Figure 2
Magnified images of a copper #2000 mesh demonstrating the effect of the diffuser: (a) without the diffuser and (b) with the diffuser. In (a) the illumination is not uniform, while in (b) uniform illumination of approximately 200 µm in diameter can be achieved. The large thick mesh is for supporting a photoelectric membrane of the zooming tube. A zoomed-up image (c) demonstrates the good spatial resolution. The magnification of the zooming tube was ×10 for (a) and (b), and ×100 for (c). The exposure time was 50 s for (a) and (b), and 5 min for (c). |