Hi, When bought new the AF-300/4 comes with two filter holders (at least mine did, bought in NYC, 1992). The normal one is fitted with a screw in, 39 mm UV-filter and is mounted in the lens. The other one is the gel. filter holder you refer to. It came with the lens "in the box" and was included in the price. I do think that a glass filter is the best to use since gel. filters are thinner and the formula is optimized with the glass included. Using gel. filters would be like using the lens without a filter in the light path which should degrade the optical performance. /Jesper /nosignature ---------------------------------------------------------------------- Jesper Sallander Tel. nat. 08-790 72 95 Physics I, Atomic and Molecular Physics Tel. int. +46-8-790 72 95 Royal Institute of Technology Fax +46-8- 20 04 30 SE-100 44 Stockholm Mobile phone 070-768 14 92 SWEDEN E-mail: [EMAIL PROTECTED] ----------------------------------------------------------------------
