{"product_id":"borg-7875-m75-helicoid","title":"BORG 7875 M75 Helicoid","description":"\u003ch2\u003eBORG 7875 M75 Helicoid | Fine screw-driven focus adjustment\u003c\/h2\u003e\n\u003cp\u003eFine adjustment of focus is the job of a helicoid: its screw-driven movement shifts an optical component along its axis, giving you a way to set focus by turning rather than relying on a camera’s focus ring. The BORG 7875 M75 Helicoid is suited to photographers and optical-system builders who need that kind of adjustment in a setup that uses this specific part. Its strength is focused, mechanical control—not being a complete camera lens with a stated focal length or aperture. That makes it relevant when you’re assembling an optical arrangement and need to move a component to bring the image into focus. Turn the helicoid gradually and watch the subject’s sharpness change; small adjustments are the practical way to approach fine focus. The product name identifies both the 7875 model code and M75 designation, so it’s best treated as a specific component rather than a general-purpose focusing accessory. If your setup depends on a particular fit, the product name alone doesn’t establish that fit.\u003c\/p\u003e\n\u003cdiv class=\"specialist-note\"\u003e\n\u003ch3\u003eSpecialist Note\u003c\/h3\u003e\n\u003cp\u003eFirst-time helicoid buyers can mistake one for a complete lens; this is a focusing component, so its role is to move an optical assembly, not to provide an image on its own. I’d use the BORG 7875 M75 where a setup needs screw-driven focus adjustment: for example, to bring an optical arrangement into focus, or to make a careful final adjustment while framing a stationary subject. Turn it in small increments and judge sharpness in the image rather than expecting the model marking to tell you how far to move it. The M75 designation and 7875 code identify this particular part; they aren’t a stated fit list. It suits someone building a specific optical setup, not someone shopping for a ready-to-use lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: BORG\u003c\/li\u003e\n\u003cli\u003eModel: 7875 M75\u003c\/li\u003e\n\u003cli\u003eType: Helicoid\u003c\/li\u003e\n\u003cli\u003eCategory: Lenses \u0026gt; Standard\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BORG","offers":[{"title":"Default Title","offer_id":57563631780180,"sku":"BG-7875","price":675.1,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/2493\/3716\/files\/BG-7875_01.jpg?v=1791804883","url":"https:\/\/www.htf-store.com\/fr\/products\/borg-7875-m75-helicoid","provider":"Hard to Find Camera Store","version":"1.0","type":"link"}