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<blockquote data-quote="hark" data-source="post: 750321" data-attributes="member: 13196">I will be looking to send my 300mm f/4 PF to Nikon for repair this month. Both this lens as well as my 300mm f/4 non-VR lens are having AF issues. That said, I came across this image posted elsewhere online. I might have inadvertently used some of the other focus points because there have been times when both lenses hunted extensively. And that might have contributed to the AF problems. My TC is the TC-17E II coupled with&nbsp; f/4 lenses. There are just 15 focus points available to use with the 1.7x TC. Obviously I wasn't aware of this. Most times I use single point but sometimes move it around depending on where I'm trying to focus on my subjects. And I'm sure there were times I moved the focus point to outside those limited 15 points.So here's a question for anyone. When selecting the option to use 72-point dynamic-area AF, would the camera know only to choose these specific 15 points? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused&nbsp; &nbsp; :confused:" loading="lazy" data-shortname=":confused:" /> Sometimes I switch it up and use the 72 points option.*I believe this chart came from the D750 owner's manual but might be applicable to other bodies. [ATTACH=full]350676[/ATTACH]</blockquote>

[QUOTE="hark, post: 750321, member: 13196"] I will be looking to send my 300mm f/4 PF to Nikon for repair this month. Both this lens as well as my 300mm f/4 non-VR lens are having AF issues. That said, I came across this image posted elsewhere online. I might have inadvertently used some of the other focus points because there have been times when both lenses hunted extensively. And that might have contributed to the AF problems. My TC is the TC-17E II coupled with f/4 lenses. There are just 15 focus points available to use with the 1.7x TC. Obviously I wasn't aware of this. Most times I use single point but sometimes move it around depending on where I'm trying to focus on my subjects. And I'm sure there were times I moved the focus point to outside those limited 15 points. So here's a question for anyone. When selecting the option to use 72-point dynamic-area AF, would the camera know only to choose these specific 15 points? :confused: Sometimes I switch it up and use the 72 points option. *I believe this chart came from the D750 owner's manual but might be applicable to other bodies. [ATTACH type="full" width="60%"]350676._xfImport[/ATTACH] [/QUOTE]

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