Question
Among the Sony lenses there are some types with a DT abbreviation and some are without it. Those having DT called DT-series.
What does DT mean? What is the difference between DT-series lenses and the rest of Sony?
Answer
DT (Digital Technology - source) means that the lens is designed to work with a cropped sensor camera. It should not be used with a full frame sensor or 35mm film. If you use it with a full frame sensor then some of the image would be black, particularly towards the corners, as the light projected by the lens would not cover the sensor.
Having a smaller area to project light on to means that lenses can be smaller, lighter and are generally cheaper. However if you later upgraded your DSLR body to one with a full frame sensor you would have to replace the lens.
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