{"product_id":"askar-m54-m48-backfocus-adjuster","title":"Askar M54\/M48 Backfocus Adjuster","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Askar M54\/M48 Backfocus Adjuster is an astronomy imaging accessory used to fine-tune camera spacing in an optical train. It is intended for astrophotography setups where precise backfocus adjustment is required between a telescope, reducer, flattener, filter drawer, OAG, or camera.\u003c\/p\u003e\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\u003cp\u003eThis accessory is best for astrophotographers who need small spacing adjustments to dial in field correction, improve star shapes, or match the required camera-side backfocus for their imaging system.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eUseful for fine backfocus adjustment in imaging trains.\u003c\/li\u003e\n\u003cli\u003eSupports M54\/M48-style astronomy connections.\u003c\/li\u003e\n\u003cli\u003eHelps tune camera spacing for reducers, flatteners, and correctors.\u003c\/li\u003e\n\u003cli\u003eCompact accessory for deep-sky astrophotography setups.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBackfocus adjustment for cooled astronomy cameras.\u003c\/li\u003e\n\u003cli\u003eSpacing correction with reducers and flatteners.\u003c\/li\u003e\n\u003cli\u003eImaging-train tuning for better corner star performance.\u003c\/li\u003e\n\u003cli\u003eAccessory spacing in M54\/M48 optical systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eConfirm thread compatibility, required spacing, and available mechanical clearance before use. This draft uses placeholder pricing and should be reviewed manually before publishing.\u003c\/p\u003e\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThis is an adapter\/accessory only; it is not an optical telescope or camera.\u003c\/li\u003e\n\u003cli\u003eExact compatibility depends on the user's telescope, reducer\/flattener, filter drawer, OAG, and camera setup.\u003c\/li\u003e\n\u003cli\u003ePricing is set to $0.00 as a manual placeholder.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\u003cp\u003eOntario Telescope recommends this accessory for imagers who need to fine-tune backfocus spacing in an M54\/M48 imaging train.\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53155943121007,"sku":"ASK-M54-M48-BACKFOCUS","price":198.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/backfocusadjuster1.webp?v=1779736411","url":"https:\/\/ontariotelescope.com\/products\/askar-m54-m48-backfocus-adjuster","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}