Konus Biorex Series Microscope Filter Set. The transparent filter is used with a user-selected gelatin filter. This Konus Microscope Accessory allows the observer to see details in a slide or specimen which were not visible to them in normal white light. The Konus Biorex Series Microscope Filter Set 5651 is specifically designed for the Konus Biorex Microscope 5601 and Konus Biorex Microscope 5605. Package Content Konus Biorex Series Microscope Filter Set 5651 We offer a complete line of Konus Microscope Accessories. For our complete selection of products by Konus on sale please visit our Konus page. For more Microscope Accessories please visit our Microscope Accessories store section.