{"product_id":"borg-7761-m57-helicoid-dxii","title":"BORG 7761 M57 Helicoid Dxii","description":"\u003ch2\u003eBORG 7761 M57 Helicoid Dxii | Fine focus adjustment for M57 setups\u003c\/h2\u003e\n\u003cp\u003eBORG 7761 M57 Helicoid Dxii is an M57-designated helicoid for photographers and optical-system builders who need adjustable focus spacing in an M57 setup. A helicoid uses a turning movement to extend or retract an optical assembly, giving you a controlled way to refine its position rather than relying on a fixed-length connection. That makes it relevant when setting up close-focus work or fine-tuning the spacing in a modular optical arrangement. The product is best understood as a component for a system you’re assembling, not as a complete lens. Its value is in the adjustment it provides: you can make changes in small increments as you work toward the focus your setup requires. The name also identifies it as the Dxii version, so the exact model is easy to distinguish when planning an arrangement around BORG parts. It’s a specialist item, and its usefulness depends on the rest of your optical setup.\u003c\/p\u003e\n\u003cdiv class=\"specialist-note\"\u003e\n\u003ch3\u003eSpecialist Note\u003c\/h3\u003e\n\u003cp\u003ePhotographers building a modular optical setup and carefully dialing in focus are the people I’d point toward the BORG 7761. The M57 designation gives you a clear starting point when you’re planning an arrangement around that standard; treat it as a system component, not a lens you can use on its own. Its helicoid mechanism is the practical reason to choose it: rotate it to adjust the spacing, then refine the position until your subject comes into focus. That can be handy for close-up work or for fine adjustment during optical setup. One honest caveat: the helicoid alone can’t tell you whether a particular arrangement will reach focus; that depends on the complete system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProduct name: BORG 7761 M57 Helicoid Dxii\u003c\/li\u003e\n\u003cli\u003eModel number: 7761\u003c\/li\u003e\n\u003cli\u003eDesignation: M57\u003c\/li\u003e\n\u003cli\u003eProduct type: Helicoid\u003c\/li\u003e\n\u003cli\u003eVersion: Dxii\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BORG","offers":[{"title":"Default Title","offer_id":57503312281940,"sku":"BG-7761","price":342.25,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/2493\/3716\/files\/BG-7761_01.jpg?v=1791566167","url":"https:\/\/www.htf-store.com\/es\/products\/borg-7761-m57-helicoid-dxii","provider":"Hard to Find Camera Store","version":"1.0","type":"link"}