{"product_id":"askar-m48-m54-back-focus-adjuster","title":"Askar M48 \/ M54 Backfocus Adjuster","description":"\u003ch2\u003eAskar M48\/M54 Back Focus Adjuster\u003c\/h2\u003e\n\u003cp\u003eIn daily astronomical shooting, the back focus will have an influence. Astronomical photographers are often frustrated by the change of back focus due to various reasons such as refraction of filters or when using some products with sensitive back focus. To solve this problem, ASKAR launched the back focus adjuster, (providing the adjustment range from 16mm-20mm), which can be adjusted ± 2mm of the back focus. We offer two specifications for the back focus adjuster, the camera side adapter M54 and M48, which are convenient for users to choose from.\u003c\/p\u003e\n\u003cp\u003eThe M54 back focus adjuster's front telescope interface is female thread M54x0.75 and the rear camera interface is male thread M54x0.75, the overall thickness is 18mm and offers ± 2mm adjustment range.\u003cbr\u003e\u003cbr\u003eThe M48 back focus adjuster's front telescope interface is female thread M54x0.75 and the rear camera interface is male thread M48x0.75, the overall thickness is 18mm and offers ± 2mm adjustment range.\u003cbr\u003e\u003cbr\u003eThe back focus adjuster is CNC machined. Each unit is a 0.05mm precision adjustment, the surface is printed with a scale for easy adjustment and to save the position. There are two holes for fixing screws, which make the adjuster easy to use with different products.\u003cbr\u003e\u003cbr\u003eBy rotating the back focus adjuster, it can be adjusted between ±2mm to match the back focus requirement, and to solve the various imaging problems caused by the back focus.\u003cbr\u003e\u003cbr\u003eUsers just need to choose according to their product's rear adapter.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAskar M48\/M54 Back Focus Adjuster\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAskar Warranty\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Askar","offers":[{"title":"M48 Back Focus Ajuster","offer_id":44200413593829,"sku":"ASK-M48-BF-ADJUST","price":170.0,"currency_code":"CAD","in_stock":true},{"title":"M54 Back Focus Ajuster","offer_id":44200413790437,"sku":"ASK-M54-BF-ADJUST","price":199.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/products\/askar-m48-m54-backfocus-adjuster-astronomy-plus-1.webp?v=1715808831","url":"https:\/\/istronomyplus.com\/products\/askar-m48-m54-back-focus-adjuster","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}