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<blockquote data-quote="BackdoorArts" data-source="post: 221620" data-attributes="member: 9240">That seems awful strange that image review would be impacted by the lens on the camera, but who knows.If there's playing going on it's not just Nikon.&nbsp; My brother is a pro shooter and has the new Sigma 120-300mm.&nbsp; He loves it, and it shoots with Canon 1DX and 5D Mk III cameras for work.&nbsp; With the 5D the lens works perfectly, but with the 1DX the focus goes off between 200-300mm.&nbsp; He had the exact same problem with the previous generation lens.&nbsp; He spent a ton of time with reps from both Canon and Sigma at the Photoplus Expo last month and was invited by the Sigma rep to bring his lens and all his cameras to their Long Island facility for examination.&nbsp; Long story short, it seems that the 1D's have a different focusing system than all other Canon bodies (source info from a Canon rep), and that 3rd party lens manufacturers may not exhaustively test all lenses (his other Sigmas all work great on the 1D).&nbsp; Sigma was able to fine tune the lens somewhat but it still wasn't perfect, so they sent off numbers to their team in Japan.&nbsp; He just heard from Sigma on Monday and they are custom calibrating a new 120-300mm for him and he should have it shortly.&nbsp; Now that is customer service. So, are these issues intentional with Nikon and Canon?&nbsp; Who knows?!&nbsp; I honestly can't see engineers putting bugs in firmware that &quot;breaks&quot; the camera when other brand lenses are attached, but I also can't see them also testing to make sure changes in operating software work with lenses other than their own.</blockquote>

[QUOTE="BackdoorArts, post: 221620, member: 9240"] That seems awful strange that image review would be impacted by the lens on the camera, but who knows. If there's playing going on it's not just Nikon. My brother is a pro shooter and has the new Sigma 120-300mm. He loves it, and it shoots with Canon 1DX and 5D Mk III cameras for work. With the 5D the lens works perfectly, but with the 1DX the focus goes off between 200-300mm. He had the exact same problem with the previous generation lens. He spent a ton of time with reps from both Canon and Sigma at the Photoplus Expo last month and was invited by the Sigma rep to bring his lens and all his cameras to their Long Island facility for examination. Long story short, it seems that the 1D's have a different focusing system than all other Canon bodies (source info from a Canon rep), and that 3rd party lens manufacturers may not exhaustively test all lenses (his other Sigmas all work great on the 1D). Sigma was able to fine tune the lens somewhat but it still wasn't perfect, so they sent off numbers to their team in Japan. He just heard from Sigma on Monday and they are custom calibrating a new 120-300mm for him and he should have it shortly. Now [I]that[/I] is customer service. So, are these issues intentional with Nikon and Canon? Who knows?! I honestly can't see engineers putting bugs in firmware that "breaks" the camera when other brand lenses are attached, but I also can't see them also testing to make sure changes in operating software work with lenses other than their own. [/QUOTE]

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