{"id":1031,"date":"2017-04-10T12:49:04","date_gmt":"2017-04-10T16:49:04","guid":{"rendered":"http:\/\/jrileystewart.com\/blog\/?p=1031"},"modified":"2022-09-21T09:08:17","modified_gmt":"2022-09-21T13:08:17","slug":"easily-verify-the-focus-on-your-flatbed-scanner","status":"publish","type":"post","link":"https:\/\/www.jrileystewart.com\/blog\/easily-verify-the-focus-on-your-flatbed-scanner\/","title":{"rendered":"Easily verify the focus on your flatbed scanner"},"content":{"rendered":"<p><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1108\" src=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2018\/03\/Screen-Shot-2018-03-02-at-12.12.38-PM-2942642073-1545917836338.png\" alt=\"Wet Mounting on the Epson V700 V750 V800 V850\" width=\"598\" height=\"372\" srcset=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2018\/03\/Screen-Shot-2018-03-02-at-12.12.38-PM-2942642073-1545917836338.png 598w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2018\/03\/Screen-Shot-2018-03-02-at-12.12.38-PM-2942642073-1545917836338-300x187.png 300w\" sizes=\"auto, (max-width: 598px) 100vw, 598px\" \/><\/span><\/p>\n<p><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\">This article describes a way to make sure the placement of negatives above your scanner&#8217;s platen is within the depth of field of your scanner&#8217;s lens for best sharpness.<\/span><\/p>\n<p>If your film holders don&#8217;t place the film where the scanner focuses its lens, then you&#8217;re going to get fuzzy images. And that may be causing you to pull your hair out. Neither are good situations to find yourself in.<\/p>\n<hr \/>\n<p><strong>Now, let&#8217;s talk about checking the focus of your scanner.<\/strong><\/p>\n<p>Many flatbed scanners have a fixed focal distance set by the manufacturer, and they provide holders that place the negative &#8220;precisely&#8221; at that distance. \u00a0Most of the time, this works well.<\/p>\n<p>But there are times when you might suspect that the fixed focus (or even auto focus) isn&#8217;t behaving right. If you are getting consistently blurry scans or scans that you believe should be sharp and aren&#8217;t, you may have a scanner that isn&#8217;t focusing precisely, or a holder that isn&#8217;t placing the negative where the lens is focusing.<\/p>\n<p>In this short article, I&#8217;ll show you an easy way to verify the depth of field on your flatbed scanner&#8217;s lens.\u00a0 Then, you can take steps to make sure your negative carrier places negatives precisely at the optimum distance above the scanner platen for maximum sharpness and resolution.<\/p>\n<p>To verify the focusing capability of your flatbed scanner, all you&#8217;ll need is a transparent ruler and a second ruler to measure with.<\/p>\n<p>I&#8217;ll be using the Epson V700\/V800 for this instruction, but the procedures should work for any flatbed scanner.<\/p>\n<h3>Concept<\/h3>\n<p>Like any lens, your scanner&#8217;s lens has a range of acceptable focus, or depth of field (DOF) where it performs best.\u00a0 You can determine DOF by scanning a transparent ruler that has been placed on an incline, with one end well below the minimum DOF height and the other end placed well above the maximum DOF height. The graduations on the scanned image of the transparent ruler will be sharp within the scanner&#8217;s DOF.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1619 size-full\" src=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/Screen-Shot-2020-06-30-at-10.29.33-AM.jpg\" alt=\"\" width=\"641\" height=\"271\" srcset=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/Screen-Shot-2020-06-30-at-10.29.33-AM.jpg 641w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/Screen-Shot-2020-06-30-at-10.29.33-AM-300x127.jpg 300w\" sizes=\"auto, (max-width: 641px) 100vw, 641px\" \/><\/p>\n<h2>Procedure<\/h2>\n<ol>\n<li>The first step is to place the transparent ruler on an incline relative to the scanner platen. In the following picture, I placed one end of the ruler on the platen and placed the other end of the ruler to rest on the top of the scanner bed, shimmed by approximately 1\/4&#8243;.\u00a0\u00a0 Shimming the elevated end of the ruler will steepen the incline and help differentiate the sharpness along the entire length of the ruler.\u00a0 <span style=\"text-decoration: underline;\"><em>It&#8217;s important to check that when you lower the lid on the scanner that you don&#8217;t move or warp the ruler. You don&#8217;t need to lower the lid all the way; just close it enough to avoid touching the end of the ruler.<\/em>\u00a0<\/span> Now, open the lid and tape each end of the ruler down to avoid movement during scanning.\n<p><figure id=\"attachment_1980\" aria-describedby=\"caption-attachment-1980\" style=\"width: 713px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1980\" src=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/scanner-ruler.png\" alt=\"\" width=\"713\" height=\"412\" srcset=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/scanner-ruler.png 1399w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/scanner-ruler-300x173.png 300w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/scanner-ruler-1024x592.png 1024w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/scanner-ruler-768x444.png 768w\" sizes=\"auto, (max-width: 713px) 100vw, 713px\" \/><figcaption id=\"caption-attachment-1980\" class=\"wp-caption-text\">Shows the inclined placement of the transparent ruler on the V700 platen. The upper end is shimmed to increase the steepness of the incline. The white sheet of paper is only for illustration purposes so you can &#8216;see&#8217; the scanner&#8217;s glass platen in this illustration (it&#8217;s not used during the actual scan).<\/figcaption><\/figure><\/li>\n<\/ol>\n<ol>\n<li>Scan the ruler using your normal scanning settings (i.e., high resolution, 2400 ppi) without sharpening, and open the file in your photo viewing software, like Preview, Photoshop, or Lightroom. Do not move the transparent ruler yet; you&#8217;ll need it in exactly the same location in Step 4.<\/li>\n<li>On the scanned image, examine the ruler along its entire length, looking for the sharpest delineation of the numbers on the ruler. There should be a range of numbers\/graduations that will be sharper than anywhere else along the ruler. If your scanner&#8217;s depth of field is very wide, you may not see any difference in sharpness along the ruler. This is good, because it means you shouldn&#8217;t be experiencing out of focus situation no matter where the negative is placed above the platen. But you need to examine closely to rule out minor differences in sharpness as you examine along the length of the ruler. \u00a0In my example below, maximum sharpness was seen about 23-24 cm on the ruler, call it 23.5 cm. The differences in sharpness between 0 and 4 inches on this image is difficult to show, but careful inspection at 50% in Preview clearly shows the difference.\u00a0 You should see a clear difference. <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-1032\" src=\"https:\/\/jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/V700FocusTest003-1024x248.jpg\" alt=\"V700FocusTest003\" width=\"584\" height=\"141\" srcset=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/V700FocusTest003-1024x248.jpg 1024w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/V700FocusTest003-300x73.jpg 300w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/V700FocusTest003-768x186.jpg 768w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/V700FocusTest003-500x121.jpg 500w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/li>\n<li>Now you need to determine the distance above the platen where you found the sharpest graduations on the ruler. Use a different ruler for this step. A micrometer may also be used if you have one, but you don&#8217;t need that much precision. I used a simple wooden ruler that \u00a0began graduations at the very end of the ruler. So, at the point on the transparent ruler (still resting on the scanner) where I found maximum resolution, I measured the distance above the platen surface and found it to be 1\/8&#8243;. Your results may vary. \u00a0This measurement told me that my scanner&#8217;s best performance was 1\/8&#8243; above the platen. <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-1035\" src=\"https:\/\/jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2946-1024x768.jpg\" alt=\"IMG_2946\" width=\"584\" height=\"438\" srcset=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2946-1024x768.jpg 1024w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2946-300x225.jpg 300w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2946-768x576.jpg 768w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2946-400x300.jpg 400w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/li>\n<li>\u00a0Now compare this distance to the height of the negative plane on your negative holder to see if your holder is placing the negative where the scanner has its maximum resolution. First place your negative holder on a flat hard surface (e.g. a table top) and find\u00a0the lip on the holder that holds the negative during scanning. Measure the distance from the table top\u00a0to the top of the lip. This tells you exactly where your holder is placing the negative during scanning.\u00a0<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-1036\" src=\"https:\/\/jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2978-copy-1024x990.jpg\" alt=\"IMG_2978 copy\" width=\"584\" height=\"565\" srcset=\"https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2978-copy-1024x990.jpg 1024w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2978-copy-300x290.jpg 300w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2978-copy-768x742.jpg 768w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2978-copy-310x300.jpg 310w, https:\/\/www.jrileystewart.com\/blog\/wp-content\/uploads\/2017\/04\/IMG_2978-copy.jpg 1945w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/li>\n<li>\n<h4>Interpretation<\/h4>\n<p>If you&#8217;re lucky, the height measured in Step 5 is exactly the same as the height measured in Step 4. It means your holder is placing the negative exactly where the scanner lens is focusing.<\/p>\n<p>If the holder doesn&#8217;t place the negative within an acceptable distance for the scanner&#8217;s lens, you&#8217;ll need to modify your holder or change to a holder that does. The Epson holder comes with adjusting feet; merely changing the setting on the feet may fix the problem.<\/p>\n<p>For the vast majority of scanners, the distance you find is sharpest will be very close to the distance measured on the negative carrier. But this quick test of focus on your scanner should at least confirm that scanner focusing is or is not optimal, and you can take actions to fix it.<\/p>\n<p>It&#8217;s possible that after doing this test, you find that there is no region of perfect sharpness along the entire length of the transparent ruler. There are two possible reasons: 1. the ruler moved or deflected during the scan when the lid is closed (re-read Step 1 in Procedures above), or the scanner&#8217;s lens is faulty and you may need to replace or repair the scanner.<\/li>\n<\/ol>\n<p><strong>Bonus utility:<\/strong> I used this test to determine where my custom negative carrier had to sit for maximum sharpness. I modified my scanner to accommodate a <a href=\"http:\/\/Scan transparent ruler and determine lowest and highest distances\">wet-mount under-mount design<\/a>, and knowing my scanner&#8217;s specific DOF told me how much shimming I had to do for correct placement of the negative in this custom carrier. We&#8217;re not constrained to using the manufacturer&#8217;s film carriers once we know the scanner&#8217;s true DOF.<\/p>\n<h3>What does it mean when the negative is placed optimally, but the scans still appear &#8216;fuzzy?&#8217;<\/h3>\n<p><span style=\"text-decoration: underline;\">First, make sure your shooting technique is perfect.<\/span>\u00a0 Barring the case where the scanner is not functioning properly, finding that your images still appear unsharp most likely suggests a fault in technique. BY FAR, this will be the cause of unsharp images (i.e., not the scanner). It&#8217;s been the same since the the advent of modern cameras and lenses; it&#8217;s not the tools but the technique that causes most situations of unsharp images. You already know this, right?\u00a0 Do you use a tripod when sharpness is important to the image? Do you practice appropriate aperture\/shutter speed relative to subject motion? Technique remains one of the most important factors in acquiring an image on the negative that is sharp or not sharp. It&#8217;s always been that way.<\/p>\n<p>Second, make sure to minimize your subjective bias toward those hyper-acute images shot with modern digital cameras. I suspect this bias is a leading cause for people new to film\u00a0\u00a0 thinking their scans are &#8216;blurry.&#8217; This topic is probably worth a separate article; because it took me a couple years after returning to film scanning after a year shooting with digital to realize that comparing the two technologies is an apples and oranges comparison. In short, never compare a 1:1 depiction of a digital image to a 1:1 depiction of a scanned image unless the two images are exactly the same resolution (i.e., 20 MP to 20 MP), and even that is a stretch.\u00a0 The best evaluation of sharpness for a film scan is by looking at an appropriately sized print, not a file on your computer monitor.\u00a0 Don&#8217;t toss your scanner or give up on shooting film before making a print comparison!<\/p>\n<p>I hope this article helps you determine whether your scanner is functioning properly, and how to determine where the optimum focal point of your scanner&#8217;s lens is.\u00a0 Feel free to ask questions.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Let me hear your questions or comments below.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article provides a quick method to verify that your flatbed scanner and negative carrier are working together to ensure the sharpest scan possible. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[175,170,293,295,11,272,300],"class_list":["post-1031","post","type-post","status-publish","format-standard","hentry","category-techniques","tag-analog-photography","tag-art-photography","tag-better-scanning","tag-epson-v700","tag-film-photography","tag-film-scanning","tag-photographic-negative-scanning"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Easily verify the focus on your flatbed scanner - Thoughts on the Craft of Fine Art Photography<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.jrileystewart.com\/blog\/easily-verify-the-focus-on-your-flatbed-scanner\/\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.jrileystewart.com\\\/blog\\\/easily-verify-the-focus-on-your-flatbed-scanner\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.jrileystewart.com\\\/blog\\\/easily-verify-the-focus-on-your-flatbed-scanner\\\/\"},\"author\":{\"name\":\"J. 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