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<blockquote data-quote="Whiskeyman" data-source="post: 650051" data-attributes="member: 13556">Well, to update y'all, I haven't purchased a 500 mm lens, and I've just really convinced myself that I shouldn't.&nbsp; I'm now seriously considering sending my 300 mm lens to Nikon USA for service and a tuneup to ensure that it is operating at its peak.&nbsp;&nbsp; If Nikon can get it performing optimally, and I can then utilize the teleconverters I own with very good results, I will have a &quot;600 mm f5.6 combo&quot;, as well as a &quot;420 mm f4 combo&quot;.&nbsp;&nbsp; Before I send it to Nikon, though, I'm going to let a local shop take a look at it for sharpness.&nbsp; I'm also going to give it another series of tests, including with the FoCal autofocus tuning software.If this works, I may spring for the TC-17 later, for a &quot;510 mm f4.8 combo&quot; and still have money left over for a D850 if I decide to get one later.Good grief, I'm so wishy-washy!!&nbsp; Maybe I'll upgrade my tripod, too!! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />WM</blockquote>

[QUOTE="Whiskeyman, post: 650051, member: 13556"] Well, to update y'all, I haven't purchased a 500 mm lens, and I've just really convinced myself that I shouldn't. I'm now seriously considering sending my 300 mm lens to Nikon USA for service and a tuneup to ensure that it is operating at its peak. If Nikon can get it performing optimally, and I can then utilize the teleconverters I own with very good results, I will have a "600 mm f5.6 combo", as well as a "420 mm f4 combo". Before I send it to Nikon, though, I'm going to let a local shop take a look at it for sharpness. I'm also going to give it another series of tests, including with the FoCal autofocus tuning software. If this works, I may spring for the TC-17 later, for a "510 mm f4.8 combo" and still have money left over for a D850 if I decide to get one later. Good grief, I'm so wishy-washy!! Maybe I'll upgrade my tripod, too!! :p WM [/QUOTE]

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