---
product_id: 72696793
title: "Alstar f/6.3 Focal Reducer & Field Corrector or C Series SC Telescopes | Reduces Focal Length & Ratio 37%, f/10 to f/6.3, Deep-Sky Observing & Astroimaging, Works with Schmidt-Cassegrain Telescopes"
brand: "alstar"
price: "$167.83"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/72696793-alstar-f-6-3-focal-reducer-and-field-corrector-c
store_origin: US
region: United States of America
---

# 37% focal length reduction 41mm clear aperture f/10 to f/6.3 Alstar f/6.3 Focal Reducer & Field Corrector or C Series SC Telescopes | Reduces Focal Length & Ratio 37%, f/10 to f/6.3, Deep-Sky Observing & Astroimaging, Works with Schmidt-Cassegrain Telescopes

**Brand:** alstar
**Price:** $167.83
**Availability:** ✅ In Stock

## Summary

> 🌠 Unlock the Universe: Experience the cosmos like never before!

## Quick Answers

- **What is this?** Alstar f/6.3 Focal Reducer & Field Corrector or C Series SC Telescopes | Reduces Focal Length & Ratio 37%, f/10 to f/6.3, Deep-Sky Observing & Astroimaging, Works with Schmidt-Cassegrain Telescopes by alstar
- **How much does it cost?** $167.83 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/72696793-alstar-f-6-3-focal-reducer-and-field-corrector-c)

## Best For

- alstar enthusiasts

## Why This Product

- Trusted alstar brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Transform Your View:** Convert your f/10 optical system to a faster f/6.3 for an expansive field of view.
- • **Precision Engineering:** Four-element, fully multi-coated optical design ensures stunning image clarity.
- • **Versatile Compatibility:** Works seamlessly with Celestron's 5 to 14 inch Schmidt Cassegrain telescopes.
- • **Dual Focal Ratio Flexibility:** Enjoy the benefits of a dual focal ratio instrument without compromising on quality.
- • **Enhanced Stargazing Experience:** Elevate your astrophotography and stargazing adventures with this essential accessory.

## Overview

The ALSTARAlstar f/6.3 Reducer Corrector is a high-performance accessory designed for Celestron Schmidt Cassegrain telescopes, converting f/10 systems to f/6.3 for a wider field of view. With a 37% reduction in effective focal length and a fully multi-coated optical design featuring a 41mm clear aperture, this reducer corrector enhances image quality while providing dual focal ratio capabilities.

## Description

Alstar f/6.3 Reducer Corrector for C Series Telescopes

## 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

## 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 Focal Reducer & Field Corrector or C Series SC Telescopes | Reduces Focal Length & Ratio 37%, f/10 to f/6.3, Deep-Sky Observing & Astroimaging, Works with Schmidt-Cassegrain Telescopes - Image 1](https://m.media-amazon.com/images/I/71GWo5DCsLL.jpg)

## 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

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**Shop now:** [https://www.desertcart.us/products/72696793-alstar-f-6-3-focal-reducer-and-field-corrector-c](https://www.desertcart.us/products/72696793-alstar-f-6-3-focal-reducer-and-field-corrector-c)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-04*