Ví dụ về việc sử dụng Zoom lenses trong Tiếng anh và bản dịch của chúng sang Tiếng việt
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The zoom lenses offered by both Canon and Nikon are vast.
So far Canon had abit of a problem regarding their EF-S standard zoom lenses.
Zoom lenses are simply lenses where you can change the focal length.
Compared to large aperture telephoto zoom lenses, the new A034 is lighter with a weight of just 30.3 oz.
Zoom lenses(such as a 24-70mm) will list the far ends of their focal length range.
It supports up to eight standard M4/3 lenses(including zoom lenses) with focal lengths ranging from 9mm-45mm.
The use of fluorite and UD lens elements hasbeen a standard technology on Canon's telephoto zoom lenses.
Zoom lenses are very convenient to use- all you need to do is turn the zoom ring to change the focal length.
On the other hand, most professional-level zoom lenses will have a single maximum aperture throughout the zoom range.
Even chromatic aberration is suppressed to a levellower than other conventional ultra-wide angle zoom lenses in the same class.
There are also no current zoom lenses except for the Tri-Elmar, which has three focal lengths for you to choose from and costs nearly $5K.
Surveys targeting top-tier professional photographersmade it clear that demand for ultra telephoto zoom lenses was growing.
Like all other zoom lenses in its class, the Sigma 17-50 OS extends when zoomed to its longest focal length.
Sharpness-wise, it is quite good,but definitely not in the same league as Nikon's excellent zoom lenses like Nikon 24-120mm VR.
These 3 zoom lenses are the most coveted zoom lenses in Nikon's lineup, largely because of their f/2.8 aperture;
Grab a Pentax lens off the shelf at B&H andyou will see that even the autofocus zoom lenses have a hard stop precisely at the∞ mark.
While the depictive power of recent zoom lenses is excellent, the amount of bokeh that can be created at a maximum aperture of about f/5.6 is incomparable to that by a prime lens. .
You also have the option of choosing from other lenses like macro,fast aperture or zoom lenses that let you specialize the look even further.
Released in 1990, this was the first Canon superzoom lens to use an inner-focusing system,which became a staple on zoom lenses.
This back focus adjustment is essential for zoom lenses as well and gives you better pictures while using the zooming of the camera.
Sudhakaran points out that one of the most famous directors in film history, Akira Kurosawa,is often believed to have used long zoom lenses as well, but actually worked mostly in the 35mm to 50mm range.
Other ultra-wide angle zoom lenses with similar focal ranges in Canon's current lineup include the EF16-35mm f/4L IS USM(released 2014) and the EF17-40mm f/4L USM(released 2004).
Prime lenses with moving front element that changes inlength as you focus are generally better than zoom lenses, but dust can still make it into the lens through the front.
The smallest and largest f-number you can set depends on your lens, but generally,prime lenses tend to allow you to set smaller f-numbers than zoom lenses do.
If it had not been for this mindset, Canon's large aperture L-series zoom lenses will probably not have had as much support from users or progressed to become what they are now.
He has handled the development and design of large diameter aspherical lenses, the key technology of the large aperture L-series zoom lenses, since he first started working at Canon.
One last quick tip regarding zoom lenses- you can calculate how many times a zoom lens zooms by dividing the longer focal length listed on the lens by the shorter focal length.
As you can see in the product shots above the lens extends quite a bit when zooming towards the long end of the zoom range butthis is typical for zoom lenses in this focal length class.
Simeon Quarrie noted that while photographic zoom lenses provide flexibility in focal length, it is not easy to get smooth transitions when zooming while recording as they are designed for zooming before taking an image.
A6400 users will have to rely on lens-based stabilization,and while a lot of Sony's APS-C-specific zoom lenses feature the company's Optical SteadyShot(OSS), many of its primes do not.