Soak the lens paper in a solution that will dissolve the oil and clean the lens without hurting it. Anhydrous alcohol, a commercially available lens cleaning solution, or mixed alcohol are all recommended. Keep in mind that certain cleaning solutions are combustible, so use caution while handling them. Alcohol itself is flammable, but its low volatility makes it less dangerous than most other fluids.
The purpose of using alcohol is to remove particles that would otherwise be visible with the unaided eye. If you have contamination on the lens that only affects the optical quality of the glass, then it can be removed with no effect on your exposure. However, if there is also material on the lens that alters how the light reaches the photocell, such as dust or moisture spots, then it will affect your exposure unless it is removed. The process of removing this type of contamination requires some form of fluid to wash it off the glass.
Alcohol has many advantages for cleaning lenses. It evaporates quickly, which means that any contaminants on the surface of the glass will be washed away before they can dry. The amount of liquid needed is very small; a few drops on a piece of lens paper is sufficient to thoroughly cleanse the entire element. The fiberglass fabric used in camera lenses is not resistant to alcohol, so care should be taken not to get any on your skin.
With a blower or soft-bristled brush, remove as much dust and grime as possible from the lens. Using a lens tissue or cleaning cloth, apply a few drops of lens cleaning solution. Working from the center out, carefully remove oil, fingerprints, and dust from the lens surface with a circular motion. Do not press hard against the lens; this can damage the coating.
When you are done, rinse the lens in clean water to remove any remaining solution. Allow to dry completely before putting back into your camera.
This article explains the different lens cleaning techniques available and how they work. It also discusses some issues you should consider when cleaning your lenses.
The two main types of lens cleaners are hydrophilic and oleophobic. Hydrophilic cleaners attract moisture from the air which then dries on the glass surface. This method is best for removing small particles such as dust. Oleophobic cleaners do not attract moisture from the air so they are not affected by humidity and can be used even if there is moisture on the glass surface.
There are several types of oleophobic cleaners including paper towels, liquid cleaners, and brushes. Brushes are the most effective way to clean a large area of the lens quickly. They come in various sizes and shapes depending on what kind of effect you want to achieve during cleaning. For example, a round brush will help you get into tiny corners that a flat one may not be able to reach.
To begin, use a photographic dust blower or compressed air to gently remove any extra dust from the lens assembly, then gently wash the lens with a cotton or foam swab soaked in lens cleaning solution or isopropyl alcohol (91 percent or higher). Let the lens dry completely before putting it back on the drive.
If you use isopropyl alcohol as your cleaning solution, then only water should remain on the lens after it's washed. Alcohol has a tendency to evaporate, so make sure there are no dry spots on the lens when you're done washing it.
After cleaning the lens of your DVD player, put some unopened beverage containers in the refrigerator to reuse as cleaning wipes.
Remove greasy dirt using a cotton swab or lens tissue and a lens cleaning solution or 100% ethanol. Stubborn contamination may need many passes or the use of a harsher solvent, such as methanol or acetone. 7. After each usage, throw away the cotton swab or lens tissue. This will prevent any debris from being trapped under the lens membrane.
As with most instruments, regular maintenance is necessary for the long-term health of your microscope. The following tips should help you keep your microscope in good working order:
Use caution not to touch the glass surface of the microscope stage when changing specimens. Use plastic dishes or containers instead.
Keep microscope slides covered with parafilm or other thin, transparent material while not being viewed under the microscope. This prevents moisture from condensing on the slide and causing damage to the specimen.
Store microscope slides in boxes, labeled by date received and contents, in a refrigerator or freezer.
Clean the objective lens of the microscope regularly. Use a soft, clean cloth and an optical quality lubricant to protect against dust and scratches. Do not use alcohol or cleaner solutions for this purpose!
Change the fluid in the microscope's bath chamber every month or so. Use a syringe to fill the reservoir below the microscope stage with fresh buffer solution.
Typically, lens cleaning solutions include alcohol, methanol, or something similar. (Methanol has a distinct sweet odor.) Most types of alcohol will work, but be sure that if you obtain denatured alcohol, it does not include oils. Oils are frequently used to alleviate the drying impact of alcohol on the skin. Additionally, avoid using turpentine as it may damage your lenses.
Lens cleansing fluids should be cleaned away from your eyes with caution because they can cause irritation even after just a few drops have been applied. If you do become irritated, immediately wash your hands and try again later when your lenses are in a better state to withstand the cleaning solution.
Lens cleaning fluids are usually sold in bottles of approximately 100 ml (3.5 oz). You should use no more than a few drops of the fluid for each glass of water. Allow the liquid to soak into the filter element of your lens for at least 30 minutes before putting them in your eye. This allows any residue on the surface of the lens to be removed.
If you wear contact lenses, be sure to clean them regularly to keep infections at bay. Use a fresh bottle of solution for each batch of contacts so as not to contaminate the others.
Contact lens cleaner is designed to remove contaminants from the plastic material of your contacts. As well as being good hygiene practice, this prevents infections developing which could lead to blindness if left untreated.
Wipe the lens with a little quantity of high-strength isopropyl alcohol. Use isopropyl alcohol with a minimum concentration of 91 percent (and ideally "reagent grade" 99.9 percent ). More diluted alcohol might cause a haze to form on the lens. Dampen the cloth slightly but do not drench it. Do not use household cleaning products with ingredients such as benzene, trichloroethylene, or methyl ethyl ketone (MEK). These substances can be toxic if inhaled or absorbed through your skin.
You should avoid exposing yourself to concentrated chemicals for long periods of time during cleaning process. If anything gets into your eye, immediately rinse it out with water until you are back in a safe environment.
If you don't have access to a lab facility where you can test a sample of the cleaning solution, there are several online services that will test liquid samples for chemical content. The most well-known is Chemical Safety Report Card from the Environmental Protection Agency. They offer free testing service for up to three containers at a time. You can search by product name or by material code (which is a number that identifies a substance).
The container should be labeled with its contents and stored in a dry place out of direct sunlight. Send a self-addressed, stamped envelope if you want a report back.