{"product_id":"m42-spacer-kit","title":"M42 スペーサーキット","description":"To achieve the best astroimages, it is important to attain the proper back-focus distance for your camera relative to the telescope it is being used with. If the back-focus distance your camera consumes is not exact, the performance at the corners of full frame imaging sensors will suffer—stars will appear elongated and not as pinpoints.\u003cbr\u003eExample: RASA 8 with a ZWO ASI 183 MC PRO camera\n\u003cul\u003e\n\u003cli\u003eRequired back-focus distance for RASA 8 with included M42 camera adapter: 25mm\u003c\/li\u003e\n\u003cli\u003eBack-focus consumed by ZWO ASI 183 MC PRO camera: 17.5mm\u003c\/li\u003e\n\u003cli\u003eTo achieve equal back-focus distance, a 7.5mm M42 spacer ring is required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003cbr\u003eCelestron's M42 Spacer Ring kit includes three different length spacer rings to achieve the proper back-focus distance with our popular Celestron optical tubes and T-thread camera adapters.\u003cbr\u003e \u003cbr\u003e\u003cstrong\u003eHow to Use\u003c\/strong\u003e\u003cbr\u003eDepending your method of astrophotography (DSLR or CCD\/CMOS), there are two ways to use the M42 Spacer Ring. If you are using a DSLR, place the desired M42 Spacer Ring between your T-Ring and your T-Adapter for your optical tube. If you are using a CCD or CMOS camera, place the desired M42 Spacer Ring between the camera and the T-Adapter for your optical tube.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eBelow is a quick guide to help you determine which spacer ring to use for our EdgeHD, Schmidt-Cassegrain, and RASA 8 optical tubes:\u003c\/p\u003e\n\u003ctable class=\"compatibility-table\" style=\"width: 533px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 106.8px;\"\u003eSpacer Ring Size:\u003c\/td\u003e\n\u003ctd style=\"width: 411.2px;\"\u003eWorks best with:\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 106.8px;\"\u003e7.5mm\u003c\/td\u003e\n\u003ctd style=\"width: 411.2px;\"\u003eProvides proper spacing with \u003cstrong\u003eRASA 8\u003c\/strong\u003e for many ZWO cameras\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 106.8px;\"\u003e12mm\u003c\/td\u003e\n\u003ctd style=\"width: 411.2px;\"\u003eProvides proper spacing with \u003cstrong\u003eRASA 8\u003c\/strong\u003e for many Atik cameras\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 106.8px;\"\u003e30mm\u003c\/td\u003e\n\u003ctd style=\"width: 411.2px;\"\u003eConverts ZWO camera w\/filter slider to 55mm back-focus standard for use with \u003cstrong\u003eSchmidt-Cassegrain \u0026amp; EdgeHD\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cbr\u003e\u003cstrong\u003eBody\u003c\/strong\u003e\u003cbr\u003eThe M42 Spacer Rings are machined aluminum black anodized. The internal surfaces are blackened and glare-threaded to provide the highest contrast. Each spacer ring has a knurled surface, providing a great gripping surface for threading\/unthreading. The M42 Spacer Rings are compatible with M42 x 0.75 (T-thread) camera adapters.","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43890885853226,"sku":"93618","price":15000.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/4544\/3882\/files\/93618_M42_Spacer_Ring_Kit_01_9f2007ea-a45b-4ea8-b780-76b94c409e9e.jpg?v=1765307304","url":"https:\/\/celestron.jp\/products\/m42-spacer-kit","provider":"Celestron（セレストロン）日本公式サイト","version":"1.0","type":"link"}