EF 28-135/3.5-5.6 IS
USM, EF-S 17-85mm f/4-5.6 IS USM lens coverage and a full frame camera is
almost the same. EF 28-135/3.5-5.6 IS USM retail price Lens Accessories of about 400 dollars, but
because the EF-S lens focal length much shorter, and the use of non-spherical
lens, so the price is higher than EF 28-135/3.5 -5.6 IS USM is understandable.
It looks like this is a very good lens, IS is also very useful when shooting
handheld low shutter speed. EF28-135 IS USM enthusiasts with a shot to use it Camera Batteries on my film and 10D (10D on
its scope and in the film machine on quite 45-216 mm lens).
For Nikon D70 lock with high quality zoom lens AF-S DX 18-70mm F3.5-4.5G Canon
followed suit, and then the upper floor, the operating performance beautifully
EF 28-135mm F3.5-5.6IS USM to "EF-S", the introduction of this is
designed for 17-85mm F4-5.6 Photography Equipment IS USM
20D/300D use.
The appearance operation: compared with the 28-135IS ,17-85IS designed for
APS-C digital SLR design, so the slightly smaller size (65 grams weight reduction,
filter diameter be reduced from 72mm to 67mm), but the texture of the lens
barrel assembly is Lighting Studio more solid, and the rubber zoom ring more fine lines the senior flu
improved a lot.
Closest focusing distance reduced by 28-135IS 50cm 35cm, but the actual focal
length of 1.6 times for the 17-85IS equal to 27-136mm, which is more favorable
macro photography. IS anti-shake mechanism into the third generation, Camera Flash security shutter speed can be
reduced to three, ,17-85IS breath to solve APS-C digital SLR wide-angle
photography, ultrasonic motor, anti-shake, close-up, and high magnification
zoom lens choice, operational performance give it five stars, regarded
mistreats it!
The realistic performance: the lens IS institutions it up to 12 groups of 17,
but which one aspherical lens elements contribute to the correction of various Tripods Headaberrations,
taking into account its lightweight design. A slight deformation of the
wide-angle end, vignetting control properly, describing the performance is not
bad.
Resolving power performance suggestions sight remote optimum performance,
wide-angle end the shrinking aperture to F8 to get sharper images overall score
of four stars.
High magnification zoom lens is very important occasions require mobility, and
anti-shake performance but also some of the harsh environment, such as not
using the tripod Caves or need a low-key place taken successfully captured
screen. Although theCamera accessories 17-85IS higher than the
price of 28-135IS than lowering the price function, but it is no substitute for
the status, as well as to take into account the level of more than the quality
of the overall the recommended degree final win four half star score of also
20D launched there plus Encore.
EF-S 17-85mm F/4-5.6 IS USM focus function (designed for EOS digital SLR
cameras and ultra-wide-angle zoom lens). 5x zoom, the focal length of
approximately 27-136mm (135 photos format). EF-S lens design can effectively
shrink the image circle and reduced focal length distance, so that the lens
body to become smaller and more compact. Use the Gmo ultra-high refraction
aspherical lens, the image is particularly sharp and clear. Flash Accessories Lenses optimized coating
greatly suppress ghosting and flare prone digital camera.
EF-S 17-85mm f/4-5.6 IS USM detailed specifications Camera
Equipment are as follows:
Viewing angle (diagonal) 78 ° 30 `- 18 ° 25`
Lens group 12 group 17
Number of diaphragm blades 6
Minimum aperture f/22 - 36
Closest focusing distance (m) 0.35m
Magnification 0.2
Lens motor drive inner focusing system camera
tripod (ultrasonic motor)
Filter Size (mm) 67mm
Mirror length (mm) (mm) 92 x 78.5mm x maximum diameter
Weight (g) 475g
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