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Message: <blockquote data-quote="PhotoAV8R" data-source="post: 99027" data-attributes="member: 939">It's not the physical size of the front element that determines the low light performance of the lens; it's the aperture (ratio of front element diameter to focal length). Somebody is in error: the Writer, the Reader, or Me. Me thinks you need to re-read what you read, or post a link to it here.Both lenses have an aperture range of f/4.5-5.6. Since the range of focal length is different (50-300 vs. 70-300), there may be small differences at any particular focal length. However, I would think the light-gathering performance is pretty much the same for both lenses.BWTHDIK</blockquote>