DSLR Camera images sensor and processor experience।।crop factor definition Photovision HD

DSLR Camera #images #sensor and processor experience।।#crop #factor definition Photovision DSLR Camera images sensor & prosesor experience DSLR Camera images sensor & prosesor experience।। DSLR Camera Crop Fector efore we dive in, let me dispel two vicious rumors related to crop factor that are circulating through the photography (Internet) world today: Crop factor does NOT affect a lens’s focal length. Crop factor does NOT affect a lens’s aperture. Before you scroll to the bottom of the screen to leave a comment to the contrary, let me explain why I am stating these facts… Focal Length The focal length of a lens, expressed in millimeters, is the distance along the lens’s optically central axis (beginning at the rear nodal point) to the image plane in the camera (often illustrated by a "Φ" on the top plate of a camera body) when the lens is focused at infinity. The image plane in the camera is where you will find your digital sensor or film plate. Therefore, a 50mm lens can measure 50mm from the point where light rays begin to exit the lens in the same direction as they entered the lens until they arrive on the image plane. Some “pancake” lenses and mirror lenses have optical tricks to shorten them, but in general, the focal length is that physical measurement. 35mm Format The first thing to know about crop factor is that, as with all “factors,” we need to have a base reference from which to work. In the photography world, this reference is a piece of 135 film. In the digital photography world, “full-frame” sensors are the same size as this film; a film frame with a width of 35mm. Cameras of this photography format are collectively known as “35mm cameras.” What Is a CCD Image Sensor? CCD (Charge Coupled Device) sensors convert pixel measurements sequentially using circuitry surrounding the sensor. CCDs use a single amplifier for all the pixels. CCDs are manufactured in foundries with specialized equipment. This is reflected in their often higher cost. There are some distinct advantages to a CCD sensor over a CMOS sensor: Less noise and typically higher-quality images, particularly in low-light conditions Better depth of color because the dynamic range of the sensor is often twice that of CMOS sensors Higher resolution and light sensitivity What Is a CMOS Image Sensor? CMOS (Complementary Metal Oxide Semiconductor) sensors convert pixel measurements simultaneously, using circuitry on the sensor itself. CMOS sensors use separate amplifiers for each pixel. CMOS sensors are commonly used in DSLRs because they are faster and cheaper than CCD sensors. Both Nikon and Canon use CMOS sensors in their high-end DSLR cameras. The CMOS sensor also has its advantages: Faster processing speed because the active pixels and ADC are on the same chip Lower power consumption, as much as 100 times less than a CCD Integrated camera functions like auto exposure, color encoding, and image compression directly in the chip Prevents "smearing" when an image is