length of the telescope is F = 0.63F / 0.63 β‰ˆ 1 focal length unit (FL), given that 1 FL is the focal length of the system after reduction. | | Focus Type | Manual Focus | | Global Trade Identification Number | 00050234941754 | | Item Dimensions D X W X H | 2"D x 2"W x 2"H | | Item Weight | 150 g | | Manufacturer | Celestron | | Manufacturer Part Number | 94175 | | Model Name | Celestron f/6.3 Reducer/Corrector | | Model Number | 94175 | | Mount | Equatorial Mount | | Number Of Items | 1 | | Objective Lens Diameter | 20 centimeters | | Optical Tube Length | 10.5 centimeters | | Power Source | Not Obtainable | | Unit Count | 1 Count | | Upc | 050234941754 | | Warranty Description | 2-YEAR WARRANTY | | Zoom Ratio | 7 | ## Product Details - **Brand:** Celestron - **Eye Piece Lens Description:** Plossl - **Finderscope:** Reflex - **Focus Type:** Manual Focus - **Model Name:** Celestron f/6.3 Reducer/Corrector - **Objective Lens Diameter:** 20 centimeters - **Optical Tube Length:** 10.5 centimeters - **Power Source:** Not Obtainable - **Product Dimensions:** 2"D x 2"W x 2"H - **Telescope Mount Description:** Equatorial Mount ## Images ![Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects - Image 1](https://m.media-amazon.com/images/I/519X+yzPqPL.jpg) ![Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects - Image 2](https://m.media-amazon.com/images/I/5165OQE0RRL.jpg) ![Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects - Image 3](https://m.media-amazon.com/images/I/21xqFBUfSjL.jpg) ![Celestron f/6.3 Reducer-Corrector Lens for Schmidt-Cassegrain Telescopes | f/6.3 Focal Reducer, Faster Exposure Times, Wider Field of View, Must-Have SCT Astroimaging Accessory for Deep-Sky Objects - Image 4](https://m.media-amazon.com/images/I/51lE9ezskBL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Useful piece for telescope and camera *by on Reviewed in the United States July 20, 2026* Using with a Celestron 8SE telescope and Nikon D5300 (with attachment) to "zoom out" a little when taking pictures of the moon and sun (with solar filter) instead of getting parts of it, it zooms out just enough to get the whole into the frame. Simple to attach to the telescope and then clip the camera on. Has a reasonable amount of weight to it, not too heavy but feels like a quality piece.As with all photography equipment if you can get it on sale the better value it will be. ### ⭐⭐⭐⭐⭐ I use this often. works great! *by on Reviewed in the United States March 27, 2026* I use this often. works great! ### ⭐⭐⭐⭐⭐ Visual or Video -A Great Accessory *by on Reviewed in the United States October 24, 2011* I am sorry that I did not buy this accessory two years ago. It all began with a used Celestron C5. Then I bought a very nice used Nexstar 8SE and thought wow, I should have done this go-to thing sooner. After a year or so, I moved up to a new Celestron CPC925 and decided to explore video astronomy with an inexpensive Samsung SBC-2000 security cam. Most SCTs have a focal ratio of about f/10 (focal length divided by aperture) but a camera works better with a faster (shorter focal length) scope. The usual way to do that with a video camera is to screw on a small .5x reducer. So I bought on of those for $35 and was just amazed at the detail and colors in the Dumbbell Nebula. Then someone over at Cloudynights.com suggested that try adding a f/6.3 reducer (stacking reducers). So I bought the f/6.3, screwed in on the back of the CPC925, replaced the visual back and diagonal, mounted the camera (without the .5x) and stayed up until 2AM looking at the Orion Nebula. Before heading for bed, I pulled the camera, put in a 20MM 68 degree APOV eyepiece, and had another "Wow!" moment.The Celestron f/6.3 reducer-corrector really brightens the image, widens the field of view, improves contrast and detail, and flattens the image improving the look of stars near the edge of the field of view. Many people leave them on all of the time except when looking at the moon and planets or other high magnification situation.There are other and cheaper reducers on the market and they do work. However not all of them offer the same degree of improvement at the edge of the field of view. Rod Mollise writes "...6.3 r/cs are one of the best--if not the best--SCT accessories to ever come down the pike" and "I'll put it this way...the 6.3 rarely comes off the rear cell of the C8." ## Frequently Bought Together - Celestron – Focal Reducer & Field Corrector Imaging Accessory – Reduces Focal Length & Ratio 37% – f/10 to f/6.3 – Ideal for Deep-Sky Observing & Astroimaging – Works w/Schmidt-Cassegrain Telescopes - Celestron 93633-A SLR or DSLR T-Adapter (C5, 6, 8, 9.25, 11, 14), Black - Celestron 93419 T-Ring Adapter for Canon EOS Digital Cameras, Black --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/440410-celestron-f-6-3-reducer-corrector-lens-for-schmidt-cassegrain](https://www.desertcart.gr/products/440410-celestron-f-6-3-reducer-corrector-lens-for-schmidt-cassegrain) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-15*