Average Reviews:
(More customer reviews)Last year, after extensive research, I bought a Canon A540 to replace my trusty Olympus D40-Zoom. My goals for camera selection where (a) compact size, (b) standard AA batteries, (c) full manual controls, (d) outstanding image quality, (e) speed, (f) optical viewfinder. The A540 fit the bill almost perfectly, with a handful of limitations that I noted in my review.
This year, with Canon's release of the A570IS, I decided to upgrade, driven by the addition of optical image stabilization (IS). While the IS is impressive, I was surprised by other improvements that Canon has made. Image noise levels are significantly lower and more controlled for higher ISO captures. The Digic III processor seems to make more intelligent decisions about lighting and flash exposure, especially when its face recognition is engaged. Add a dramatically better quality LCD screen, slightly higher 7.1MP resolution, improved case, and support of high capacity SD cards, and I doubt I'll need to upgrade any time soon.
Like the A540, the A570IS is for me a perfect balance of size, speed, and photo quality. The A570IS is the same physical size as the A540. It's small enough to fit in a coat pocket or small belt case yet uses 2 AA batteries.
Like the A540, overall processing speed is very fast unless you're taking flash pictures (and then you should expect about 4-6 seconds between flashes depending on battery level and what flash strength the camera selected). Note that flash time is significantly better with high-capacity rechargeable NiMh batteries than with standard AAs. And, unlike some other cameras I have tried, the speed of the user interface (especially during playback) is very fast.
Picture quality in general is excellent, even in low light situations. Noise at higher ISO is significantly more controlled than the A540, perhaps a benefit of the new 7.1MP CCD and the Digic III image processor. According to the documentation, noise reduction is applied at slow shutter speeds of 1.3 seconds or greater, and this can slightly slow down shot-to-shot time. There is no option to disable or adjust the noise processing, but in my experience the results are very good. When noise reduction is applied, there is a slight loss of detail compared to the A540, but the results are noticeably better on the A570IS with its built-in noise reduction than post-processing noise on pictures taken with the A540.
In my own head-to-head comparisons between the A570IS and A540, the A570IS has better light metering and noticeably sharper detail on indoor shots without a flash (especially when image stabilization is engaged). The A570IS does favor slightly higher ISO in auto modes than the A540, giving generally better results without a flash. However, when taking close-up pictures with a flash, the A570IS doesn't seem to select anything lower then ISO 200, sometimes requiring a manual ISO override in Program mode.
The A570IS offers a new ISO 1600 mode, but I'm not quite sold on it. Without a tripod, under low light conditions, ISO 1600 does offer the opportunity for blur-free photographs not possible with ISO 800. But the level of noise and artifacts from the noise processing don't give a very usable picture.
The A570IS raises the bar with optical image stabilization, which only works when the camera is held horizontally. One of the biggest limitations of consumer digital cameras is the need to hold the camera steady to get a clear shot. At higher zooms and in night shots this problem can be compounded. I've taken a number of shots with and without IS, and it is useful but not a "magic bullet" for poor shots. Small details like far-away signs at night become clear when the IS is engaged. You can set the IS to run continuously during preview, only when the shutter is released (slightly lower battery drain), only on vertical movement (better for objects that are moving horizontally), or disabled (I have yet to find a reason to do so). And, unlike many cameras I've seen, the IS works in video capture mode.
Like the A540, the A570IS offers full manual controls. With the A570IS, Canon adds two more modes (Kids & Pets and Indoor) to the mode selector wheel (instead of having to find them on the Special Scene menu). The A570IS also adds a new Aquarium scene mode, while removing the useless Color Swap and Color Accent modes. Canon has also removed the "My Camera" customization menu (for changing the startup picture and various sounds) which I never used on my A540.
Although I never expected to use it, the movie mode is excellent. It's still not a replacement for a dedicated camcorder. But I have used it on a number of occasions to capture audio and video when a picture just won't do. Standard movie mode is 640x480 (VGA) quality at 30fps, but you can raise the capture to 60 fps at 320x240, or lower it to 15fps at 160x120. The A570 can now capture video up to 1 hour or 4GB whichever comes first. Video files are very large (around 1.9MB/second at 30fps) but they compress extremely well with QuickTime Pro's MPEG4 codec.
With the A570IS, Canon also addressed some of my minor complaints about the A540. Most notably, the LCD screen is much higher quality and higher resolution. The case plastics seem more solid, the small rubber door covering the USB - A/V - power ports pivots open from the side not the top, and the handle area no longer has a chrome insert which had a tendency to fall off. The ring that covers the conversion lens adapter mount has a chrome trim, making the camera more attractive but at least on my A570IS it is more difficult to remove than the A540.
Once again, I looked at the Canon A710IS which offers a 6x optical zoom, but has the same 7.1MP sensor, optical image stabilization and user interface with the older Digic II image processor. In the end, after trying both cameras in the store, I again settled on the A570IS. The A710IS is noticeably larger (about 0.25 inches wider and slightly taller), and the more complicated lens takes longer to startup and to zoom. Both cameras have a limited number of stops in their zoom range, but this is noticeable on the 6x of the A710IS where it is not noticeable in the 4x of the A570IS. For me, the larger size wasn't worth the extra zoom. And the benefits of Digic III are impressive.
In summary, Canon A570IS Pros:
- 7.1 megapixel sensor, 4x optical zoom
- ISO 80 to 1600
- optical image stabilization for higher ISO or zoom, even during video capture
- optical viewfinder for shooting with the LCD off
- full manual controls (shutter priority, appeture priority, full manual)
- preset and custom white balance control
- outstanding photo quality, even in relatively low light (good color balance, very low noise at higher ISOs, almost non-existent chromatic aberation)
- Digic III processor offers face detection, makes more intelligent decisions on exposure, and flash levels
- very good results from built-in noise reduction for slow shutter speeds of 1.3 seconds or greater
- very fast startup and shot-to-shot speed (flash not withstanding)
- excellent and speedy auto-focus even in low light (although the AF assist light can slow this down)
- orientation sensor recognizes if you have rotated the camera to take a shot
- flash adjusts angle based on wide-telephoto zoom
- built-in red eye reduction during playback lets you select an area to remove red eye and save as new or overwrite the existing image
- surprisingly usable movie mode
- outstanding user interface: options are well laid out and easy to locate, very well thought-out record and playback options
- extremely fast user interface and playback performance, even zooming in on photos
- high resolution LCD screen
- well built case, very comfortable grip
- uses SD cards and supports high-capacity SDHC (takes advantage of high-speed SD)
- uses 2 AA batteries (at least 2500 mAh NiMh rechargeable recommended)
- very good battery life (approx 400 shots on 2 rechargeable NiMh AA, with the display on)
- replaceable lithium battery protects settings when changing batteries
- supports optional high-power flash, conversion lenses and underwater case
Cons (to me, all very minor):
- flash recharge time is acceptable but not great (4 - 6 seconds between shots using NiMh batteries)
- preview display blanks while flash recharges
- Auto ISO for indoor flash close-up pictures doesn't seem to select below ISO 200; you can force ISO 100 in Program or manual modes
- ISO 1600 is of questionable real-world use because of noise and artifacts from noise reduction
- noise reduction cannot be adjusted or disabled
- it is possible to insert the SD card upside down and you don't realize until you try to close the cover (would be easy to break the cover if you force this)
- the markings for the battery orientation are difficult to read
- no RAW image support, but you can select from 3 different compression ratios for image quality
- bundled 16MB card is useless - buy a 2GB card
TIPS:
1) make sure you do a low-level format before you use your SD card in this camera, even if you had formatted it for another Canon camera. It makes a significant difference in shot-to-shot speed
2) always use high-capacity (2500 mAh or greater) NiMh rechargeable batteries - the flash recharge time is much improved (though still 4-6 seconds)
3) for indoor flash close-up shots, may need to override ISO to 100 for better quality
4) for outdoor shots in bright sun, setting exposure -2/3 gives better control of bright areas
5) if you use the conversion lens adapter, don't plan on using the built-in flash which is partially obscured by the adapter. I haven't tried it, but would expect the external flash to not have this problem.
Click Here to see more reviews about: Canon PowerShot A570IS 7.1MP Digital Camera with 4x Optical Image Stabilized Zoom
Canon PowerShot A570IS 7.1MP Digital Camera with 4x Optical Image Stabilized Zoom
No comments:
Post a Comment