The EF-S 17-85mm F4-5.6 IS USM is Canon sensible update from the primary 18-55mm kit lens offered its APS-C dSLRs. With a 35mm-equivalent central duration of 27-136mm, it includes a reasonable wideangle to telephoto variety, making it a useful ‘walkaround’ lens which will cover a number of photography possibilities. It also activities The canon eos 2nd-generation visual picture backing, which allows hand-holding at more slowly shutter rates of speed than regular before the image-degrading results of trembling digicam become obvious. This lens is clearly an effort by Canon to duplicate the success of their previously 28-135mm F3.5-5.6 IS USM, which obtained a healthy standing as an excellent entertainer on Negatives film.
- 27-136mm comparative central duration range; F4-5.6 highest possible aperture
- Optical picture stabilizing – 3 prevents
- Ring-type USM concentrating with full-time guide override
- EF-S install for Cannon APS-C dSLRS only
Canon EF-S 17-85mm IS USM Design
The 17-85mm is part of Canon close relatives of mid-range zooms, and as such the construction is a obvious phase up from the mild and portable nasty of the 18-55mm kit lens, if not quite up to the requirements of Canon professional-level ‘L’ sequence. The lens install is steel, and the gun barrel plastic; unfortunately it’s not quite as strong as The canon eos other mid-range zooms such as the 28-135mm F3.5-5.6 IS USM, and the nasty seems a bit slim and creaky, and deforms a little pressurized, which isn’t really comforting. However to its credit, and compared with the 18-55mm, the 17-85mm does have a appropriate guide concentrating band and range range. At 475g in weight, this lens is also completely mild enough to have with you all day long.
Canon EF-S 17-85mm IS USM Imagaes Quality
Best results are acquired in the regular to telephoto range, where the lens gives continually great sharpness numbers from Negatives to 85mm. Unfortunately things go from top to bottom towards extensive position, especially in the sides which are remarkably smooth at 17mm. The lens seems to be enhanced to carry out start up at all central measures, and reveals no methodical surge in quality on avoiding down to more compact apertures; at F11 and beyond the sharpness drops quickly due to diffraction, as predicted. We’d certainly recommend against using apertures more compact compared to F16, except in those unusual times when excessive detail of area is important.
Chromatic aberration is remarkably most severe at 17mm, where the almost-overlapping red and red collections indicate green-magenta fringing, which is creatively the most invasive (see also the example below). The tale is identical at 24mm, but at Negatives and beyond CA becomes much less of a problem.
We consider falloff to become obvious when the area lighting drops to more than 1 quit less than the center. Once again, the lens gives a inadequate displaying at 17mm, with 1.7 prevents of falloff extensive open; you’ll need to end down to around F8-11 to decrease it completely below obvious levels. However aside from that, there’s nothing too much to bother with, with just a sign of falloff start up at 24mm.
The 17-85mm also reveals uncommonly great gun barrel distortions at extensive perspectives, calculating a tremendous 2.4% at 17mm. This is also not ‘pure’ gun barrel distortions but a more complicated ‘wave’-type, with the gun barrel impact most noticeable towards the center, then squeezed in again towards the sides, which makes it relatively difficult to appropriate in software. At 24mm and longer the design changes to pincushion, and at its most severe gets to -1.5% at 50mm; again fairly noticeable, and easily noticeable if the picture should contain directly collections.
By far the most challenging part of this lens’s efficiency in real-life capturing is chromatic aberration at extensive position. Powerful green/magenta fringing is noticeable in 17mm photos even at moderate magnifications, and avoiding down the aperture has no impact. It continues to be an issue at 24mm, but is much less of an issue at more time central measures. This kind of chromatic aberration can be ‘corrected’ in application, and particularly successfully if you’re ready to capture RAW. For example, using our conventional ripper, Adobe Digicam RAW, handling with -30 Red/Cyan and +30 Blue/Yellow successfully removed CA.
Visual Picture Stabilization
The 17-85mm functions The canon eos second creation optical image stabilizing, which states to allow handholding at shutter rates of speed 3 prevents reduced than regular before cloud from trembling digicam becomes obvious. It’s near-silent in use, with just a silent whirring disturbance when functional, and with unique clicks of the mouse when it triggers and deactivates, presumably due to the lens components shifting in and out of the ‘at rest’ place.
We’ve usually found the models in SLR contacts to be fairly efficient at real-world use, and to evaluate this, we exposed the 17-85mm to our studio room image stabilizing analyze at both wideangle and telephoto. With its efficient central duration variety of 27-136mm, we’d normally anticipate to be able to get great results portable at 1/30 sec at wideangle, and 1/160 sec at telephoto without image stabilizing. The topic variety for these assessments was roughly 2.5m.
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Canon EF-S 17-85mm IS USM Specifications
|Street price||• US: $520
• UK: £360
|Date introduced||August 2004|
|Maximum format size||APS-C|
|35mm equivalent focal length (APS-C)||27-136mm|
|Diagonal Angle of view (APS-C)||78º – 18º|
|Lens Construction||• 17 elements/12 groups
• 1 Aspherical element
|Number of diaphragm blades||6|
|Maximum magnification||0.20x at 85mm|
|AF motor type||• Ring-type Ultrasonic Motor
• Full-time manual focus
|Image stabilization||• 3 stops
• Single mode (no panning)
|Filter thread||• 67mm
• Does not rotate on focus
|Supplied accessories||• Front and rear caps|
|Optional accessories||• EW-73B Hood
• LP1116 Case
|Weight||475 g (16.7 oz)|
|Dimensions||78.5 mm diameter x 92 mm length
(3.1 x 3.6 in)
|Lens Mount||Canon EF-S only|
|Other||Supplies distance information for E-TTL II flash metering|