For those unfamiliar with the numerous lens acronyms, HSM stands for Hyper Sonic Motor, (also known as Ultrasonic motor, Silent Wave Motor or even Sonic Direct-drive Motor) and is a faster, quieter and often more compact motor system for lenses. Essentially this should mean quieter and faster focusing.
What is a DG lens?
The DG designation indicates that the lens has been optimised for use with digital SLR cameras. The DG lenses feature improved (more even) light distribution from image centre to edge, especially at maximum aperture, compared to conventional fast wide-angle lenses.
What is Sigma DC lens?
Sigma DC lens:
DC lenses have an image circle that covers APS-C size image sensors, therefore they are not for use on digital cameras having image sensors larger than APS-C size or on 35 mm or APS film cameras, as vignetting will occur.
What does DN mean on Sigma lens?
DC DN in sigma lenses is meaning for “DC – lenses” designed for APS-C DLSR cameras. “DN – lenses” designed for compact system cameras. Basically “Sigma” is mainly known as a third-party “lens” manufacturer, producing “lenses” in mounts compatible with the major brands: Canon, Nikon, Pentax, Sony, Olympus.
What does APO DG in Sigma lens?
Sigma’s 70-300mm F4-5.6 APO DG Macro is a budget telephoto zoom lens that can be used on both APS-C and full frame cameras.Sigma makes several different 70-300mm lenses – here the APO designation means premium optics, and Macro means relatively close focusing, but this model doesn’t offer image stabilisation.
What is HSM Sigma?
Hyper Sonic Motor
The Hyper Sonic Motor (HSM) is an original SIGMA development that uses ultrasonic waves to drive the autofocus mechanism. Its extremely quiet operation helps avoid disturbing photographic subjects. High torque and speed assure rapid autofocus response.
What is Sigma DC and DG?
DC lenses are designed for cameras with an APS-C size sensor and won’t cover the entire image area of a 24x36mm (Full Frame) sensor. DG lenses are designed for cameras with a 24x36mm (Full Frame) sensor but will work equally as well on a camera with an APS-C sensor.
What is APS-C vs full-frame?
What is this? Sensor size is the physical dimensions of the sensor, not how many pixels are on the sensor. A full-frame sensor measures 36mm x 24mm – the traditional size for 35mm cameras. An APS-C sensor size is smaller, measuring 23.6mm x 15.7mm.
What is APS-C sensor?
APS C is an adopted term for the image sensor format approximately the size of the now-defunct Advanced Photo System film negative classic, of 25.1×16.7 mm, with an aspect ratio of 3:2. APS C sensors are cropped sensors that are generally cheaper and easier to travel with than their full frame counterparts.
What does Tamron SP mean?
Super Performance
Tamron first introduced its SP (Super Performance) series of lenses in 1979.The first introductions in the recently updated series are two pro-level prime lenses that are compatible with full-frame DSLR cameras. They feature image stabilization and a very wide maximum aperture.
What does EX DC HSM mean?
The Sigma 30mm f/1.4 EX DC HSM is a wide-aperture photographic lens made by the Sigma Corporation, equipped with Hyper Sonic Motor (abbreviated HSM, Sigma’s trade name for photo lens focusing technology using ultrasonic motor).
What does APO mean on a camera lens?
apochromatic lens
An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.
What does USM mean on Canon lenses?
It’s easy to take the technology behind autofocus for granted. Find out about the history of Canon’s Ultra Sonic Motor (USM) and STM technologies and how they deliver fast, smooth and quiet AF capabilities.
What is DI in Tamron lenses?
Di (Digitally Integrated Design) lenses are designed for full-frame and APS-C format digital SLR cameras and feature an optical design tailored to the characteristics of digital cameras.
What does contemporary lens mean?
Contemporary lens has a 1/3 stop wider aperture over a small subset of the focal length range. Contemporary lens has a larger zoom ring with no contour in diameter mid-ring. Sports lens has a more-serious manual focus ring that is significantly larger with much more grip surface.
What does Art mean in Sigma lenses?
With this lens, Sigma is inaugurating a new line of interchangeable lenses: the “Art” line. This new line of lenses is designed to emphasize creative expression above compactness and multi-functionality, and you can expect sharply defined, high-contrast images with nice background bokeh.
Do professional photographers use APS-C?
APS-C cameras used to be more for consumers who wanted to step up to something more substantial than a point and shoot. Now, APS-C cameras are excellent all-around performers that can be used by pros for many different genres of photography.
Is APS-C enough?
Yes and no. In terms of low-light capability, dynamic range, and image quality yes, but in terms of cost, weight, and sizes, APS-C takes the cake with its more compact camera body, less heavy glasses required in their lenses, and since there is less component, they are way cheaper than their full frame counterparts.
What does 1.5 crop factor mean?
This is why you might also hear crop factor referred to as the “focal length multiplier” (or “FLM”). For example, a 50mm lens on a 1.5 crop factor camera has an effective focal length of 75mm, because 50 x 1.5 = 75. If you fitted a 75mm lens to a 35mm camera, you’d get a photo with the same field of view.
What is the difference between CMOS and APS-C?
CMOS is a type of semiconductor, often used to make imaging sensors. APS-C is a standard size. They’re not directly related. CMOS would be compared to CCD, APS-C to ‘full frame’ and other sensor sizes.
How many pixels are in a megapixel?
million pixels
A megapixel (MP) is a million pixels; the term is used not only for the number of pixels in an image but also to express the number of image sensor elements of digital cameras or the number of display elements of digital displays.
Contents