{"id":55625,"date":"2025-07-03T16:25:05","date_gmt":"2025-07-03T20:25:05","guid":{"rendered":"https:\/\/www.keh.com\/expert-advice\/?p=55625"},"modified":"2025-07-03T16:25:06","modified_gmt":"2025-07-03T20:25:06","slug":"how-to-check-a-used-lens-for-dust-mold-and-scratches-5-tips-every-photographer-should-know","status":"publish","type":"post","link":"https:\/\/www.keh.com\/expert-advice\/photography\/education\/how-to-check-a-used-lens-for-dust-mold-and-scratches-5-tips-every-photographer-should-know\/","title":{"rendered":"How to Check a Used Lens for Dust, Mold, and Scratches: 5 Tips Every Photographer Should Know"},"content":{"rendered":"\n\n\n\n\n\n[et_pb_section fb_built=&#8221;1&#8243; theme_builder_area=&#8221;post_content&#8221; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221;][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]<p><span style=\"font-weight: 400\">Buying a used lens is a smart move\u2014it\u2019s a chance to get top-tier glass at a better value. But to make sure you\u2019re getting a lens that performs as expected, it\u2019s important to know what to look for before you buy.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Dust, mold, and scratches are the most common culprits when it comes to used lens issues. While some wear is normal, hidden damage can affect image quality, autofocus, or even the longevity of the lens itself. That\u2019s why we\u2019ve put together this straightforward guide to help you inspect, test, and care for your gear like a KEH Certified<span>\u2122<\/span>\u00a0pro.<\/span><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; width=&#8221;39.3%&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_image src=&#8221;https:\/\/keh.com\/cdn-cgi\/image\/q=80,fit=scale-down,format=auto\/expert-advice\/wp-content\/uploads\/2025\/07\/Close-Up-Marketing-Images-Test0892-scaled.jpg&#8221; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; title_text=&#8221;Close Up Marketing Images Test0892&#8243; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; align=&#8221;center&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]<h2><b>1. Know What to Look For<\/b><\/h2>\n<p><span style=\"font-weight: 400\">Even a lens that looks pristine at first glance can hide problems beneath the surface. Here\u2019s what to focus on during your inspection:<\/span><\/p>\n<p><b>What to Check:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Glass Clarity:<\/b><span style=\"font-weight: 400\"> Shine a light through the lens to check for haze or internal dust.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Mold:<\/b><span style=\"font-weight: 400\"> Look for thread-like or cloudy patterns inside the lens elements.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Scratches:<\/b><span style=\"font-weight: 400\"> Inspect both front and rear elements for visible scuffs or marks.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Lens Barrel:<\/b><span style=\"font-weight: 400\"> Watch for dents, cracks, or signs of impact.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Lens Mount:<\/b><span style=\"font-weight: 400\"> Make sure the mount is clean and undamaged.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">A little dust may not affect your images much, but mold spreads\u2014and once it\u2019s in the lens, it\u2019s hard to get rid of. Scratches, depending on depth and location, can cause flare or reduced contrast.<\/span><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_image src=&#8221;https:\/\/keh.com\/cdn-cgi\/image\/q=80,fit=scale-down,format=auto\/expert-advice\/wp-content\/uploads\/2025\/07\/2022-Fall-Catalogue-Canon-24-70-L-II-USM0296-scaled.jpg&#8221; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; title_text=&#8221;2022 Fall Catalogue Canon 24-70 L II USM0296&#8243; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; align=&#8221;center&#8221; width=&#8221;78.9%&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]<h2><b>2. Do a Full Physical Inspection<\/b><\/h2>\n<p><span style=\"font-weight: 400\">Grab a flashlight and take your time with this part. Use both your eyes and your hands\u2014look for visible issues and feel for irregularities in the lens body.<\/span><\/p>\n<p><b>Checklist:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Exterior:<\/b><span style=\"font-weight: 400\"> Check for wear, dents, or missing parts.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Focus and Zoom Rings:<\/b><span style=\"font-weight: 400\"> Rotate them to make sure they move smoothly.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Lens Mount:<\/b><span style=\"font-weight: 400\"> Look for corrosion or worn metal.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Then, inspect the glass more closely. Shine your light at different angles and rotate the lens. Fine scratches or mold can be easier to spot in reflection. If you\u2019re not sure, compare it to another lens you trust.<\/span><\/p>\n<h2><b>3. Use the Right Tools to Spot Internal Issues<\/b><\/h2>\n<p><span style=\"font-weight: 400\">Some flaws are hard to see without a little help. These simple tools can reveal more than the eye alone:<\/span><\/p>\n<p><b>Recommended Tools:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Flashlight:<\/b><span style=\"font-weight: 400\"> Essential for spotting internal dust or haze.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Magnifying Glass:<\/b><span style=\"font-weight: 400\"> Helps you confirm what you&#8217;re seeing.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><b>UV Light:<\/b><span style=\"font-weight: 400\"> Mold sometimes fluoresces under UV, making it easier to catch.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Look for web-like mold patterns, and keep an eye out for dust that moves around when you tilt the lens. Rotate the lens under light to pick up hidden scratches.<\/span><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; width=&#8221;44.4%&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_image src=&#8221;https:\/\/keh.com\/cdn-cgi\/image\/q=80,fit=scale-down,format=auto\/expert-advice\/wp-content\/uploads\/2025\/07\/2022-Fall-Catalogue-Canon-24-70-L-II-USM0290-scaled.jpg&#8221; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; title_text=&#8221;2022 Fall Catalogue Canon 24-70 L II USM0290&#8243; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; align=&#8221;center&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]<h2><b>4. Test the Lens Functionality<\/b><\/h2>\n<p><span style=\"font-weight: 400\">Mount the lens to your camera and take it for a test drive. See how it performs in real-world conditions:<\/span><\/p>\n<p><b>Functionality Checks:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Manual Focus:<\/b><span style=\"font-weight: 400\"> Should move smoothly from end to end.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Autofocus:<\/b><span style=\"font-weight: 400\"> Should be quick, accurate, and quiet.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Aperture Blades:<\/b><span style=\"font-weight: 400\"> Set the aperture to different values and check for responsiveness.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<li style=\"font-weight: 400\"><b>Image Stabilization:<\/b><span style=\"font-weight: 400\"> If the lens has it, compare handheld shots with IS on and off.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Take a few test shots at different apertures and focal lengths. Zoom lenses, in particular, should perform consistently across the range.<\/span><\/p>\n<h2><b>5. Clean and Protect After Purchase<\/b><\/h2>\n<p><span style=\"font-weight: 400\">Once you\u2019ve found a keeper, keeping it clean and stored properly will extend its life.<\/span><\/p>\n<p><b>Cleaning Tips:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Use a blower to remove loose dust before wiping.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Apply lens cleaning fluid to a microfiber cloth\u2014never directly on the glass.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Avoid harsh cloths or tissue paper that can scratch.<\/span><span style=\"font-weight: 400\"><\/span><\/li>\n<\/ul>\n<p><b>Storage Tips:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Keep lenses capped when not in use.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Store in a dry place\u2014add silica gel packs to control humidity.<\/span><span style=\"font-weight: 400\">\n<p><\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Regularly inspect for signs of mold or damage.<\/span><\/li>\n<\/ul>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; width=&#8221;49.1%&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_image src=&#8221;https:\/\/keh.com\/cdn-cgi\/image\/q=80,fit=scale-down,format=auto\/expert-advice\/wp-content\/uploads\/2025\/07\/Close-Up-Marketing-Images-Test0904-scaled.jpg&#8221; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; title_text=&#8221;Close Up Marketing Images Test0904&#8243; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; align=&#8221;center&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]<h2><b>Final Thoughts<\/b><\/h2>\n<p><span style=\"font-weight: 400\">Buying a used lens doesn\u2019t have to be risky. With a careful inspection and a little know-how, you can find high-performing gear that fits your needs\u2014and your budget.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Whether you\u2019re upgrading your kit or trying out a new focal length, KEH is here to help. Every KEH Certified<span>\u2122<\/span>\u00a0lens is inspected by our expert technicians and backed by a warranty, so you can focus on the shot, not the stress.<\/span><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Buying a used lens is a smart move\u2014it\u2019s a chance to get top-tier glass at a better value. But to make sure you\u2019re getting a lens that performs as expected, it\u2019s important to know what to look for before you buy. Dust, mold, and scratches are the most common culprits when it comes to used [&hellip;]<\/p>\n","protected":false},"author":90,"featured_media":55650,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","_oasis_is_in_workflow":0,"_oasis_original":0,"_oasis_task_priority":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1148,158,1145,1146],"tags":[],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.5.2.1 - aioseo.com -->\n\t\t<meta name=\"description\" content=\"Buying a used lens? 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