Canon EOS 50D
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HQ Grade: A
| A | is outstanding and exceptional, rated in the top 10% of digital cameras. |
| B | means they are good, with some standout features. |
| C | means they are mediocre, and probably more trouble than they are worth. |
| D & F | mean they are absolutely awful or old. Avoid at all costs. |
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This camera is ranked
- 1st of 51 in SLR/Professional
- 4th of 82 in Canon
- 1st of 4 in 15 Megapixels
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June 4, 2009 10:05 AM
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June 5, 2009 5:23 AM
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I suspect you may have focus accuracy issues with that lens. I had a 17-55 2.8 lens that needed to be sent to Canon Service for calibration, it was "set wrong in the factory" (actual words from service report). They replaced a chip component that was set to the wrong value.
The good news here is that your 50D has the micro-adjust setting that allows you to match the lens with your camera. If you determine focus is the issue read your 50D manual and try different micro-adjust settings until it looks centered, but be prepared for the possibility you may end up sending your lens and/or camera body into Canon for calibration if this feature cannot compensate enough.
The best way to test focus accuracy is with the camera mounted on a tripod, use only center focus point looking at a flat surface like a box that has markings with contrast the camera can focus on. On the left or right side of the frame have a tape measure on an angle so you can read the markings. Manually set the focus to minimum distance then take a test shot at f2.8, manually set focus to infinity then take another shot. Look through the viewfinder and manually set focus to the best of your ability then take another shot. Compare the 3 photos, are they all the same?
Here is a time when another handy feature of the 50D can be used to help you determine if the autofocus is accurate.
The LiveView function has a zoom feature which can help you tell if the focus is correct. After taking a normal shot turn on LiveView then set the zoom function to maximum (close up). Look at the display, remember don't let LiveView do any focusing, does it look good? If not, manually adjust the focus ring on the lens, does it come into focus now? If you can make it look better with manual adjustments then the auto focus is not working correct. Experiment with different micro-adjust settings to see if you can get it right.
If you find that focus is accurate but you still have problems:
- look at how you are saving photos on the flash card. Is is set to small jpeg?
- Is the lens clean?
- If you have a filter mounted on the lens, is it clean? Is it a cheapie? Cheap filters degrade photo quality!
- Do you need glasses? JUST JOKING! (I need glasses to clearly see anything within 18 inches)
Good luck and report back what you find.
-George
The good news here is that your 50D has the micro-adjust setting that allows you to match the lens with your camera. If you determine focus is the issue read your 50D manual and try different micro-adjust settings until it looks centered, but be prepared for the possibility you may end up sending your lens and/or camera body into Canon for calibration if this feature cannot compensate enough.
The best way to test focus accuracy is with the camera mounted on a tripod, use only center focus point looking at a flat surface like a box that has markings with contrast the camera can focus on. On the left or right side of the frame have a tape measure on an angle so you can read the markings. Manually set the focus to minimum distance then take a test shot at f2.8, manually set focus to infinity then take another shot. Look through the viewfinder and manually set focus to the best of your ability then take another shot. Compare the 3 photos, are they all the same?
Here is a time when another handy feature of the 50D can be used to help you determine if the autofocus is accurate.
The LiveView function has a zoom feature which can help you tell if the focus is correct. After taking a normal shot turn on LiveView then set the zoom function to maximum (close up). Look at the display, remember don't let LiveView do any focusing, does it look good? If not, manually adjust the focus ring on the lens, does it come into focus now? If you can make it look better with manual adjustments then the auto focus is not working correct. Experiment with different micro-adjust settings to see if you can get it right.
If you find that focus is accurate but you still have problems:
- look at how you are saving photos on the flash card. Is is set to small jpeg?
- Is the lens clean?
- If you have a filter mounted on the lens, is it clean? Is it a cheapie? Cheap filters degrade photo quality!
- Do you need glasses? JUST JOKING! (I need glasses to clearly see anything within 18 inches)
Good luck and report back what you find.
-George
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June 5, 2009 7:38 AM
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