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2. Circle of confusion - Wikipedia

   en.wikipedia.org/wiki/Circle_of_confusion

   At the ordinary distance of vision, of from twelve to fifteen inches, circles of confusion are seen as points, if the angle subtended by them does not exceed one minute of arc, or roughly, if they do not exceed the 1/100 of an inch in diameter. Numerically, 1/100 inch at 12–15 inches is closer to two minutes of arc.

3. Album cover - Wikipedia

   en.wikipedia.org/wiki/Album_cover

   An album cover (also referred to as album art) is the front packaging art of a commercially released studio album or other audio recordings. The term can refer to: the printed paperboard covers typically used to package: sets of 10 in (25 cm) and 12 in (30 cm) 78 rpm records. singles and sets of 12 in (30 cm) long-play records.

4. Floppy disk - Wikipedia

   en.wikipedia.org/wiki/Floppy_disk

   8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale) 3½-inch, high-density floppy diskettes with adhesive labels affixed The first commercial floppy disks, developed in the late 1960s, were 8 inches (203.2 mm) in diameter; [4] [5] they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold ...

5. Image circle - Wikipedia

   en.wikipedia.org/wiki/Image_circle

   The image circle is the cross section of the cone of light transmitted by a lens or series of lenses onto the image plane. When this light strikes a perpendicular target such as photographic film or a digital camera sensor, it forms a circle of light – the image circle. Various sensor aspect ratios may be used which all fit inside the same ...

6. Image sensor format - Wikipedia

   en.wikipedia.org/wiki/Image_sensor_format

   In digital photography, the image sensor format is the shape and size of the image sensor . The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras ...

7. File:CIRCLE 1.svg - Wikipedia

   en.wikipedia.org/wiki/File:CIRCLE_1.svg

   Original file ‎ (SVG file, nominally 612 × 618 pixels, file size: 23 KB) Commons is a freely licensed media file repository. . Description CIRCLE 1.svg. Diagram of a circle . This is a w:vector graphics version of w:Image:Circle-1.png which was licensed under the GFDL. Date.

8. Astrophotography - Wikipedia

   en.wikipedia.org/wiki/Astrophotography

   An image of Orion's Belt composited from digitized black-and-white photographic plates recorded through red and blue astronomical filters, with a computer synthesized green channel. The plates were taken using the Samuel Oschin Telescope between 1987 and 1991. Astrophotography, also known as astronomical imaging, is the photography or imaging ...

9. Compass (drawing tool) - Wikipedia

   en.wikipedia.org/wiki/Compass_(drawing_tool)

   A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, it can also be used as a tool to mark out distances, in particular, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes. Prior to computerization, compasses ...