WebMar 29, 2024 · Image 1. American astronomer George Willis Ritchey and French astronomer Henri Chrétien invented the Ritchey–Chrétien telescope (RCT) in the early 20 th Century. Ritchey actual built the first RCT in 1927. It had a 24-inch mirror. The second RCT was a 40-inch built in 1934 for the Naval Observatory and is currently at their … WebShop telescopes from Guan Sheng Optical, also known as GSO Telescopes, at Agena Astro with free shipping in the US! GSO Telescopes & Accessories Agena Astro …
Focusers Astromart
WebTelescope-Side Thread. Bahtinov Mask Diameter. TPO 3" Crayford Focuser RC OS-CF-LRC. $178.49 $209.99. In Stock ★★★★★3. Orion Bahtinov Mask - 138-173mm ID PinPoint Focusing Mask OR-40008. $42.99. In Stock ★★★★★1. Optec Precision Temperature Probe Kit for FocusLynx OP-19539. WebSep 20, 2024 · Posted 18 October 2024 - 06:56 PM. "TS Optics" are the "Telescope Express" branded GSO R-C scopes, a large & reputable German Astro-dealer...this isn't an uncommon re-branding of GSO equipment who are a Taiwanese firm who have built a good reputation over the last couple of decades with their products. dog friendly pubs county durham
MoonLite Telescope Accessories - focuser
WebShop B&H for our huge inventory of Telescope Focusers from top brands like Alpine Astronomical, JMI Telescopes, Explore Scientific and Celestron. ... Telescope Focusers. 1-30 of 59. Filter by: Brand. Alpine Astronomical 21. Celestron 2. Explore Scientific 7. iOptron 2. JMI Telescopes 22. See all + 4. Savings & Stock. Free Shipping 47; WebSale Price: $54.99 You Save 8% Our Price: $60.00. Buy in monthly payments with Affirm on orders over $50. Learn more. Add to Cart. See shipping choices & costs. More Info. In Stock (1 Available) WebA basic 3 inch Crayford Focuser for Ritchey-Chretian telescopes. The Crayford is a cost effective entry level focuser, well within the price range of most amateur astronomers, and effective for it's cost, as well! It's a great choice for a first focuser to go with your RC Telescope, and we hope that you get a lot of use out of it! faghit annecy