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Tamron 18-400mm f/3.5-6.3 Di II VC HLD Lens Focus Issues
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<blockquote data-quote="Horoscope Fish" data-source="post: 710442" data-attributes="member: 13090"><p>You can't upload raw files to the website because they're not image files, they're data files and they require hosting so we can download them and view them in a raw converter. In the future just using something like h**p://57web.com/vpix/nikon/SJV_2885.NEF would work if you don't want to insert a <a href="http://57web.com/vpix/nikon/SJV_2885.NEF" target="_blank">live link</a> into your post.</p><p></p><p>Anyway, I downloaded your image and I'm seeing two issues: motion blur and back-focus. The motion blur stems (ha!) most likely from the fact you were shooting at 400mm with a shutter speed of 1/320. What would have been better would have been a shutter speed of no less than the focal length and, really, a little bit over that; say 1/500 or better. </p><p></p><p>It's pretty clear to me though, based on that image, the lens is back-focusing. If you want to check it yourself I suggest reading this article:</p><p></p><p><a href="https://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues" target="_blank">How to Quickly Test Your DSLR for Autofocus Issues</a></p><p></p><p>My quick and dirty method for checking for front/back focus is to mount my camera on a tripod, set it to use a short shutter delay (two seconds or so) and then photograph a tape measure set at a 45 degree angle to the camera. I put the center focus-point on, for instance the 12" mark, and take a shot. If I see the 13" or 14" mark is more in focus than the 12 mark is, I've confirmed back-focus. Conversely if the 10 or 11 mark is more in focus than the 12 mark is, then I know I have a front-focus situation.</p><p></p><p>You can correct the back-focus by using the Tamron Tap-in Console or you can contact Tamron directly and have them do the focus-calibration for you. If you want to go the latter route they're going to want both the lens <em>and</em> the camera body so the lens can be calibrated specifically to the camera body it will be used on. Turn around time for this service is usually three days and the cost of calibration will be covered under warranty.</p><p></p><p></p><p><span style="color: #FFFFFF">...</span></p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 710442, member: 13090"] You can't upload raw files to the website because they're not image files, they're data files and they require hosting so we can download them and view them in a raw converter. In the future just using something like h**p://57web.com/vpix/nikon/SJV_2885.NEF would work if you don't want to insert a [url=http://57web.com/vpix/nikon/SJV_2885.NEF]live link[/url] into your post. Anyway, I downloaded your image and I'm seeing two issues: motion blur and back-focus. The motion blur stems (ha!) most likely from the fact you were shooting at 400mm with a shutter speed of 1/320. What would have been better would have been a shutter speed of no less than the focal length and, really, a little bit over that; say 1/500 or better. It's pretty clear to me though, based on that image, the lens is back-focusing. If you want to check it yourself I suggest reading this article: [url=https://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues]How to Quickly Test Your DSLR for Autofocus Issues[/url] My quick and dirty method for checking for front/back focus is to mount my camera on a tripod, set it to use a short shutter delay (two seconds or so) and then photograph a tape measure set at a 45 degree angle to the camera. I put the center focus-point on, for instance the 12" mark, and take a shot. If I see the 13" or 14" mark is more in focus than the 12 mark is, I've confirmed back-focus. Conversely if the 10 or 11 mark is more in focus than the 12 mark is, then I know I have a front-focus situation. You can correct the back-focus by using the Tamron Tap-in Console or you can contact Tamron directly and have them do the focus-calibration for you. If you want to go the latter route they're going to want both the lens [I]and[/I] the camera body so the lens can be calibrated specifically to the camera body it will be used on. Turn around time for this service is usually three days and the cost of calibration will be covered under warranty. [COLOR="#FFFFFF"]...[/COLOR] [/QUOTE]
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Tamron 18-400mm f/3.5-6.3 Di II VC HLD Lens Focus Issues
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