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Nikon's New 300mm f/4 Looks Impressive
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<blockquote data-quote="Bengt Nyman" data-source="post: 470760" data-attributes="member: 13692"><p>OK. Reliable resolution or sharpness tests requires the right equipment and rigorous discipline. The idea of two homemade tests, performed by two different people to compare the sharpness of two different lenses is totally impractical. If somebody has access to both lenses and has the patience to rig up a comparative test using the same camera on tripod, with remote trigger, in live view, he or she might be able to see a difference. After all, That's what LenScore did, reporting a resolving power of 1189 for the conventional optics and 924 for the diffraction optics. Unfortunately I have not heard of any other credible comparison. I have asked LensTip, twice, if they have or would consider testing the conventional Nikon 400mm F4 lens but they have not answered. DxO has not tested the old lens but has announced that they will test the new one some time in the future. However, without comparable data on the old one we are back guessing again.</p><p></p><p>When we buy baby formula or cars we know what we get, but for some reason lens manufacturers are allowed to keep it a secret. Lens manufacturers should publish an approximate max center resolution of their lenses expressed in LP/mm and an MTF chart at max resolution and at for example 40 LP/mm.</p><p>MTF charts at 10, 20 or even 30 LP/mm are nothing but advertising material. </p><p> </p><p>Zuiko Olympus, for example, publishes MTF charts at 20 and 60 LP/MM. No guessing required there.</p></blockquote><p></p>
[QUOTE="Bengt Nyman, post: 470760, member: 13692"] OK. Reliable resolution or sharpness tests requires the right equipment and rigorous discipline. The idea of two homemade tests, performed by two different people to compare the sharpness of two different lenses is totally impractical. If somebody has access to both lenses and has the patience to rig up a comparative test using the same camera on tripod, with remote trigger, in live view, he or she might be able to see a difference. After all, That's what LenScore did, reporting a resolving power of 1189 for the conventional optics and 924 for the diffraction optics. Unfortunately I have not heard of any other credible comparison. I have asked LensTip, twice, if they have or would consider testing the conventional Nikon 400mm F4 lens but they have not answered. DxO has not tested the old lens but has announced that they will test the new one some time in the future. However, without comparable data on the old one we are back guessing again. When we buy baby formula or cars we know what we get, but for some reason lens manufacturers are allowed to keep it a secret. Lens manufacturers should publish an approximate max center resolution of their lenses expressed in LP/mm and an MTF chart at max resolution and at for example 40 LP/mm. MTF charts at 10, 20 or even 30 LP/mm are nothing but advertising material. Zuiko Olympus, for example, publishes MTF charts at 20 and 60 LP/MM. No guessing required there. [/QUOTE]
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Nikon's New 300mm f/4 Looks Impressive
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