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<blockquote data-quote="lokatz" data-source="post: 649101" data-attributes="member: 43924">Marro, If you allow me to chime in on &quot;slower&quot;:&nbsp; What is sometimes a bit sloppily referred to as lens speed has nothing to do with the speed of the lens itself, whatever that would be. Rather, it refers to how slow or fast the shutter speed of your camera needs to be in order to get a sufficient amount of light energy on your sensor.&nbsp; f/1.8 or f/2.8, which we often simply call 1.8 or 2.8, is the so-called maximum <a href="https://en.wikipedia.org/wiki/Aperture" target="_blank">aperture</a> of the lens.&nbsp; The value is an inverse number, so the smaller it is, the wider a lens can open and the more light it will let in.&nbsp; That is why a 1.8 lens is called faster than a 2.8 lens and a 1.4 lens is faster than a 1.8: since it allows more light to fall onto the sensor when the lens is wide open, the camera can close the shutter sooner, which means it uses a faster shutter speed.The differences between lenses can be significant: wide open, a 2.0 lens needs twice as much light as a 1.4 lens does, and a 2.8 lens needs four times as much as the 1.4 one!&nbsp; In broad daylight, this may not matter at all since you'll have plenty of light anyway.&nbsp; (There is another advantage of 'faster' lenses, though, which is a nicer 'bokeh' - look that one up if you're curious.)&nbsp; In dim light conditions, however, having a faster lens can make the difference between getting a great shot or shooting a blurry something that's best deleted right away. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" /></blockquote>

[QUOTE="lokatz, post: 649101, member: 43924"] Marro, If you allow me to chime in on "slower": What is sometimes a bit sloppily referred to as lens speed has nothing to do with the speed of the lens itself, whatever that would be. Rather, it refers to how slow or fast the shutter speed of your camera needs to be in order to get a sufficient amount of light energy on your sensor. f/1.8 or f/2.8, which we often simply call 1.8 or 2.8, is the so-called maximum [URL="https://en.wikipedia.org/wiki/Aperture"]aperture[/URL] of the lens. The value is an inverse number, so the smaller it is, the wider a lens can open and the more light it will let in. That is why a 1.8 lens is called faster than a 2.8 lens and a 1.4 lens is faster than a 1.8: since it allows more light to fall onto the sensor when the lens is wide open, the camera can close the shutter sooner, which means it uses a faster shutter speed. The differences between lenses can be significant: wide open, a 2.0 lens needs twice as much light as a 1.4 lens does, and a 2.8 lens needs four times as much as the 1.4 one! In broad daylight, this may not matter at all since you'll have plenty of light anyway. (There is another advantage of 'faster' lenses, though, which is a nicer 'bokeh' - look that one up if you're curious.) In dim light conditions, however, having a faster lens can make the difference between getting a great shot or shooting a blurry something that's best deleted right away. ;) [/QUOTE]

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