Those who seriously took a great interest in photo art know very well that the lens plays an important role in creating a quality and good photo. Acquiring such an important detail, many beginners have the question: "And how to check the lens when buying?". What you need to do for this and how not to buy a useless thing - read below.
Checking the lens before purchase
When you are going to take a new lens with you, you need to take two things: a laptop, to check the quality of photos on a large screen, and a magnifying glass to carefully see the appearance. Although, if you are going to purchase a lens in the store, it is very unlikely that you will get scratched glass. But if you buy a lens from your hands, then take a magnifying glass, do not be too lazy.
How to check the lens in the store? Let's start with a visual inspection of the lens itself and its configuration. A lid and a warranty card must necessarily go with the lens, it will be great if you also attach blends with a cover to it. A thorough visual inspection will help you to identify the presence of cracks and dents on the body. Attach the lens to the camera, it should fit snugly against it, without strong backlashes.
Particular attention should be paid to the glasses. They must be whole! If you notice at least one scratch, you can safely put this lens aside. Especially critical is the presence of scratches on the rear lens. Remember the main rule, the closer the defects are to the matrix, the worse the image will turn out.
And now tell another trick. When buying a lens that was in use, shake it a little and inspect the bolts. If you hear bryakanie and saw scratches on the bolts, you know - the lens was being repaired.
Having inspected the lens from the outside, look inside, there practically should not be dust. But, if you notice a little, do not be discouraged. Over time, dust appears in any optics, even on the most expensive and carefully rubberized.
How to test the lens?
Acquiring a lens, in addition to inspection, you can conduct tests of focus and sharpness. The simplest and easiest test is to check the lens in operation. If you are going to shoot landscapes, ask the seller for permission to go outside and take a few pictures, which you then look on the laptop. If you are going to take portrait shots , then take a few shots, pointing the lens at people, and then also view the resulting image on the monitor. If you do not have the opportunity to perform these simple tests, then ask the store staff to give you some space for other test procedures.
Screening test. On a flat surface, put a "target", and install the camera itself on a tripod at an angle of 45 °. Aim the center of the "target" and take some pictures at the maximum and minimum focal length, given that the aperture should be fully open. Throwing pictures on
When choosing a lens for professional photography, set yourself up to work hard and spend a good amount of time in order to check the purchase. After all, it's better to immediately buy a good and suitable thing, than then run around the service centers by changing or repairing it.