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How to test the out of focus of the Tenglong lens

2026-07-25 12:09
2026-07-25 12:24

Taking the Tenglong 35/1.4 lens as an example, the test of out-of-focus can be carried out according to the following steps: First, the shortest focusing distance of the lens must be determined (for example, the shortest focusing distance of the Tenglong 35/1.4 lens is 0.3 meters or 30 centimeters, which is the distance between the sensor and the subject). Use a tape measure to ensure that the distance between the center of the test card and the sensor is the shortest focusing distance to obtain an accurate test result. Then, adjust the lens aperture to the maximum and shoot at the center of the test card. Check the results to determine if the lens is out of focus and the amount of deviation (for example, the lens is shifted back by 8mm in the example). In addition, for other lenses of Tenglong, a similar method could also be used. For example, for lenses that were about 1.5 - 2 cm away from the focal length 17 and had a regular change in focal length, a similar test method could be used under different focal lengths. During the test, you should pay attention to the influence of different factors on the amount of out-of-focus.(For example, it is found that the out-of-focus of the lens does not matter whether the optical anti-shake switch is on or off, but the law changes when the aperture size changes). Read more exciting novels for free

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2026-08-02 13:39
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