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Photography Q&A
Why a 50mm Lens is your new Best Friend
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<blockquote data-quote="Fortkentdad" data-source="post: 529997" data-attributes="member: 24285"><p>There are many efforts to explain this F'ing thing. </p><p></p><p>Here is another that made a bit of sense to me, but comes from a page entitled: "A Tedious Explanation of the f/stop" by Matthew Cole <a href="http://www.uscoles.com/fstop.htm" target="_blank">A Tedious Explanation of the f/stop</a> </p><p></p><p></p><p></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px"><strong>F/Stops</strong></span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px">f/stops are a bit more confusing because the numbers appear so arbitrary. This is the standard sequence of f/stops from f/1.4 to f/22. Although it may not seem intuitive at first, in this sequence the f/1.4 setting lets in the most light while the f/22 setting lets in the least. Also, each of these f/stops has<em>precisely</em> the same halving/doubling relationship as the shutter speed sequence.</span></span></span></p><p><span style="font-size: 12px">1.4 2.0 2.8 4 5.6 8 11 16 22</span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px">On the face of it, going from f/4 to f/5.6 doesn't sound like halving the amount of light. What's more, 5.6 is a larger number and sounds like it ought to be more light, not less. Neither does f/4 to f/2.8 sound like doubling the amount of light. In fact, each of the numbers in this sequence is a halving/doubling of the amount of light from its immediate neighbours, just like the shutter speed settings are. Not only that, but it makes sense, as I shall show below.</span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px">The reason that both the halving and doubling and the smaller numbers mean more light things make sense is that <strong>the f/stop is a ratio</strong>. </span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px"></span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px"></span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px">So the difference between 1.4 and 2.0 is the same as 5.6 to 8. </span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px"></span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"><span style="font-size: 12px"></span><span style="font-family: 'Verdana'">For me a 50mm is one way to get a sharp faster lens into you bag without breaking the bank. </span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Avenir'"></span></span></p></blockquote><p></p>
[QUOTE="Fortkentdad, post: 529997, member: 24285"] There are many efforts to explain this F'ing thing. Here is another that made a bit of sense to me, but comes from a page entitled: "A Tedious Explanation of the f/stop" by Matthew Cole [url=http://www.uscoles.com/fstop.htm]A Tedious Explanation of the f/stop[/url] [COLOR=#000000][FONT=Avenir][SIZE=3][B]F/Stops[/B][/SIZE][/FONT][/COLOR] [COLOR=#000000][FONT=Avenir][SIZE=3]f/stops are a bit more confusing because the numbers appear so arbitrary. This is the standard sequence of f/stops from f/1.4 to f/22. Although it may not seem intuitive at first, in this sequence the f/1.4 setting lets in the most light while the f/22 setting lets in the least. Also, each of these f/stops has[I]precisely[/I] the same halving/doubling relationship as the shutter speed sequence.[/SIZE][/FONT][/COLOR] [SIZE=3]1.4 2.0 2.8 4 5.6 8 11 16 22[/SIZE] [COLOR=#000000][FONT=Avenir][SIZE=3]On the face of it, going from f/4 to f/5.6 doesn't sound like halving the amount of light. What's more, 5.6 is a larger number and sounds like it ought to be more light, not less. Neither does f/4 to f/2.8 sound like doubling the amount of light. In fact, each of the numbers in this sequence is a halving/doubling of the amount of light from its immediate neighbours, just like the shutter speed settings are. Not only that, but it makes sense, as I shall show below.[/SIZE][/FONT][/COLOR] [COLOR=#000000][FONT=Avenir][SIZE=3]The reason that both the halving and doubling and the smaller numbers mean more light things make sense is that [B]the f/stop is a ratio[/B]. So the difference between 1.4 and 2.0 is the same as 5.6 to 8. [/SIZE][FONT=Verdana]For me a 50mm is one way to get a sharp faster lens into you bag without breaking the bank. [/FONT] [/FONT][/COLOR] [SIZE=3][/SIZE] [/QUOTE]
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