File:Yellowing of thorium lenses.jpg
Original file (4,734 × 1,702 pixels, file size: 4.32 MB, MIME type: image/jpeg)
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Summary
DescriptionYellowing of thorium lenses.jpg |
English: Some older photographic lenses were produced with glass elements containing small amounts of thorium. If stored in the dark for prolonged periods of time, these lenses can undergo what is commonly called “yellowing”. While some photographers enjoy the effect the yellowed glass has on their photographs (it acts similar to a weak yellow filter), others prefer to reverse it by exposing the lens to a UV light source.
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Date | |
Source | Own work |
Author | El Grafo |
Licensing
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- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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Assessment
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This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope: Yellowing of Takumar lenses. You can see its nomination here. |
Items portrayed in this file
depicts
4 January 2015
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:39, 22 February 2015 | 4,734 × 1,702 (4.32 MB) | wikimediacommons>El Grafo | minor background fix |
File usage
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Metadata
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If the file has been modified from its original state, some details may not fully reflect the modified file.
Camera manufacturer | PENTAX |
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Camera model | PENTAX K-5 |
Author | El Grafo |
Copyright holder | El Grafo (CC-BY-SA 4.0) |
Exposure time | 1/125 sec (0.008) |
F Number | f/8 |
ISO speed rating | 100 |
Date and time of data generation | 13:53, 4 January 2015 |
Lens focal length | 100 mm |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | GIMP 2.8.10 |
File change date and time | 14:07, 22 February 2015 |
Exposure Programme | Manual |
Exif version | 2.2 |
Date and time of digitising | 13:53, 4 January 2015 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Colour space | Uncalibrated |
Sensing method | One-chip colour area sensor |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 150 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Close view |
GPS tag version | 0.0.3.2 |