Pentax interchangeable focusing screen SI designed for bellows and photomicrography with engraved scales allowing photographer to determine image magnification and subject size. There are couple of extremely light marks in the screen. There are scale markings on the horizontal axis, but they do not show in my photo. This screen, designed originally for the MX, also fits the LX. With case and tool. Return for refund if not satisfied. Buyer prepays (check, money order, Paypal) and adds shipping. Shipping discounted for two or more auction items shipped together. Missouri in-state residents pay sales tax. No tax when shipped out-of-state or international.