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Message: <blockquote data-quote="SkvLTD" data-source="post: 297008" data-attributes="member: 12855">Like shopping for cars. You can buy car A or B and the only differences between them is auto/manual transmission and front/rear wheel drive. IF you have NO idea what the technical difference is and thus have no particular preference, it's really all the same to you. Both cars will let you drive from point to point about equally the same unless you can make use of their differences.My own personal example, Nikkor-H 50/2: 6 elements in 4 groups Nikkor 45/2.8 AI-P: 4 elements in 3 groupsSay aperture is the same, difference in blades is negligible, etc etc. Since the original 45/2.8 wasn't too far from the 50 H, let's say that their technological level is about the same as well (since other equally thin lenses have come out since with much more complex designs).It all comes down to how light passes through all that glass: how prone it is to flare and how the flare looks; whether corners are sharp or softer; and then we have physical size and weight. Another factor could be ability to focus closer than the competitors and that's all governed by the internal design.I, won't ask how you're semi-pro in experience without knowing these kinds of basics since I know quite a few people who can make really nice pictures with the sole knowledge that shutter buttons makes the picture happen using camera with some lens attached.</blockquote>