Following the discovery of powder diffraction by Debye and Scherrer, a major improvement of the intensity of diffraction patterns was attained by introducing focusing cameras. The focusing principle is exploited in the Seemann-Bohlin camera and with improved general background in the Guinier focusing camera. Guinier used a bent crystal to focus Ka lines from the target radiation. Das Gupta, Schnopper and Metzger reported a modification of the Seemann-Bohlin camera by replacing the slit with a target positioned on the focusing circle. This was further improved by using a microfocus target, 30 x 100 micron, positioned accurately on the focusing circle, Fig. 1 (a). The arrangement was very successful for determining thermal expansion coefficients of elements and a few superconducting alloys at different temperature regions.