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<blockquote data-quote="BackdoorArts" data-source="post: 523181" data-attributes="member: 9240">I just looked in my active LR catalog which currently contains the last 4 months of 2015 photos.&nbsp; In it there are 945 photos taken with the 24-120mm f4 (it lives on my FX cameras).&nbsp; Almost half (451) of the photos were taken at ISO 100.&nbsp; Only about 10% were taken at ISO levels above 6400, and in those cases it had more to do with the aperture I needed to shoot (above f8) than available light.&nbsp; I say this to dispel the idea that an f4 lens somehow requires you to shoot at high ISO levels.&nbsp; That's just plain nuts.&nbsp; It's one stop less bright, so you've got one add'l stop of required ISO over your f2.8 lens.&nbsp; It's plenty sharp wide open, but yes it gets better at f5.6.&nbsp; It also saves you a wad of cash and weight if you don't want to spring for the 24-70mm f2.8, and it's got that extra reach that will keep you from wondering if you should have brought the 70-200mm with you as well.&nbsp; Perfect walkaround lens on a FX body, and a great lens on DX if you're looking to do candid street portraits or something similar.</blockquote>

[QUOTE="BackdoorArts, post: 523181, member: 9240"] I just looked in my active LR catalog which currently contains the last 4 months of 2015 photos. In it there are 945 photos taken with the 24-120mm f4 (it lives on my FX cameras). Almost half (451) of the photos were taken at ISO 100. Only about 10% were taken at ISO levels above 6400, and in those cases it had more to do with the aperture I needed to shoot (above f8) than available light. I say this to dispel the idea that an f4 lens somehow requires you to shoot at high ISO levels. That's just plain nuts. It's one stop less bright, so you've got one add'l stop of required ISO over your f2.8 lens. It's plenty sharp wide open, but yes it gets better at f5.6. It also saves you a wad of cash and weight if you don't want to spring for the 24-70mm f2.8, and it's got that extra reach that will keep you from wondering if you should have brought the 70-200mm with you as well. Perfect walkaround lens on a FX body, and a great lens on DX if you're looking to do candid street portraits or something similar. [/QUOTE]

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