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<blockquote data-quote="hark" data-source="post: 751578" data-attributes="member: 13196"><p>Although it's always been my intention to send in my 300mm f/4 PF for repair, now I've run into something else. It's missed focus no matter what even after I used the D500's ability to use the AF tuning feature. So out of curiosity I decided to try Peter7100's suggestion he mentioned in a different thread to see if would reset any electrical issues.</p><p></p><p>Afterwards the reset (not the typical reset people do to the shooting menu) offered quite a bit of improvement although not quite up to speed yet. BUT maybe I need to do the AF tuning again. It's at +7 right now, and perhaps I will increase that up to +9 to see if it helps.</p><p></p><p>Here are a couple of NEF's taken over the past two days. For whatever reason, they uploaded as being overexposed; however, in reality neither one is overexposed. If I could have anyone take a look and give me your impressions of sharpness, I'd appreciate it. Just remember this lens is paired with the Nikon 1.7x TC in these two files. </p><p></p><p>Do you think the sharpness can be improved further either by another AF tuning or by getting the lens repaired? </p><p></p><p><a href="https://www.dropbox.com/sh/fqpftpxek3lvavo/AADGTrYXhrc7BP16lQf68_Tka?dl=0" target="_blank">https://www.dropbox.com/sh/fqpftpxek3lvavo/AADGTrYXhrc7BP16lQf68_Tka?dl=0</a></p></blockquote><p></p>
[QUOTE="hark, post: 751578, member: 13196"] Although it's always been my intention to send in my 300mm f/4 PF for repair, now I've run into something else. It's missed focus no matter what even after I used the D500's ability to use the AF tuning feature. So out of curiosity I decided to try Peter7100's suggestion he mentioned in a different thread to see if would reset any electrical issues. Afterwards the reset (not the typical reset people do to the shooting menu) offered quite a bit of improvement although not quite up to speed yet. BUT maybe I need to do the AF tuning again. It's at +7 right now, and perhaps I will increase that up to +9 to see if it helps. Here are a couple of NEF's taken over the past two days. For whatever reason, they uploaded as being overexposed; however, in reality neither one is overexposed. If I could have anyone take a look and give me your impressions of sharpness, I'd appreciate it. Just remember this lens is paired with the Nikon 1.7x TC in these two files. Do you think the sharpness can be improved further either by another AF tuning or by getting the lens repaired? [URL]https://www.dropbox.com/sh/fqpftpxek3lvavo/AADGTrYXhrc7BP16lQf68_Tka?dl=0[/URL] [/QUOTE]
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