https:\/\/en.m.wikipedia.org\/wiki\/CR-39<\/a>
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nFirst camera filter made of high quality 100%\noptical resin material CR-39 using nano technology. The most neutral camera\nfilters in the market, more scratch resistant, more fingerprint, water and oil\nresistant, with better UV and IR coating as well as antistatic and antifog\ncoating. The filters are easy to clean, perfectly colour neutral and shock\nresistant. Scratches do not necessarily affect the performance of the filter\nbecause the pigments are not applied only to the surface of the filter as in\nthe case of glass filters, instead, all our filters are bulk tinted. Light\nscratches are therefore not visible in the captured images. Perfect results are\nalso guaranteed when combining various filters.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
MEDIUM GRADUAL ND filters have variable\ndensity throughout filter space (from dark to light with hard transition). This\nmeans that the amount of light coming into the camera is reduced gradually.\nThis is very useful in situations when some parts of the photograph are\noverexposed (the sky is too bright - especially at sunsets and sunrises).\nMEDIUM GRADUATED ND filters are suitable for scenes with rugged horizon. These\nfilters are perfect compromise between HARD and SOFT GRADUATED filters. MEDIUM\nGRADUATED ND filters can be used in combination with full or graduated filters.<\/p>\n\n\n\n\n\n
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