{"product_id":"optec-dsi-3-5-extension-tube-set-5-piece-set","title":"Optec DSI 3.5 Extension Tube Set, 5-piece set","description":"\u003cp\u003eDSI 3.5 x 24 threaded adapters provide a large diameter, robust means of connecting various pieces of imaging equipment to a telescope. This set of 5 extension tubes in 0.5, 0.75, 1, 1.5, and 3 inch lengths allows for the addition of extra length in an imaging train to achieve the correct backfocus distance, a stringent requirement for most astrographs.\u003c\/p\u003e\n\u003cp\u003eOptec P\/N: 19890\u003c\/p\u003e","brand":"Optec Inc.","offers":[{"title":"Default Title","offer_id":53220829331750,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0915\/3282\/0774\/files\/19890_001_full.jpg?v=1779074499","url":"https:\/\/scarletastro.com\/products\/optec-dsi-3-5-extension-tube-set-5-piece-set","provider":"Scarlet Astronomy Systems","version":"1.0","type":"link"}