kk_hui

<p>For a sharp all purpose zoom for D7200 I'd recommend the AF-S DX 18-140/3.5-5.6G ED VR.</p>

<p>Jon,<br> After much research I ended up with Tokina AT-X 16-28 PRO FX for use with my D800 and don't look back. It's a very sharp lens with relatively low distortion. Yes it's heavy at 950g but excellent built.</p>

<p>Tim,<br> If you're looking for a 28mm to pair with D800 I'd suggest the AF-S28/1.8G which is a super sharp lens. I've the exact combo and am very pleased with it.</p>

<p>For serious bird photography I'd suggest going for AF-S 500/4, 1.4x TC and APSC DSLR such as D7100/ D7200 plus a sturdy tripod. For hand-held flight shots 400 would be the minimum and that can be achieved with AF-S 300/4 + 1.4x TC.</p>

<p>I downloaded the Distortion Control Data Ver. L: 2.005 but notice that the file size, 29kB, is much less that the last version.Wonder if this is correct?!<br />NKLD01009.BIN - 59kB (last version)<br />NKLD02005.BIN - 29kB</p>

<p>Thanks, Shun!<br> Indeed the same TC14E is used with my 300/4 and 500/4. All the symptom appears to be pointing to a D7100 problem when coupled to the specific lenses viz AF-S 300/4D and AF-S 80-200/2.8D. I've not call Nikon repair yet.</p>

<p>I encounter intermittent AF failures (AF just went dead) on my D7100 with the captioned lenses viz AF-S 300/4D (with or without TC14E) and AF-S 80-200/2.8D straight. Both lenses works flawlessly with my other bodies D200 and D800.<br /><br />My D7100 has no AF issue with my AF-S 500/4D (with or without TC14E) and other lenses including the AF-S 28/1.8G and AF-S 300/2.8D (with or without TC14E and TC20E).<br /><br />I've visually checked for lenses alignment, physical fitting and pin contacts (height) and they both appear normal. Contacts were cleaned but to no avail. All screws on both the lenses/ TCs and body mount were checked also. They are all tight and none of them are loose in anyway. I even blow clean the AF sensor located at the bottom and behind the mirror on my D7100.<br />It doesn't make a difference unfortunately. I cannot loose the idea that it's a matter of tolerances on the contacts and D7100 is less tolerable (tight spec?); just a little bit too much space causing the AF pins to loose contact. By twisting the lens within its play I can sometime get its AF to work again but not always ...<br> Or could there be firmware bug(s) in the D7100?<br /><br />Wonder if it's an unique pairing/ compatibility problem?<br />Your experience and insight on these combos?</p>