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Photography Q&A
Focus not sharp.
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<blockquote data-quote="Horoscope Fish" data-source="post: 490327" data-attributes="member: 13090"><p>Well first off, if you haven't calibrated your lenses I would strongly suggest you do so.</p><p></p><p>For a quick and dirty test you could shoot some test shots of a looong expanse of a tape measure on the floor. Be far enough away you can see a couple feet of the tape measure in the viewfinder. Use a tripod, ISO 100 and put the lens at the widest aperture. Then, very specifically focus the camera on a specific number, say the 36" mark, and take your shot. If the 30" mark looks sharper in you photo, you know you've got a front-focus issue. If the 41" mark looks sharper, you know you've got a back-focus situation.</p><p></p><p>The above steps are just a quick test but to do a PROPER test/calibration for this you'll need to be more precise. There are several methods but the simplest method is probably <a href="https://nikoneurope-en.custhelp.com/app/answers/detail/a_id/51633/~/how-to-use-the-af-fine-tune-function" target="_blank">THIS ONE</a> found on the Nikon Europe website. </p><p></p><p>Another popular route is the <a href="https://www.youtube.com/watch?v=7zE50jCUPhM" target="_blank">Dot Tune Method</a> (link goes to YouTube vid) or you can invest in a software based solution like <a href="http://www.reikan.co.uk/focalweb/" target="_blank">Reikan FoCal</a>.</p><p></p><p>Lastly, and before I forget... Yes, lens calibration is specific to the lens/body combination. </p><p><span style="color: #FFFFFF">....</span></p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 490327, member: 13090"] Well first off, if you haven't calibrated your lenses I would strongly suggest you do so. For a quick and dirty test you could shoot some test shots of a looong expanse of a tape measure on the floor. Be far enough away you can see a couple feet of the tape measure in the viewfinder. Use a tripod, ISO 100 and put the lens at the widest aperture. Then, very specifically focus the camera on a specific number, say the 36" mark, and take your shot. If the 30" mark looks sharper in you photo, you know you've got a front-focus issue. If the 41" mark looks sharper, you know you've got a back-focus situation. The above steps are just a quick test but to do a PROPER test/calibration for this you'll need to be more precise. There are several methods but the simplest method is probably [url=https://nikoneurope-en.custhelp.com/app/answers/detail/a_id/51633/~/how-to-use-the-af-fine-tune-function]THIS ONE[/URL] found on the Nikon Europe website. Another popular route is the [url=https://www.youtube.com/watch?v=7zE50jCUPhM]Dot Tune Method[/url] (link goes to YouTube vid) or you can invest in a software based solution like [url=http://www.reikan.co.uk/focalweb/]Reikan FoCal[/url]. Lastly, and before I forget... Yes, lens calibration is specific to the lens/body combination. [COLOR="#FFFFFF"]....[/COLOR] [/QUOTE]
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