How does a small scratch on the front lens element affect image quality?
Asked 2/19/2011
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I have a Panasonic 14-45mm Micro Four Thirds lens with a small but noticeable scratch near the center of the front element. In normal photos I can't see any obvious difference. When do scratches like this actually show up in images, and is it important to have the front glass replaced?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
15y ago
2 Answers
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Most of the time, the scratch will show up as a small and perhaps even unnoticeable amount of softening in the image. (It will largely be "outvoted" by the vast majority of the light, which is being focused properly.) In high contrast situations, though, or when the light is striking the lens directly, there may be a significant mount of flare washing out the image and reducing overall contrast.
The scratch will probably also make the lens element more fragile, so it will likely to be easier to crack that lens element if the lens is dropped or given a good bump -- that depends on the type of glass.
Fixing it isn't a critical emergency unless it interferes with the kinds of pictures you want to take, but if you plan to keep the lens for a long time, it would be a good idea to get it repaired at some point.
Originally by user2719. Source · Licensed CC BY-SA 4.0
user2719
15y ago
0
Generated from our catalog & community — verify before relying on it.
A small scratch on the front element usually has much less effect on image quality than it looks like it should. In many cases, you won’t notice it at all in normal photos because most of the light is still passing through the rest of the lens correctly.
Where it may show up is in difficult lighting: strong backlight, direct light hitting the lens, or other high-contrast scenes. In those situations, the scratch can increase flare and reduce overall contrast, and may cause slight softening.
So if you’re not seeing problems in your images, it’s generally not an urgent repair. The main downsides are:
- more flare risk in certain conditions
- possible reduced durability of that element
- lower resale value
Replacement is usually only worth considering if the scratch is affecting the kinds of photos you shoot or if you plan to keep the lens long-term and want it restored.
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