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<blockquote data-quote="Whiskeyman" data-source="post: 238278" data-attributes="member: 13556">The difference between an f/1.4 lens and a 1.8 lens is about one-half a stop (.65 is closer to it).&nbsp; So, all other things being equal, you can use a shutter speed about 65% faster with the f/1.4 than the f/1.8 at max aperture.&nbsp; And, with all else equal, the depth of field of the f/1.4 is less than the f/1.8.&nbsp; When I purchased my 50mm and 85 mm lenses, I went with the f/1.8 versions, and will do the same when I purchase a 35 mm prime, because the above trade-offs weren't worth the greater lens prices to me.&nbsp; Even though I shoot a lot in low-light situations, the loss of depth of field isn't worth the extra speed that I get with the f/1.4.&nbsp; I just raise my ISO a stop and use a monopod.If you go with FX (full-frame) lenses, there is another supposed advantage over DX:&nbsp; the DX sensor utilizes the center of the lenses projected image, which is sometimes call the &quot;sweet spot&quot; due to its superior image qualities.</blockquote>

[QUOTE="Whiskeyman, post: 238278, member: 13556"] The difference between an f/1.4 lens and a 1.8 lens is about one-half a stop (.65 is closer to it). So, all other things being equal, you can use a shutter speed about 65% faster with the f/1.4 than the f/1.8 at max aperture. And, with all else equal, the depth of field of the f/1.4 is less than the f/1.8. When I purchased my 50mm and 85 mm lenses, I went with the f/1.8 versions, and will do the same when I purchase a 35 mm prime, because the above trade-offs weren't worth the greater lens prices to me. Even though I shoot a lot in low-light situations, the loss of depth of field isn't worth the extra speed that I get with the f/1.4. I just raise my ISO a stop and use a monopod. If you go with FX (full-frame) lenses, there is another supposed advantage over DX: the DX sensor utilizes the center of the lenses projected image, which is sometimes call the "sweet spot" due to its superior image qualities. [/QUOTE]

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