{"product_id":"takahashi-universal-rack-and-pinion-focuser-50-8mm-mewlon-250","title":"Takahashi Universal Rack and Pinion Focuser 50.8mm (Mewlon-250)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's universal rack-and-pinion focuser in its 50.8 mm form, listed for the Mewlon-250. 50.8 mm is the 2″ format — the size most modern eyepieces, diagonals and camera adapters are built to, which makes this the version to choose if your accessories are not Takahashi's own 36.4 mm standard.\u003c\/p\u003e\u003cp\u003eA rack-and-pinion focuser drives the drawtube on a toothed rack rather than a friction roller, which is what lets it hold a load without slipping. On a Cassegrain like the Mewlon, with a diagonal and eyepiece or a camera train hanging off the back, that is the point of the mechanism.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you run a Mewlon-250 with 2″ eyepieces or a modern imaging train and want the focuser sized to match.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50.8 mm (2″) drawtube:\u003c\/strong\u003e the standard format for modern eyepieces and imaging accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion drive:\u003c\/strong\u003e positive engagement that holds position under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListed for the Mewlon-250:\u003c\/strong\u003e one of four versions in this focuser range.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eVisual observing with 2″ eyepieces and deep-sky or planetary imaging on a Mewlon-250, where the focuser carries a real load.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi builds this focuser in four combinations: \u003cstrong\u003e36.4 mm and 50.8 mm drawtube sizes, each in a Mewlon-250 version and a Mewlon\/CN version.\u003c\/strong\u003e We stock all four. Tell us your telescope and what you are putting behind the focuser and we will confirm which of the four you want.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFour versions exist:\u003c\/strong\u003e two drawtube sizes across two telescope fittings. Matching both is what gets the right part, and we will check it with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e50.8 mm is the 2″ format:\u003c\/strong\u003e the right choice for most modern eyepieces and camera adapters. Takahashi's own visual accessories use the 36.4 mm thread, and we stock that version too.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWe are still waiting on a product photo:\u003c\/strong\u003e Takahashi's listing carries no image for this focuser, so the page shows none rather than a picture of a different version. Ask us and we will photograph or describe the item in stock.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFitting a focuser is more involved than adding an accessory — it mounts to the telescope's rear cell. If you would rather not do it yourself, talk to us before you order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does 50.8mm refer to?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe drawtube size — 50.8 mm is 2″, the standard modern format.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich telescope is it for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Mewlon-250.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I get 50.8mm or 36.4mm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIf your eyepieces and adapters are 2″, this one. If you are running Takahashi's own visual accessories on their native thread, the 36.4 mm version.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 2″ rack-and-pinion focuser for the Mewlon-250 — the version that matches modern eyepieces and imaging trains.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086092619887,"sku":"TAK-TKA00708","price":1086.0,"currency_code":"CAD","in_stock":true}],"url":"https:\/\/ontariotelescope.com\/products\/takahashi-universal-rack-and-pinion-focuser-50-8mm-mewlon-250","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}