Description
Focus breathing and variations in picture performance with refocusing at different object distances have been traditional imaging challenges to high-end production calling for high picture quality. By adopting the novel 3-group inner focus system and setting a proper power for the front lens fixed group as well as the focus moving group, the HJ21ex7.5B succeeded in minimizing such unwanted phenomena to an exceedingly low level. Also the lens is designed to maintain high optical performance across the entire 16:9 image plane, especially at the telephoto side of the focal length.
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