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The National frames have a long top-bar to the frame (17 in or 430 mm) giving them long lugs of 1 + 1 ⁄ 2 in (38 mm) that rest on the runners. In its original form, the National hive provides 3 ⁄ 8 in (9.5 mm) bottom beespace—that is, the top surface of the frame bar is flush with the top of the box, and the lower surface of the frame is ...
Langstroth's patent of 5 October 1852 adopted 3 ⁄ 8 in (9.5 mm) as the upper limit of the bee space, slightly larger than optimal, between the side bars of a frame and hive wall, and also reserved rights to use the distance 1 ⁄ 2 in (13 mm) between top bars and inner cover, the latter of which represents a gap larger than optimal. The term ...
The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question; that is, = /. Given the same 3:2 aspect ratio as 35mm's 36 mm × 24 mm area, this is equivalent to the ratio of heights or ratio of widths; the ratio of sensor areas is the square of the crop factor.
Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...
The edges are cropped off, which is equivalent to zooming in on the center section of the imaging area. The ratio of the size of the full-frame 35 mm format to the size of the smaller format is known as the "crop factor" or "focal-length multiplier", and is typically in the range 1.3–2.0 for non-full-frame digital SLRs.
The Leaf Aptus-II 12's sensor size of 53.7 mm × 40.3 mm is 92% of the area of a 56 mm × 41.5 mm standard-sized 6 × 4.5 frame, 69% of a 56 mm × 56 mm square-sized 6 × 6 frame, and 45% of the area of a 56 mm × 84 mm 6 × 9 frame. Introduced in December 2010, the Pentax 645D is a 40 megapixel medium-format DSLR. The camera has a 44×33 mm ...
50mm F1.4, 17-40mm F4, 100mm F2.8 Macro, 24-70mm F2.8, 70-200mm F2.8. This article details lenses for single-lens reflex and digital single-lens reflex cameras (SLRs and DSLRs respectively). The emphasis is on modern lenses for 35 mm film SLRs and for "full-frame" DSLRs with sensor sizes less than or equal to 35 mm.
Canon full-frame cameras have used the EF lens mount since 1987. In comparison with that mount, the RF mount's inner diameter is the same at 54 mm. [1] The RF mount's flange focal distance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm.
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