Repair InformationPhotographic Equipment repairs and design manufacturing providing imaging solutions world widehttps://www.cameraclinic.com.au/index.php/en/repair-information/37-lenses2024-05-08T07:34:47+10:00Joomla! - Open Source Content Management Lens focus issues2020-06-04T08:44:08+10:002020-06-04T08:44:08+10:00https://www.cameraclinic.com.au/index.php/en/repair-information/37-lenses/147-lens-focus-issues<div class="feed-description"><p>
<span style="font-size:11px;"><strong>Images not sharp</strong></span></p>
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<span style="font-size:11px;">There are many factors for images not being sharp and exhibiting in many ways.</span></p>
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<strong><span style="font-size:11px;">Lenses</span></strong></p>
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</p>
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<span style="font-size:11px;">Back focusing. The focusing is locking on behind the subject</span></td>
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<span style="font-size:11px;">Forward focusing. The focusing is locking on in front of the subject</span></td>
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<span style="font-size:11px;">Edge to edge focus. The edges of the image will be soft.</span></td>
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<span style="font-size:11px;">Softness through out the range. This may be an indication of wear, in need of a calibration or a distortion in the lens assembly </span></td>
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<span style="font-size:11px;">The lens needs a focal calibration</span></td>
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<span style="font-size:11px;">Worn guide rollers</span></td>
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<span style="font-size:11px;">Impact damage</span></td>
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<span style="font-size:11px;">Dusty or smudged lens filter</span></td>
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</table>
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<img alt="" src="http://cameraclinic.com.au/images/IMPACT/P1050023.JPG" style="height: 113px; width: 200px;" /> <img alt="" src="http://cameraclinic.com.au/images/IMPACT/P1050026.JPG" style="height: 113px; width: 200px;" /></p>
<p>
<span style="font-size:11px;"> Lens guide rollers, when theses wear</span></p>
<p>
<span style="font-size:11px;"> out it creates sloppiness in the lens</span></p>
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<span style="font-size:11px;"> causing resolution issues</span></p>
<p>
</p>
<p>
<span style="font-size:11px;">Also see <a href="http://cameraclinic.com.au/index.php/en/?option=com_content&view=article&id=148:focus-issues&catid=34:digital-slr&Itemid=126">camera</a> focal issues</span></p>
</div><div class="feed-description"><p>
<span style="font-size:11px;"><strong>Images not sharp</strong></span></p>
<p>
</p>
<p>
<span style="font-size:11px;">There are many factors for images not being sharp and exhibiting in many ways.</span></p>
<p>
</p>
<p>
<strong><span style="font-size:11px;">Lenses</span></strong></p>
<p>
</p>
<table border="0" cellpadding="1" cellspacing="1" style="width: 500px">
<tbody>
<tr>
<td>
<span style="font-size:11px;">Back focusing. The focusing is locking on behind the subject</span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">Forward focusing. The focusing is locking on in front of the subject</span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">Edge to edge focus. The edges of the image will be soft.</span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">Softness through out the range. This may be an indication of wear, in need of a calibration or a distortion in the lens assembly </span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">The lens needs a focal calibration</span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">Worn guide rollers</span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">Impact damage</span></td>
</tr>
<tr>
<td>
<span style="font-size:11px;">Dusty or smudged lens filter</span></td>
</tr>
</tbody>
</table>
<p>
</p>
<p>
<img alt="" src="http://cameraclinic.com.au/images/IMPACT/P1050023.JPG" style="height: 113px; width: 200px;" /> <img alt="" src="http://cameraclinic.com.au/images/IMPACT/P1050026.JPG" style="height: 113px; width: 200px;" /></p>
<p>
<span style="font-size:11px;"> Lens guide rollers, when theses wear</span></p>
<p>
<span style="font-size:11px;"> out it creates sloppiness in the lens</span></p>
<p>
<span style="font-size:11px;"> causing resolution issues</span></p>
<p>
</p>
<p>
<span style="font-size:11px;">Also see <a href="http://cameraclinic.com.au/index.php/en/?option=com_content&view=article&id=148:focus-issues&catid=34:digital-slr&Itemid=126">camera</a> focal issues</span></p>
</div>Reducing wear on your lens mount2010-08-01T15:08:02+10:002010-08-01T15:08:02+10:00https://www.cameraclinic.com.au/index.php/en/repair-information/37-lenses/53-reducing-wear-on-your-lens-mount<div class="feed-description"><div>
<span style="font-size:11px;">Attaching, and removing, a lens on a camera causes frictional wear on the lens mount, and is made worse when sand and grit is wedged between camera and lens. </span></div>
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</div>
<div>
<span style="font-size:11px;">Metal mounts can produce swarf that enters the mirror chamber and become deposited on the CCD/CMOS imager resulting in spots on images, also the AF sensor can be affected by this swarf. The entry level lenses with plastic mounts do not produce swarf but can become rough and raspy. In any case, mount surfaces loose their smooth rotational movement. </span></div>
<div>
</div>
<div>
<img alt="" src="http://www.cameraclinic.com.au/images/stories/img_0032.jpg" style="border-width: 1px; border-style: solid; width: 175px; height: 134px;" /> <img alt="" src="http://www.cameraclinic.com.au/images/stories/img_0034.jpg" style="width: 179px; height: 134px; border-width: 1px; border-style: solid;" /> </div>
<div>
<img alt="" src="http://www.cameraclinic.com.au/images/stories/img_0037.jpg" style="border-width: 1px; border-style: solid; width: 174px; height: 135px;" /></div>
<div>
<span style="font-size:11px;"> </span></div>
<div>
<span style="font-size:11px;">Use a clean lint free cloth with a small amount of alcohol, methylated spirits or shellite to wipe the mount and contacts on both lens and body helps to reduce wear. A smear of grease will help reduce wear. Some professional DSLR cameras already have suitable grease applied on the mount as a countermeasure to wear.</span></div>
</div><div class="feed-description"><div>
<span style="font-size:11px;">Attaching, and removing, a lens on a camera causes frictional wear on the lens mount, and is made worse when sand and grit is wedged between camera and lens. </span></div>
<div>
</div>
<div>
<span style="font-size:11px;">Metal mounts can produce swarf that enters the mirror chamber and become deposited on the CCD/CMOS imager resulting in spots on images, also the AF sensor can be affected by this swarf. The entry level lenses with plastic mounts do not produce swarf but can become rough and raspy. In any case, mount surfaces loose their smooth rotational movement. </span></div>
<div>
</div>
<div>
<img alt="" src="http://www.cameraclinic.com.au/images/stories/img_0032.jpg" style="border-width: 1px; border-style: solid; width: 175px; height: 134px;" /> <img alt="" src="http://www.cameraclinic.com.au/images/stories/img_0034.jpg" style="width: 179px; height: 134px; border-width: 1px; border-style: solid;" /> </div>
<div>
<img alt="" src="http://www.cameraclinic.com.au/images/stories/img_0037.jpg" style="border-width: 1px; border-style: solid; width: 174px; height: 135px;" /></div>
<div>
<span style="font-size:11px;"> </span></div>
<div>
<span style="font-size:11px;">Use a clean lint free cloth with a small amount of alcohol, methylated spirits or shellite to wipe the mount and contacts on both lens and body helps to reduce wear. A smear of grease will help reduce wear. Some professional DSLR cameras already have suitable grease applied on the mount as a countermeasure to wear.</span></div>
</div>