Your camera and lens combo worths probably more than an average man in Hungary earns in two months; bearing this in mind, taking care of your equipment is vital in order to keep it as your loyal companion. It is said, however, that the lens itself is even more important than the camera itself, so there are some steps you need to take first.
Wiping off the dust from the front lens is usually not enough. You always need to be prepared for the worst that can ever happen to your precious lens, dropping it. The most significant step is to protect the front glass element. There are two ways to do so; either you buy a screw-in filter or purchase a lenshood that prevents the front elment from being exposed to sudden landings.
Screw-in filters, usually UV filters for protection, are said to decrease image quality; but it's barely noticeable with today's 18-20-megapixel sensors. One great advantage of using a filter is that it protects the front lens from smudge marks, fingerprints, dust, waterdrops. Another reason that must be considered when buying one is that it absorbs the force of the impact when the lens is dropped, and it's way more cheaper to replace a broken filter than a whole glass unit!
Some others, on the other hand, prefer using a lenshood for the sake of protection. Lenshoods also absorb the force that's generated by accidental droppings, but they don't protect the lens from fingerprints, smudge marks, and other impacts. What's more, it doesn't reduce the sharpness of the image, while it prevents your image from getting unwanted flares.
Apart from protecting it from having its front lens element crashed, there are other things to keep in mind. For instance, avoid keeping your lens in humid environment. Humidity can make fungus grow inside the lens, which may apparently destroy the coating on the glass elements. If you swap lenses, be sure to put both the front and the rear cap on the lens body to avoid dust gathered inside it.
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