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Xenon short-arc lamp: Difference between revisions
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5. Re-adjust the axial alignment to bring the plasma back into focus, until you have a tight symmetrical circle free of light (plasma) fluttering around the anode shadow. | 5. Re-adjust the axial alignment to bring the plasma back into focus, until you have a tight symmetrical circle free of light (plasma) fluttering around the anode shadow. | ||
6. Put in a lens ([[Aspect ratios|CinemaScope]] is usually best as you want the largest aperture). After you put the lens back in look for even illumination across the screen. With the lens in, the shadows will be gone and there will be a hotspot in the center of the screen. Focus the lamp (making fine X and Y axis adjustments as necessary) until no shadows are visible at the corners and the illumination is even across the screen. You want it bright, flat and centered with no hot spots! Changeover from projector 1 to projector 2 | 6. Put in a lens ([[Aspect ratios|CinemaScope]] is usually best as you want the largest aperture). After you put the lens back in look for even illumination across the screen. With the lens in, the shadows will be gone and there will be a hotspot in the center of the screen. Focus the lamp (making fine X and Y axis adjustments as necessary) until no shadows are visible at the corners and the illumination is even across the screen. You want it bright, flat and centered with no hot spots! Changeover from projector 1 to projector 2. You want them to look as similar as possible. | ||
7. You may want to fine-tune the lamp focus with the lens in place until you have even illumination, then take the lens out again to check the symmetry of the anode shadow. | 7. You may want to fine-tune the lamp focus with the lens in place until you have even illumination, then take the lens out again to check the symmetry of the anode shadow. | ||