{"title":"M48 adapters","description":"\u003cp\u003eM48 Accessory Adapters\u003c\/p\u003e\n\u003c!----\u003e","products":[{"product_id":"artesky-prolunga-m48-9mm","title":"M48 Extension Tube Artesky 9mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 9mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust the back focus in the optical train.\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eIt is fitted between two M48-threaded components (filter wheel, focal reducer, camera) to add exactly 9mm of distance, achieving the back focus required by the optics.\u003c\/p\u003e\n\n\u003ch2\u003eWho it's for\u003c\/h2\u003e\n\u003cp\u003eEssential for astrophotographers who need to fine-tune the sensor-to-optics distance, especially with reducers or field flatteners that require a specific back 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mm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBrand\u003c\/td\u003e\u003ctd\u003eArtesky\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Artesky","offers":[{"title":"Default Title","offer_id":51260734406987,"sku":"AKM483","price":18.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-m48-3mm-artesky.jpg?v=1756460679"},{"product_id":"artesky-prolunga-m48-5mm","title":"M48 Extension Tube Artesky 5mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 5mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust the back focus in the optical train.\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eIt is fitted between two M48-threaded components (filter wheel, focal reducer, camera) to add exactly 5mm of distance, achieving the back focus required by the 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Title","offer_id":51260734538059,"sku":"AKM485","price":18.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-m48-5mm-artesky.jpg?v=1756460678"},{"product_id":"artesky-prolunga-m48-10mm","title":"M48 Extension Tube Artesky 10mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 10mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust the back focus in the optical train.\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eIt is fitted between two M48-threaded components (filter wheel, focal reducer, camera) to add exactly 10mm of distance, achieving the back focus required by the optics.\u003c\/p\u003e\n\n\u003ch2\u003eWho it's for\u003c\/h2\u003e\n\u003cp\u003eEssential for astrophotographers who need to fine-tune the sensor-to-optics distance, especially with reducers or field flatteners that require a specific back focus.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eThread\u003c\/td\u003e\u003ctd\u003eM48x0.75 male\/female\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eLength\u003c\/td\u003e\u003ctd\u003e10 mm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBrand\u003c\/td\u003e\u003ctd\u003eArtesky\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Artesky","offers":[{"title":"Default Title","offer_id":51260734701899,"sku":"AKM4810","price":18.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-m48-10mm-artesky.jpg?v=1756460677"},{"product_id":"artesky-prolunga-m48-15mm","title":"M48 Extension Tube Artesky 15mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 15mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust 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mm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBrand\u003c\/td\u003e\u003ctd\u003eArtesky\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Artesky","offers":[{"title":"Default Title","offer_id":51260734767435,"sku":"AKM4815","price":18.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-m48-15mm-artesky.jpg?v=1756460677"},{"product_id":"artesky-prolunga-m48-25mm","title":"M48 Extension Tube Artesky 25mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 25mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust the back focus in the optical train.\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eIt is fitted between two M48-threaded components (filter wheel, focal reducer, camera) to add exactly 25mm of distance, achieving the back focus required by the 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Title","offer_id":51260735062347,"sku":"AKM4825","price":20.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-m48-25mm-artesky.jpg?v=1756460676"},{"product_id":"artesky-prolunga-m48-30mm","title":"M48 Extension Tube Artesky 30mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 30mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust the back focus in the optical train.\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eIt is fitted between two M48-threaded components (filter wheel, focal reducer, camera) to add exactly 30mm of distance, achieving the back focus required by the optics.\u003c\/p\u003e\n\n\u003ch2\u003eWho it's for\u003c\/h2\u003e\n\u003cp\u003eEssential for astrophotographers who need to fine-tune the sensor-to-optics distance, especially with reducers or field flatteners that require a specific back 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At 47mm in length, it allows reaching focus in configurations with large backfocus requirements, such as SCT and Cassegrain telescopes and refractors with focal reducers.\u003c\/p\u003e\u003cp\u003eCompatible with all Baader ClickLock 2\" connections and accessories. 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Thickness: 2mm","brand":"ZWO","offers":[{"title":"Default Title","offer_id":51261235134795,"sku":"ZWZWO-M54M-M48F-2","price":14.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/zwo-adattatore-m54-m48-ruote-portafiltri-efw-cassetto-portafiltro.jpg?v=1744223398"},{"product_id":"artesky-prolunga-m48-20mm","title":"M48 Extension Tube Artesky 20mm","description":"\u003cp\u003e\u003cstrong\u003eThe Artesky M48 extension tube 20mm\u003c\/strong\u003e is a spacer ring with M48x0.75 male\/female thread, used to adjust the back focus in the optical train.\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eIt is fitted between two M48-threaded components (filter wheel, focal reducer, camera) to add exactly 20mm of distance, achieving the back focus required by the optics.\u003c\/p\u003e\n\n\u003ch2\u003eWho it's for\u003c\/h2\u003e\n\u003cp\u003eEssential for astrophotographers who need to fine-tune the sensor-to-optics distance, especially with reducers or field flatteners that require a specific back focus.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eThread\u003c\/td\u003e\u003ctd\u003eM48x0.75 male\/female\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eLength\u003c\/td\u003e\u003ctd\u003e20 mm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBrand\u003c\/td\u003e\u003ctd\u003eArtesky\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Artesky","offers":[{"title":"Default Title","offer_id":51261441147211,"sku":"AKM4820","price":18.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/anello_prolunga_artesky_m48x0.75_20mm.jpg?v=1744221142"},{"product_id":"ts-optics-prolunga-m48-3mm-backfocus-spaziatore","title":"TS-Optics 3mm Extension with M48 - 2\" Filter Thread and 2\" Diameter","description":"\u003ch2\u003eM48 Extension Ring 3mm for Precise Backfocus Adjustment\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eTS-Optics M48 3mm extension ring\u003c\/strong\u003e is a \u003cstrong\u003ethreaded spacer\u003c\/strong\u003e designed to precisely adjust the \u003cstrong\u003ebackfocus distance\u003c\/strong\u003e between astronomical accessories. It is ideal for positioning components at the correct spacing, such as a \u003cstrong\u003ecamera\u003c\/strong\u003e in relation to a \u003cstrong\u003ereducer\u003c\/strong\u003e or other accessories using a standard \u003cstrong\u003eM48 thread\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eM48 Male\/Female Thread Connection\u003c\/h2\u003e\n\u003cp\u003eThe extension ring features a \u003cstrong\u003edual M48 thread\u003c\/strong\u003e, with \u003cstrong\u003efemale threading on one side\u003c\/strong\u003e and \u003cstrong\u003emale threading on the other\u003c\/strong\u003e. This allows seamless integration into an optical train using M48 connections. By combining multiple M48 extension rings, it is possible to achieve a \u003cstrong\u003eprecise and predetermined spacing\u003c\/strong\u003e, which is particularly useful in astrophotography setups.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTelescope side thread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM48 female (internal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCamera side thread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM48 male (external)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TS-Optics","offers":[{"title":"Default Title","offer_id":51261582573899,"sku":"TSTSVF203","price":29.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-filetto-m48-3mm-ts-optics-telescopio-accessorio.jpg?v=1744220624"},{"product_id":"ts-optics-5mm-prolunga-filettata-m48","title":"TS-Optics 5mm Extension with M48 - 2\" Filter Thread and 2\" Diameter","description":"\u003cp\u003e\u003cstrong\u003eThe extension tube extends an adapter with M48x0.75 thread by 5 mm.\u003cbr \/\u003e\u003cbr \/\u003e\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003ebarrel made of metal\u003c\/li\u003e \u003cli\u003eblack anodized\u003c\/li\u003e \u003cli\u003edouble sided 2\" filter thread (M48x0.75) - male\/female\u003c\/li\u003e \u003cli\u003eoptical path is 5 mm\u003c\/li\u003e \u003cli\u003ethe outer diameter of the adapter is is exactly 2\" - fits into the 2\" receptacle of focusers or adapters\u003c\/li\u003e \u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cp\u003e\u003cspan\u003eThis adaptation has proven itself in many areas of astronomy. The extension tube is simply screwed into the M48 filter thread from 2\" eyepieces or 2\" adapters and therefore will extend the barrel. Thus the fitting accuracy of an adapter can be improved.\u003c\/span\u003e\u003cbr \/\u003e\u003cbr \/\u003e\u003cspan\u003eThese tube is also important for astrophotography when the correct distance between corrector and camera sensor is concerned. Here, often just a few millimetres are critical.\u003c\/span\u003e\u003c\/p\u003e \u003ctable cellpadding=\"4\"\u003e \u003ctbody\u003e \u003ctr class=\"bgltblue\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003eBarrel made of metal\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"stpage-bg\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003eblack anodized\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"bgltblue\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eThread\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003edouble sided 2\" filter thread (M48x0.75) - female\/male\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"stpage-bg\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eLength\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003e5 mm without the male thread\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e","brand":"TS-Optics","offers":[{"title":"Default Title","offer_id":51261584310603,"sku":"TSTSVF205","price":29.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/ts-optics-prolunga-5mm-filetto-m48-accessorio-astrofotografia.jpg?v=1744220613"},{"product_id":"ts-optics-prolunga-m48-30mm-filetto-filtro-2-pollici","title":"TS-Optics 30mm Extension with M48 - 2\" Filter Thread and 2\" Diameter","description":"\u003ch2\u003eM48 Extension Tube 30 mm with 2\" Filter Thread\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eTS-Optics M48 extension tube 30 mm\u003c\/strong\u003e is a \u003cstrong\u003e2\" filter thread extension (M48x0.75)\u003c\/strong\u003e designed to precisely increase the distance between astronomical accessories. This adapter extends a connection with \u003cstrong\u003eM48 thread\u003c\/strong\u003e by \u003cstrong\u003e30 mm\u003c\/strong\u003e, allowing accurate spacing adjustment within an optical setup.\u003c\/p\u003e\n\n\u003ch2\u003eDouble M48 male \/ female thread\u003c\/h2\u003e\n\u003cp\u003eThe adapter features a \u003cstrong\u003edouble-sided M48x0.75 thread\u003c\/strong\u003e, with a \u003cstrong\u003efemale thread on one side\u003c\/strong\u003e and a \u003cstrong\u003emale thread on the other\u003c\/strong\u003e. It can be screwed directly into the \u003cstrong\u003eM48 filter thread of 2\" eyepieces\u003c\/strong\u003e or \u003cstrong\u003e2\" adapters\u003c\/strong\u003e, extending the barrel and improving the fitting accuracy between accessories.\u003c\/p\u003e\n\n\u003ch2\u003eUseful for observation and astrophotography\u003c\/h2\u003e\n\u003cp\u003eThis type of extension is widely used in many areas of astronomy. The M48 extension allows precise adjustment of the distance between optical accessories and helps achieve the correct spacing required by the optical system.\u003c\/p\u003e\n\n\u003cp\u003eIn \u003cstrong\u003eastrophotography\u003c\/strong\u003e, maintaining the correct distance between an optical corrector and the camera sensor is essential. Even a few millimetres can affect optical performance, and the \u003cstrong\u003e30 mm M48 extension\u003c\/strong\u003e helps achieve the required spacing with precision.\u003c\/p\u003e\n\n\u003ch2\u003eSolid metal construction\u003c\/h2\u003e\n\u003cp\u003eThe extension tube features a \u003cstrong\u003emetal barrel with black anodized finish\u003c\/strong\u003e, ensuring mechanical strength and helping to reduce unwanted reflections inside the optical path.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDouble-sided 2\" filter thread M48x0.75 (female\/male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOptical length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOuter diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TS-Optics","offers":[{"title":"Default Title","offer_id":51261586080075,"sku":"TSTSVF230","price":29.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-filettata-M48-30mm-filetto-maschio-femmina-TS-Optics.jpg?v=1744220603"},{"product_id":"ts-optics-10mm-prolunga-filettata-m48","title":"TS-Optics 10mm Extension with M48 - 2\" Filter Thread and 2\" Diameter","description":"\u003cdiv\u003e\n  \u003ch2\u003eM48 Extension Tube – Length 10 mm\u003c\/h2\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eM48 extension tube\u003c\/strong\u003e with a \u003cstrong\u003e10 mm length\u003c\/strong\u003e is an essential accessory for \u003cstrong\u003eprecise backfocus adjustment\u003c\/strong\u003e in astrophotography setups. Featuring a \u003cstrong\u003efemale M48 thread (internal)\u003c\/strong\u003e on one side and a \u003cstrong\u003emale M48 thread (external)\u003c\/strong\u003e on the other, it allows you to set the correct spacing between cameras, filters, or reducers and your telescope.\u003c\/p\u003e\n\n  \u003cp\u003eMade of \u003cstrong\u003eblack anodized aluminum\u003c\/strong\u003e, it provides durability and minimizes internal reflections. Multiple extension rings can be combined to achieve the exact spacing required for your optical system.\u003c\/p\u003e\n\n  \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTelescope side thread: \u003cstrong\u003eM48 female (internal)\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003eCamera side thread: \u003cstrong\u003eM48 male (external)\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003eLength: \u003cstrong\u003e10 mm\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003eMaterial: \u003cstrong\u003eblack anodized aluminum\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003eCompatible with all \u003cstrong\u003estandard M48 accessories\u003c\/strong\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003ePerfect for achieving proper spacing with reducers, flatteners, and CCD\/CMOS cameras. A simple yet \u003cstrong\u003ecritical component for sharp, focused astro-images\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"TS-Optics","offers":[{"title":"Default Title","offer_id":51261588341067,"sku":"TSTSVF210","price":29.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/ts-optics-prolunga-10mm-filetto-m48-accessorio-telescopico.jpg?v=1744220594"},{"product_id":"ts-optics-15mm-prolunga-filettata-m48","title":"TS-Optics 15mm Extension with M48 - 2\" Filter Thread and 2\" Diameter","description":"\u003cp\u003e\u003cstrong\u003eThe extension tube extends an adapter with M48x0.75 thread by 15 mm.\u003cbr \/\u003e\u003cbr \/\u003e\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003ebarrel made of metal\u003c\/li\u003e \u003cli\u003eblack anodized\u003c\/li\u003e \u003cli\u003edouble sided 2\" filter thread (M48x0.75) - male\/female\u003c\/li\u003e \u003cli\u003eoptical path is 15 mm\u003c\/li\u003e \u003cli\u003ethe outer diameter of the adapter is is exactly 2\" - fits into the 2\" receptacle of focusers or adapters\u003c\/li\u003e \u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cp\u003e\u003cspan\u003eThis adaptation has proven itself in many areas of astronomy. The extension tube is simply screwed into the M48 filter thread from 2\" eyepieces or 2\" adapters and therefore will extend the barrel. Thus the fitting accuracy of an adapter can be improved.\u003c\/span\u003e\u003cbr \/\u003e\u003cbr \/\u003e\u003cspan\u003eThese tube is also important for astrophotography when the correct distance between corrector and camera sensor is concerned. Here, often just a few millimetres are critical.\u003c\/span\u003e\u003c\/p\u003e \u003ctable cellpadding=\"4\"\u003e \u003ctbody\u003e \u003ctr class=\"bgltblue\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003eBarrel made of metal\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"stpage-bg\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003eblack anodized\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"bgltblue\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eThread\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003edouble sided 2\" filter thread (M48x0.75) - female\/male\u003c\/td\u003e \u003c\/tr\u003e \u003ctr class=\"stpage-bg\"\u003e \u003ctd class=\"pr9\"\u003e\u003cstrong\u003eLength\u003c\/strong\u003e:\u003c\/td\u003e \u003ctd\u003e15 mm without the male thread\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e","brand":"TS-Optics","offers":[{"title":"Default Title","offer_id":51261591224651,"sku":"TSTSVF215","price":29.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/prolunga-filettata-M48-15mm-doppio-filetto-accessorio-telescopio.jpg?v=1744220582"},{"product_id":"ts-optics-prolunga-m48-20mm-filetto-filtro-2-pollici","title":"TS-Optics 20mm Extension with M48 - 2\" Filter Thread and 2\" Diameter","description":"\u003ch2\u003eM48 Extension Tube 20 mm with 2\" Filter Thread\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eTS-Optics 20 mm M48 extension tube\u003c\/strong\u003e is designed to precisely extend accessories equipped with a \u003cstrong\u003eM48x0.75 (2\") filter thread\u003c\/strong\u003e. This adapter increases the optical spacing by \u003cstrong\u003e20 mm\u003c\/strong\u003e, allowing accurate adjustment of the distance between optical components in a telescope accessory chain.\u003c\/p\u003e\n\n\u003ch2\u003eDouble-sided M48 male\/female thread\u003c\/h2\u003e\n\u003cp\u003eThe extension features a \u003cstrong\u003edouble-sided M48x0.75 filter thread\u003c\/strong\u003e, with \u003cstrong\u003efemale threading on one side\u003c\/strong\u003e and \u003cstrong\u003emale threading on the other\u003c\/strong\u003e. It can be screwed directly into the \u003cstrong\u003eM48 filter thread of 2\" eyepieces\u003c\/strong\u003e or \u003cstrong\u003e2\" adapters\u003c\/strong\u003e, extending the barrel and improving the fitting accuracy between adapters and accessories.\u003c\/p\u003e\n\n\u003ch2\u003eImportant for astrophotography spacing\u003c\/h2\u003e\n\u003cp\u003eIn \u003cstrong\u003eastrophotography setups\u003c\/strong\u003e, the correct distance between a corrector and the camera sensor is often critical. Even a few millimetres can influence the final optical performance. 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