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<blockquote data-quote="jay_dean" data-source="post: 594599" data-attributes="member: 34040">If, for example you take a Nikon 300mm f/4 and compare it to a Nikon 300mm f/2.8 there is a huge price difference, and on paper for what? one stop and a bit of dof, for the same focal length? Many modern cameras can handle one stop difference, so the f/4 looks like a bargain at few hundred over several thousand (£'s/$'s Euros..whatever.)That several thousand difference is basically down to two factors. Build and performance. If you place them side by side the first difference is size. The f/4 is compact, and lightweight, the f/2.8 is a good twice the size and much much heavier, due to larger glass elements, better case and add to that waterproof over the f/4 being water resistant. The f/2.8 has a professional build to do a professional job (if need be)Secondly is performance. The f2.8 is much faster and optically superior, which to many people is a crucial part of their photography.So, there is a bit more to it than just one stop and a bit o' dof. Its just is the expense worth it to you?</blockquote>

[QUOTE="jay_dean, post: 594599, member: 34040"] If, for example you take a Nikon 300mm f/4 and compare it to a Nikon 300mm f/2.8 there is a huge price difference, and on paper for what? one stop and a bit of dof, for the same focal length? Many modern cameras can handle one stop difference, so the f/4 looks like a bargain at few hundred over several thousand (£'s/$'s Euros..whatever.) That several thousand difference is basically down to two factors. Build and performance. If you place them side by side the first difference is size. The f/4 is compact, and lightweight, the f/2.8 is a good twice the size and much much heavier, due to larger glass elements, better case and add to that waterproof over the f/4 being water resistant. The f/2.8 has a professional build to do a professional job (if need be) Secondly is performance. The f2.8 is much faster and optically superior, which to many people is a crucial part of their photography. So, there is a bit more to it than just one stop and a bit o' dof. Its just is the expense worth it to you? [/QUOTE]

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