Unverified78% confidenceCautionTime unknown
只在阳光充足白天拍摄的普通爱好者不建议买f/2.8恒定光圈重炮，重量翻倍且价格高数倍，白天缩光圈到f/5.6时与廉价镜头画质差距被拉平
1
Sources
78%
Confidence
Long-term
Relevance
-
First Seen
Sources
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Unverified不建议为省钱买f/6.3以上小光圈超远摄变焦（如150-600mm廉价款）用于运动/鸟类连拍，暗光下对焦拉不动且快门速度受限，容易全程废片74% similarUnverified老机身或入门机身对焦系统弱时，不建议买f/8光圈的廉价超长焦，弱光和f/8下对焦会明显拉风箱，需确认机身对焦点在f/8下可用73% similarUnverified恒定光圈变焦（如100-400 f/4.5-5.6其实是变光圈，真正恒定如70-200 f/2.8）在弱光和虚化上占优，但重量和价格显著上升；日常旅拍变光圈超长焦更实用72% similarUnverified仅拍风光/建筑不建议购买70-200 f/2.8：风光多用小光圈且很少需要浅景深，f/4甚至变焦比更大的24-105更实用且更轻71% similar
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