The 77529 F/# Matcher has precise X,Y and Z focus adjustment for optimal alignment of the fiber image with the monochromator slit. It has a 1.5 Inch Series female Quick Connect flange and an adapter to hold any Oriel Fiber with standard or Quick Connect 11 mm ferrule. The 77529 also has a 1/4-20 tapped hole for rod mounting. Even with flange mounting, you should rod mount the F/# Matcher for added stability. A 4.4 inch (112.5 mm) clearance between the F/# Matcher’s housing and its output focal point allows enough room to place a filter wheel. The fiber image is focused through the filters, into the monochromator. We supply an adjustable extension tube with the F/# Matcher, adjustable from 65 to 112.5 mm.