7.3.2 Cleaning Optics
WARNING: Do not touch lens surfaces with your fingertips. Fingerprints might destroy optical coatings over time. Only clean optical surfaces with proper cleaning supplies, and then only when necessary.
If a lens is covered with loose dust, first try blowing off this dust using a can of optical grade (oil-free) canned compressed air. Be careful not to shake the lens, or propellant might blow onto the lens. As alternative, use a lens brush to gently wipe off the dust. If the lens is soiled with greasy deposits which cannot be blown or brushed off , use an alcohol-based commercial lens cleaner and a lens tissue or a lens cloth. These items are available from camera stores. Apply the lens cleaner generously to dissolve the grease, and then blot off the lens cleaner and dissolved grease using minimum motion. Avoid rubbing the lens, since hard particles from the deposit or the lens cloth could scratch the optical coatings. If the greasy deposits do not come off with the lens cleaner, use a stronger solvent such as reagent-grade acetone as a last resort. Gently wipe the lens surface while moving the lens cloth to always present a clean surface to the lens. Wipe in a circular manner moving from the center of the lens toward the outer edge. Do not reuse the lens cloth to avoid redepositing contaminants.
Optical Grade Compressed Air
7.3.3 Cleaning Critical Mechanical Parts
Critical components are covered and are not user serviceable. Should the stage mechanics bind or require service, contact your Starrett representative. The lead screw uses a self-lubricating TFE coating, which is designed to last for the life of the product. Do not apply cleaner or lubricant, which could collect dirt and impair system performance.
7.3.4 Recommended Spare Parts
The only recommended spare part is extra stage glass in case the original breaks or cracks.
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