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Product Weight: 0.75kg Bayonet: Canon bayonet Breed: SLR lens Type: Standard Zoom Brands: Tamron Origin of goods: Chinese or Japanese (batches of different origin may be different)Product Show:SP AF28-75mm F/2.8 XR Di LD Aspherical [IF] MACRO Model A09● large aperture charm
Large aperture lens has been one of the charms.
Refers to the diameter of the aperture ratio.
That is [the amount of light the size of the channel].
Large aperture lens (Example: F/2.8) of the amount of light can reach normal lens (Example: F / 4) 2 times.
(The above example, the aperture value and shutter speed will be [a] difference).
Therefore, the large-diameter lens has the following advantages:
[High speed shutter? Thus avoiding tremor and get clear photos]
[Extrafocal generate a lot blur? Main highlights, such as the background is a large number of virtual viewfinder in the composition on the edge].
Typically lens aperture closes to a certain extent (F/11 or so), the picture quality will be improved.
Even closing the aperture to F / 8 ordinary photography, due to the large aperture lens from the open to the closed state a greater degree, so performance is better than ordinary iris lens.● In the entire range of focal lengths have a large F/2.8 aperture, while compact and lightweight.
Aperture ratio (i.e., the lens aperture value) refers to the effective focal length of the lens aperture (light to pass through, the actual aperture size) ratio.
※ 1. At the short focal length wide-angle end design of large aperture zoom is relatively easy (just effective aperture narrow).However, if you want to have access to the same caliber at the telephoto end than words, you need a large caliber, so the lens had to increase the volume.
However, if the focal length is changed, the maximum F value does not change, it will be more conducive to shooting (to obtain the same shutter speed).
Calculated the effective focal length of the lens aperture ratio
In addition, the use of telephoto blur the background, while a high-speed shutter to prevent jitter, when these effects are at the telephoto charismatic.※ 2, to achieve a "telephoto end at all focal lengths range can reach F/2.8" lens in order to be called a true [large diameter lens].
Can form large-scale large-caliber generally designed to be compact and lightweight, which relies on the Tamron proud of technological capabilities.
For example 28mm, to prevent jitter, the shutter speed can not be less than 1/30 second.The 75mm can not be less than 1/80 seconds, more than 28mm require a faster shutter speed.● XR, LD, ASL (aspherical) lens and special glass.
· XR glass<BR> a high refractive index and characteristics of shortening the length of the optical system, can greatly reduce the lens size.
· LD glass<BR> can effectively improve the telephoto end, Macro, due to chromatic aberration caused by the picture sharpness is low, get high quality picture.
· ASL (aspherical = aspherical) lens<BR> can improve the spherical aberration and the distortion to obtain high image quality, reduction of the number of lenses to achieve the miniaturization of the light.
· Achieve the world's smallest? Lightest<BR> Tamron zoom lens by developing a large (28-200mm ,28-300mm), the lens can be realized and achieved miniaturization revolutionary technology "XR".As a result, achieved a similar lens has never been miniaturized.You also have had [was quite want to buy a large aperture lens, but that is too heavy, holding a convenient ...] ideas?If you have had such thoughts, it must use a large aperture standard zoom lens Tamron.Appearance and general standard zoom lens (F/3.5-4.5) as small as well as large-aperture lens only has a shot advantage, let your photos get real change.
· "Di" designed specifically for digital SLR cameras.
Di (Digitally Integrated Design) said that according to the characteristics of digital SLR cameras for imaging optical design of the lens.
· In the entire zoom range, recently taken away remain 33cm.
Achieved recently perturbation from 33cm, the shortest of the lens at the same level.75mm focal length when reached 1:3.9 macro magnification.
* Use the zoom locking device and petal-shaped lens hood standard accessories.
To prevent carry its own weight caused by the lens barrel fall, using a zoom lock devices.When shooting outside the screen composition intense light can cause ghosting and flare Tamron end with petal-shaped lens hood to block glare quadrangle outside the frame.
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If the order has already been shipped; you may return the item to us postmarked within 30 calendar days of delivery. Before that, please contact our Live Support to inform that.
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For customization, please consider carefully before ordering.Because we do not accept return and replacement.
|Unit Price||USD$ 793.83||USD$ 691.34||USD$ 612.29||USD$ 549.47||USD$ 498.33|
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• If the order has not been shipped; please contact DinoDirect Live Support for order cancellation.You will get your refund within 24 hours.
• If the order has already been shipped; you may return the item to us postmarked within 30 calendar days of delivery. Please contact our Live Support to inform that.
• Please contact Live Chat or click here to learn more return policy.