固定光圈镜头
价格优势：与可调光圈镜头相比，定光圈镜头结构简单，价格一般更便宜，性价比更高。
便携性：定光圈镜头体积小、重量轻，适合拍摄运动场景。
操作简单：无需调整光圈大小，使用更方便快捷。
图像质量稳定：固定光圈可确保相同的景深和光线效果，图像质量更加稳定可靠。
耐久性强：结构简单，降低了机械部件发生故障的可能性，使用寿命长。
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