Dust cap for the trinocular photo (camera) port of the Olympus BH2-TR30 and BH2-SWTR30 trinocular viewing heads (BH-2 microscopes). It keeps dust out of the photo tube while no camera adapter or NFK photo eyepiece is fitted. - Fits: Olympus BH2-TR30 and BH2-SWTR30 trinocular viewing heads - The cap slips over the photo tube; a slotted inner collar plugs into the port and holds the cap by light friction - Faceted side for an easy grip - Size: 58.8 mm across the corners, 15.75 mm tall, inside diameter 53.5 mm - Material: PETG, black. 3D printed (fine layer lines are visible) - Quantity: 1 cap To fit: push the cap straight down over the open photo tube until it seats. To remove: pull it straight up. Please check the model name on your viewing head before ordering. This cap is for the photo port without an NFK eyepiece installed. Aftermarket part, not made by or affiliated with Olympus. Product images are CG renderings, not photos.