INTERCHANGEABLE FOCUSING SCREENSTo remove the focusing screen, first remove the finder, then insert your fingernailunder the rear edge of the screen and lift it out.To install a screen, simply insert the front edge under the central ridge, and push therear edge down into place.Nikon offers you a choice of 13 inter-changeable focusing screens. Theadvanced B-type BnteView screen issupplied with the F4 as standard equip-ment. The following is a chart listing allinterchangeable screens.