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Nikon's New 300mm f/4 Looks Impressive
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<blockquote data-quote="Bengt Nyman" data-source="post: 458250" data-attributes="member: 13692"><p>No doubt there is some quality loss using TCs. I keep asking Nasim to use his Imatest capability to quantify it.</p><p>Of course a TC spreads and thereby reduces the light received by the sensor. However, why would that impair the AF speed compared to a non TC lens at the same effective aperture ?</p><p>I presently use the 300 mm f/4 D with the TC14 and crop to reach. I'm on a waiting list for the 300 mm f/4 PF VR.</p><p>My problem is that the TC14 III lacks the mechanical aperture connection, forcing you to shoot at lens aperture f/5.6.</p><p>The 300 mm f/4 PC VR would certainly solve that.</p></blockquote><p></p>
[QUOTE="Bengt Nyman, post: 458250, member: 13692"] No doubt there is some quality loss using TCs. I keep asking Nasim to use his Imatest capability to quantify it. Of course a TC spreads and thereby reduces the light received by the sensor. However, why would that impair the AF speed compared to a non TC lens at the same effective aperture ? I presently use the 300 mm f/4 D with the TC14 and crop to reach. I'm on a waiting list for the 300 mm f/4 PF VR. My problem is that the TC14 III lacks the mechanical aperture connection, forcing you to shoot at lens aperture f/5.6. The 300 mm f/4 PC VR would certainly solve that. [/QUOTE]
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Nikon's New 300mm f/4 Looks Impressive
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