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My Tamron 70-300 I got with my D70 is 100% identical to the 70-300 Nikon of the same era other than the logo. The first time I heard it was on either Nikon Café or Nikonians. Wasn't the only lens model either from what was posted. If they still do it today I dunno.
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Got Tamron and Tokina lenses along with Nikon lenses. Really never had issues with the aftermarket ones. Yet to get a Sigma (thinking of the 200-500 for motorsports). Also a number of the Nikon branded "kit" lenses are made by Tamron.
I'm gonna need you to provide at least one credible source for this claim.
My Tamron 70-300 I got with my D70 is 100% identical to the 70-300 Nikon of the same era other than the logo. The first time I heard it was on either Nikon Café or Nikonians. Wasn't the only lens model either from what was posted. If they still do it today I dunno.
What you think you saw or what you read on a forum somewhere isn't a credible source. So..here's the actual truth:
Nikon has made their own lenses the vast majority of the time. There have been a few known and verifiable examples of them contracting stuff out (a few lenses back in the film days come to mind), but nothing credible that I can find relating to Tamron, and further, Tamron is only mentioned in this silly rumor and there has been no evidence to substantiate it.
The Tamron lens you're talking about does have a lot of similarities to the Nikon version, but the coatings are different, and the image quality is *very* different. The "Tamron makes Nikon's glass" rumor was mainly passed around by shifty salesmen trying to fool people. Sometimes (apparently) it worked. A more plausible explanation is that Tamron could have done what many companies do, copy someone else's stuff but change just enough to avoid getting lawyers involved. That's how the third party lensmakers survive. They have to reverse engineer the mounts and electronics just to make the lenses talk to the camera. Is it such a stretch that they wouldn't use a similar design internally?
I'm glad to see you posting and participating here in the forum, but we try to keep the information here as factual and relevant as we can. There are a lot of newbies that read here and come to learn stuff, crazy stories like this don't do much to help them out.