tom_lusk

<p>I dug out my 300/4 after not using it for approx. 2 years, as a friend wanted to buy it.<br> When I put it away, it was working fine.<br> When I took it out, attached it to my D750, it would not auto-focus at all. I tried it on my old D300 and it eventually did auto focus, although it made some whining sounds for the first 10-15 seconds. Then it worked perfectly, focusing quickly, for approx. another 30 seconds. Then it quit. Manual focusing is fine, but not for the potential purchaser.<br> I cleaned the contacts, and tried it on the D750, D300 and D2x - nothing.<br> The lens is long out of warranty. Is there anything I can try before sending it in? <br> All help/suggestions much appreciated.</p>