Artifex Engineering Fixed Plate Holder

The straightforward design is built to handle square optical devices with fixed width. They are positioned by sliding in from the top. This ease of handling allows quick handling without distracting the operator. Yet, accuracy is maintained by precision machining and adjustable spring tension to keep the device perpendicular to the optical axis. * For 2 inch x 2 inch (50.8mm x 50.8mm) square filters, plates, test targets. * Adjustable spring tension holds plates perpendicular to optical axis. * Special inclined design for working in the dark. * Maximum plate thickness, 3mm. * Mounts on 1/4-20 (M6) post or threaded base.