{"product_id":"baader-planetarium-inverter-ring-m48a-female-to-male","title":"Baader Planetarium Inverter ring M48a (female to male)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts M48 Female (Internal) Threads to Male (External)\u003c\/li\u003e\n\u003cli\u003eStandard M48 x 0.75 Filter Thread Pitch\u003c\/li\u003e\n\u003cli\u003eSolves Incompatible Gender Connections in an Optical Train\u003c\/li\u003e\n\u003cli\u003eLow-Profile Design Minimizes Added Back Focus\u003c\/li\u003e\n\u003cli\u003eAlso Serves as a Replacement Part for the Baader FlipMirror II\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eInverter ring M48a (female to male)\u003c\/h2\u003e\n      \u003cp\u003eThe Baader Planetarium M48a Inverter Ring is a fundamental problem-solver that converts a female M48 thread into a male M48 thread, resolving critical connection conflicts in an imaging train. This adapter ensures mechanical compatibility between M48 accessories like filter wheels, off-axis guiders, and correctors that would otherwise be unable to connect due to having the same M48 thread gender.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe M48 Standard: Reversing Thread Gender for Full Compatibility\u003c\/h3\u003e\n      \u003cp\u003eAs you assemble a complex optical train, it's common to encounter a situation where two components both present a female M48 thread, making a direct connection impossible. The M48a Inverter Ring acts as a gender changer, threading into one of the female ports to present a male M48 thread, allowing the two accessories to be securely coupled.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUniversal M48 Fit:\u003c\/strong\u003e Machined to precise M48 x 0.75mm filter thread standards, this ring is compatible with M48 accessories from any manufacturer.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMinimal Optical Path:\u003c\/strong\u003e Its low-profile design is engineered to add the smallest possible length to the optical train, helping you preserve critical back focus distance.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBaader System Component:\u003c\/strong\u003e This ring is included with the Baader FlipMirror II (BFM-II), making it a direct replacement for a lost part or a valuable adapter to have on its own for other applications.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the Baader M48a Inverter Ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader M48a Inverter Ring is a thread adapter, often called a \"gender changer.\" Its sole function is to \u003cstrong\u003econvert a female (internal) M48 thread into a male (external) M48 thread\u003c\/strong\u003e. This allows you to connect two pieces of equipment that both have female M48 threads.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eMy M48 filter wheel has a female thread, and so does my corrector. How does the M48a Inverter Ring fix this?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis is the exact scenario the M48a Inverter Ring is designed for. You simply thread the ring into the female M48 port on either your filter wheel or your corrector. The ring now presents a male M48 thread, allowing you to securely connect the two components and complete your imaging train.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader M48a Inverter Ring compatible with all M48 accessories?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. It is designed to work with the universal \u003cstrong\u003eM48 x 0.75mm thread pitch\u003c\/strong\u003e, which is the standard for 2-inch astronomical filters and many correctors, flatteners, and camera adapters. It will work with M48 accessories from any brand that adheres to this standard.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this M48a Inverter Ring add significant length to my imaging train?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, it is designed to be as low-profile as possible. While it does add a small amount of optical path length, it is typically negligible and unlikely to cause issues with achieving the correct back focus distance for most setups. Its purpose is to solve a mechanical connection problem with minimal optical impact.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI own a Baader FlipMirror II. Do I need to buy this M48a Inverter Ring separately?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, you should not need to. The Baader M48a Inverter Ring is an \u003cstrong\u003eincluded component\u003c\/strong\u003e with the Baader FlipMirror II Star Diagonal (BFM-II). This item is offered separately primarily as a replacement for a lost part or for astronomers who need this specific adapter for other parts of their imaging train.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI am building an imaging train for my refractor with a field flattener. When would I need the M48a Inverter Ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou would need the M48a Inverter Ring if, for example, the telescope-side of your camera has a female M48 thread, and the camera-side of your field flattener *also* has a female M48 thread. This adapter would screw into one of them, converting it to male and allowing the two to connect at the correct spacing.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eConverts M48 Female (Internal) Thread to Male (External)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Standard\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium, Zeiss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e49\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eSame-Thread Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eInverter ring M48a (female to male)\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913155571997,"sku":"BAA-2958555","price":37.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-Inverter-ring-M48a-female-to-male-1_94420f68-73ab-4063-bcec-318da163c43d.jpg?v=1789086847","url":"https:\/\/davidastro.com\/fr\/products\/baader-planetarium-inverter-ring-m48a-female-to-male","provider":"David Astro","version":"1.0","type":"link"}