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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Antispam question: Please provide registration password: Answer: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON New! Upload Image Smilies [quote][i]Originally posted by Luiz Paracampo[/i] [br]Gerard If you had a good filter this phenomenon would never happen. Good filters are colored in the mass of the glass. These problems do only occur in "sandwich filters". two glasses and a gelatine sheet inside. Normally those ND filters are coloured in the mass. Very probably you have a polarizing filter which are generally constructed in the "sandwich technology" Hetaparite crystals are melted in the gelatine and iserted between the glasses. When old those crystals modify their estructure and dimensions, loose their properties and cause internal strains that you see like Newton's rings. LP [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.