{"product_id":"heliopan-25-5mm-variable-nd-schott-glass-filter-nd-0-3-to-nd-1-8","title":"Heliopan 25.5mm Variable ND Schott Glass Filter (ND 0.3 to ND 1.8)","description":"\u003cdiv\u003e\u003cstrong\u003eItem Includes\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eHeliopan ND-VARIO Variable Neutral Density Filter\u003c\/li\u003e\n\u003cli\u003ePremium Rotatable Brass Frame with Front Thread\u003c\/li\u003e\n\u003cli\u003eProtective Storage Case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eOverview\u003c\/strong\u003e\u003cbr\u003eThe Heliopan ND-VARIO is a premium, Germany-made variable neutral density filter designed for creative exposure control in film and photography. It allows stepless regulation of light intensity from ND 0.3 to ND 1.8, replacing a pocket full of individual fixed gray filters.\u003c\/div\u003e\n\u003cdiv\u003eBuilt with an expertly processed brass frame, this filter maintains a standard profile diameter that matches your lens thread, meaning it is not overbuilt and remains compatible with your standard lens hood. By utilizing two high-grade polarization foils sandwiched between optical glass, turning the outer ring changes the gray value smoothly to open vast creative possibilities.\u003c\/div\u003e\n\u003cdiv\u003eFor videographers shooting on DSLR or mirrorless cameras, it is essential for maintaining the ideal 1\/50 or 1\/60 shutter speed at open apertures in bright sunlight to prevent choppy footage. For portrait and landscape photographers, it enables wide-aperture shallow depth of field in midday light or extended long exposures to turn running water smooth and wipe moving crowds from a scene.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eStepless Light Regulation: Seamlessly scales exposure reduction from ND 0.3 up to ND 1.8 without swapping filters.\u003c\/li\u003e\n\u003cli\u003eWide Exposure Range: Delivers a variable extension factor ranging from 2x to 64x, spanning up to 6 exposure stops.\u003c\/li\u003e\n\u003cli\u003eTrue-Size Brass Frame: High-quality brass construction features a front thread matching the screw-in diameter to avoid bulky outer rings.\u003c\/li\u003e\n\u003cli\u003eLens Hood Friendly: Slim, non-overbuilt engineering ensures you can still mount your standard lens hood over the filter.\u003c\/li\u003e\n\u003cli\u003eCinematic Shutter Control: Empowers video creators to shoot at bright apertures under direct sun while locking in natural motion blur.\u003c\/li\u003e\n\u003cli\u003eLong Exposure Utility: Drastically slows shutter speeds down for artistic water blur and clean, crowd-free architectural photography.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eFilter Type: Variable Neutral Density\u003c\/li\u003e\n\u003cli\u003eHeliopan Model: Type 2099\u003c\/li\u003e\n\u003cli\u003eDensity Range: ND 0.3 to ND 1.8\u003c\/li\u003e\n\u003cli\u003eExposure Reduction: 1 to 6 Stops\u003c\/li\u003e\n\u003cli\u003eFilter Factor Range: 2x to 64x Extension\u003c\/li\u003e\n\u003cli\u003eFrame Material: Premium stable brass with matte black anti-reflective finish\u003c\/li\u003e\n\u003cli\u003eFront Thread Size: Same diameter as the filter thread size\u003c\/li\u003e\n\u003cli\u003eBase Diameter Example: 52 mm\u003c\/li\u003e\n\u003cli\u003eOptical Construction: Two polarized optical glass foils in a rotatable assembly\u003c\/li\u003e\n\u003cli\u003eWide Angle Note: Best performance on lenses 35mm and longer; crossed-polarization shadows or slight blue color shifts may appear near maximum density on extreme wide lenses\u003c\/li\u003e\n\u003cli\u003eCountry of Origin: Germany\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e","brand":"Heliopan","offers":[{"title":"Default Title","offer_id":51394875425063,"sku":"20991525","price":299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0877\/0597\/7127\/files\/2099.jpg?v=1778775708","url":"https:\/\/cambridgeworld.com\/products\/heliopan-25-5mm-variable-nd-schott-glass-filter-nd-0-3-to-nd-1-8","provider":"Cambridge World Inc","version":"1.0","type":"link"}