Dear photographers, I use an older model of the Russian panoramic camera, this one: http://www.guenterposch.de/Horizont_Kamera.html I bought this camera and (not the contemporary model Horizon (without T) 202 and sisters) because it is not made from plastic. The usage of a filter is not intended for this camera. I want to use an IR filter and decided to roll my own. I bought a Cokin filter, type A is sufficient. IR has the number 007. These are plastic and not glass filters. It is to cut in pieces. I cut a 16x17 mm² piece form this filter and chamfered the edges. The piece of filter can be squeezed in the channel in front of the objective. May be it is necessary to use samm small pieces of Postersstrips at two corners. To remove it the usage of a needle may be necessary. To cut Cokin filters simply score id form both sides. Then it can be broke into two pieces. May be this method is useful for the Horizion 202 cameras too.