推荐回答（3个）
非常有必要 先不说他的功效
但是它对你的镜头有保护作用 毕竟镜头贵UV镜便宜
100以内的也有不错的 肯高有100以内的 可以去网上搜索问价
UV镜可以避免你的镜头被划伤 防止被酸性物质腐蚀
气吹是需要买的 如果镜头上有灰尘颗粒 需先用气吹清理 如果直接擦拭那些颗粒会划伤镜头 镜头笔可以把卡在无法清理的地方的细小颗粒清理出来 推荐RMB50元的套装清洁套件就可以满足你的需求
并且那些你所谓的那些大部分人说的UV对画质有所影响 无非两类人 一种是新手并不了解这些实际用途和功效 只是道听途说 另一类人资深玩家 他们玩遍了这些个物件从实践中检验出的一套理论 确实会有细微的影响 但是不会影响到一个新手 因为我们涉及的领域还不够深 所以可以说无从影响 等你熟悉了你的机子后 这些东西你就明白了
但是我推荐你去买个便宜的UV镜一直装在上面当做保护镜来用 而所谓的会影响对焦速度 理论上会影响 但是不会影响你的实际操作
跑焦问题我用了感觉不从在 不知道你是否自己试验过 跑焦是你自己操作的问题再对焦后没有合理的构图移动 或者在按快门的时候相机动了 既然拿了单发就要专业一些 多看些拍照姿势 怎么保持平衡 气息与快门怎么配合 在百度上搜着看一下 三年前我也跟你一样 慢慢就都了解了 其实没有那么神秘 操作刚开始觉得不好上手 到后面玩的是自己的创意和摄影技法了
我建议你如果拍风光的话 去买个不错的偏振镜 这东西拍风光可以压暗天空的颜色 使天空颜色更加通透 试一试就知道了
我是玩这个的并且也是学生 不过我用的是尼康的机子
希望对你有用 如果有什么问题你可以再问我 呵呵
很有必要
UV镜其实有两个功能：
1、UV镜能减弱因紫外线引起的蓝色调。同时对于数码相机来说，还可以排除紫外线对CCD的干扰，有助于提高清晰度和色彩的效果。
2、现在的相机镜头一般都是镀膜镜头，比较娇嫩，如果没有UV镜的保护，如果粘上异物或在风沙情况下导致风沙侵入镜头在清理时及易划伤镜头表面镀膜，严重时可能会导致镜头报废。
买一个UV镜多钱？买一个镜头多钱？。。。买个便宜点的UV镜吧，等你玩明白一点单反以后再买个好的，几十块钱想换就换了，最后还有一句话，想破产，玩单反。
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