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<blockquote data-quote="yauman" data-source="post: 226917" data-attributes="member: 15418">Let me now address the lens issue.&nbsp; Nikon do publish specs, both mechanical and electrical for lens and peripheral makes to make lenses etc for their camera.&nbsp; But there a fundamental problem that after-market vendors like Tamron and Sigma that Nikon don't - specific design versus universal design.All Nikon care when they design and make their lenses is for them to work well with Nikon camera but that's not the case for Tamron, Sigma etc. Whenever they design their lenses, especially complex details like autofocus, aperture controls, etc, they have to make it more generic so that same lenses can, with minor interface modification made to work with Canon, Sony etc. So at best, they have to compromise, something Nikon don't have to. It's actually quite amazing and impressive that Sigma or Tamron can design lenses with so much intelligence built in that with some interface mods, made to work with different manufacturers bodies.&nbsp; So, if they fall short occasionally, it's understandable. The problem today is exacerbated with the ability of the manufacturer to send out &quot;firmware updates&quot; that can change the behavior of their camera bodies and interaction with the lens. When Nikon issues an update, they test it only for their own stuff and they only know that the update won't screw up their own lenses. If Tamron or Sigma tap into some special interface routines, it may not work properly after a firmware upgrade.&nbsp; Firmware updates and patches are the bane of all embedded system programers!</blockquote>

[QUOTE="yauman, post: 226917, member: 15418"] Let me now address the lens issue. Nikon do publish specs, both mechanical and electrical for lens and peripheral makes to make lenses etc for their camera. But there a fundamental problem that after-market vendors like Tamron and Sigma that Nikon don't - specific design versus universal design. All Nikon care when they design and make their lenses is for them to work well with Nikon camera but that's not the case for Tamron, Sigma etc. Whenever they design their lenses, especially complex details like autofocus, aperture controls, etc, they have to make it more generic so that same lenses can, with minor interface modification made to work with Canon, Sony etc. So at best, they have to compromise, something Nikon don't have to. It's actually quite amazing and impressive that Sigma or Tamron can design lenses with so much intelligence built in that with some interface mods, made to work with different manufacturers bodies. So, if they fall short occasionally, it's understandable. The problem today is exacerbated with the ability of the manufacturer to send out "firmware updates" that can change the behavior of their camera bodies and interaction with the lens. When Nikon issues an update, they test it only for their own stuff and they only know that the update won't screw up their own lenses. If Tamron or Sigma tap into some special interface routines, it may not work properly after a firmware upgrade. Firmware updates and patches are the bane of all embedded system programers! [/QUOTE]

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