Canon's series of L lenses (Luxury lenses) are a professional line of photography lenses made by Canon.
If you notice your Canon digital SLR camera lens has the letters USM written on the side, it means the lens has a small motor built into the body. Hence, USM is short for Ultra Sonic Motor.
A L-series fisheye zoom lens offering a choice of full frame or circular image and a wide angle of view.
What you get with an L is solid build, higher quality control, excellent optical design, better coatings, great ergonomics, and weather sealing. There are a number of non-L lenses that are up-to-snuff in their own right. For instance I've been agonizing between the 70-300 IS and the 70-200 f/4L IS.
So why does Canon make its telephoto lenses white? The reason is because of "heat." When photographers are outside, under the blazing sun, even a slight warping of the lens components due to heat can have a negative effect on the resulting photo.
EF-S stands for Electro-focus short back focus. This Canon lens mount was launched alongside the EOS 300D (EOS digital Rebel) camera in 2003. EF-S lenses have an image circle which just covers the sensor of APS-C cameras, meaning that the image circle is smaller in size than in EF lenses.
The L-Mount Alliance is a partnership between Leica Camera, SIGMA, Panasonic and, more recently, Leitz Cine Lenses. Its aim is to provide photographers with one unified lens mount standard. Developed by Leica Camera, the L-Mount allows photographers to combine lenses and cameras made by the four Alliance partners.
A compound microscope is an instrument which consists of two lenses L1 and L2. The lens L1 called objective, forms a real, inverted and magnified image of the given object. This serves as the object for the second lens L2; the eye piece The eye piece function like a simple microscope or magnifier.
The RF version is also slightly sharper wide open, but not significantly, and still less sharp than the slightly slower EF Sigma 50mm f/1.4. In short, the differences are there if you're looking for them, but they're not as immediately noticeable as the differences between the RF and EF versions of the 24-70 or 70-200.
Canon's high-end lenses carry a red ring around the lens barrel, and the famous L Series branding. These lenses are designed for professional usage and are built to the highest standards, with extreme sharpness and durability in mind.
Low-dispersion glasses are particularly used to reduce chromatic aberration, most often used in achromatic doublets. The positive element is made of a low-dispersion glass, the negative element from a high-dispersion glass. To counteract the effect of the negative lens, the positive lens has to be thicker.
The 24-105 can be used for portrait and landscape of course, but on a crop camera it would not be my first choice for either application. Its not very wide for landscapes and the max aperture is too small for portraits.
Other lenses that will fit Canon EOS cameras are TS-E and MP-E lenses, which are specialty manual-focus lenses. For Canon's APS-C DSLR line, EF-S (EF with short backfocus) lenses can also be used except on the very oldest models. USM is an autofocus motor technology.
An STM lens uses one type of autofocus system, while a USM lens uses another type of autofocus system. These designations have nothing to do with optics, and the image quality of an STM lens vs a USM lens will be completely unaffected.
USM works on the autofocus mechanism of the lens while the IS compensates for the motion of the camera by moving the lens element inside. USM, which stands for Ultrasonic Motor, is an alternative way of moving the lens element inside in order to bring the subject into focus.
Solution. (1) The lens with the smallest power or largest focal length should be used as the objective i.e lens with power 0.5 D. The lens with the largest power or smallest focal length should be used as the eye-piece i.e. lens with power 10 D.
The power of a lens is less means that reciprocal focal length . So lens `L_2` is to be used as objective (focal length and aperture largest )and `L_3` as eyepiece (focal length and aperture smallest).
Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness. The formula is as follows: 1 v − 1 u = 1 f.
Due to its diameter of 51.6 millimetres, the L-Mount is suitable for cameras with a full-frame sensor as well as cameras with an APS-C sensor. Equally, L-Mount lenses are compatible with both types of camera, which significantly expands their scope of applications.
The mount is used by the Leica TL (discontinued), TL2, Leica CL (2017) and Leica SL systems. The L-Mount is a registered trademark of Leica Camera AG.
The L-Mount mirrorless system is a bit different—while it was started by Leica alone, it's been joined by Panasonic and Sigma. Together, the three make up the L-Mount Alliance.
Put simply, Canon EF-S lenses are designed solely for use on Canon APS-C DSLRs. Canon EF lenses are designed to work with full frame and APS-C DSLRs from Canon. Canon EF-S lenses have a smaller image circle that is only big enough to cover the smaller sensor found on Canon APS-C cameras.
In short, EF refers to the mount type for Canon lenses, while EOS is a name given by Canon to the series of bodies that used the Electro-Optical System.
Negative. The EF-S mount on a lens is designed in such a way to be incompatible with an EF mount camera body. Besides, even if you could mount the lens, the image circle projected by the lens would not fully cover a full frame image sensor.