![]() ![]() High Dynamic Range (HDR) photography is a technique to express the high tonal range of a scene as perceived by the human on an LCD display with limited tonal range. F-stop is expressed as the ratio of the lens's focal length to aperture. ![]() A low F-stop, such as f/1.8 indicates a wide aperture (more light), while a high f-stop, such as f/16, indicates a narrow aperture (less light). FPĪlso called F number, is the measure of the aperture of a lens. The extent of the scene that can be observed using the human eye or a camera lens. Focus RackingĪs with Zoom Racking, you can sometimes achieve interesting effects by changing the focus during a long exposure. Higher the focal length, greater the magnification. The magnifying power of a lens depends on its focal length. The distance in millimeters between the optical center of a lens and its focal point. Most digital cameras use smaller (APS-C) sized sensors with crop factors varying from 1.5 to 1.6. High end professional DSLRs use FF sensors. A full frame (36x24mm) image sensor roughly corresponds to the single exposure frame size of a 35-mm film. The human eye is estimated to have a dynamic range equivalent to 20 f-stops digital SLRs have a dynamic range of 8-11 f-stops (newer cameras do increasingly better in this area), and an LCD monitor, 7-9 f-stops. An f-stop of 1 corresponds to a factor of 2, an f-stop of 2, to a factor of 4, of 3, to a factor of 8, and so on. An increase in f-stop by 1 represents a doubling of the factor. The measure is commonly expressed as f-stop. It is measured using base-2 logarithmic values, as the power or factor of 2. In the context of photography, Dynamic Range is the ratio between the largest and smallest measure of light. The zone of reasonably sharp focus in terms of distance from the camera DOF depends on focal length and aperture. This is seen as advantageous for telephoto photography. In other words, to get the same field of view on a cropped sensor, a shorter focal length is required. For example, a 50mm lens on a Pentax APS-C camera would deliver the same field of view as a 75mm lens on full-frame. Canon DSLRs have a 1.6x crop factor.Ĭrop factor narrows the FOV, as would a higher focal length (telephoto) lens the Equivalent Focal Length (EFL) of a full frame lens fitted on a crop DSLR is computed by multiplying the focal length by the crop factor. Crop factor for Pentax and most other DSLRs is 1.5x. ![]() The projected image is larger than the sensor and so gets cropped!Ĭrop factor is the ratio between the diagonal of a FF sensor and the diagonal of a smaller sensor. Crop FactorĭSLRs featuring sensors smaller than a FF sensor, don't "see" the full frame when fitted with a 35mm camera lens. This results in color fringes along boundaries that separate dark and bright parts of the image. As a result, a lens is unable to focus all colors at the same convergence point. CAĬhromatic Aberration is color distortion that occurs because a lens refracts different wavelengths (colors) of light at slightly different angles. Bokeh depends on the quality of a lens but can to some extent be controlled by varying the DOF with aperture (f-stop) setting. Specifically, how the highlights show up - with hexagonal or circular shapes- depending on the shape of the lens's aperture blades. BIFīokeh is Japanese for blur, but in photography it refers to the subjective aesthetic quality of the blur. The opening of a lens, which determines the amount of light that reaches the sensor. We have grouped our cheat sheet under two headings Weird diaphragm issue on Tamron 90mm Macro.Architecture 200 year-old ancestral home, Neuville, QUEBEC.Project 52 Project 52-11-4 - COLOR- B/W.Weekly Challenge Caption Contest: Oct 3rd - Oct 10th 2022.Weekly Challenge Weekly Challenge #592 - Dogs.Project 52 PROJECT 52-11-5 ARCHITECTURE- Architecure in landscape.HD Pentax-D FA 21mm F2.4 ED Limited DC WR.Mindshift Gear Rotation180 34L Backpack Review.August "Dramatic Sky" Contest Finalists Announced. ![]()
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