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Old Nov 18, 2004, 1:49 AM   #1
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I am new to DSLR and just recently bought two new lenses. This was an upgrade from my "EF-S 18-55 Kit" lens. I've taken several photos from both lens -- some are sharp, others not so sharp. I started using a tripod to insure that the photos I'm taking will be sharp. It has helped. I'm just wondering what is the best way for me to test my lens in terms of meeting it's optimum performance? I've tried the "newspaper" test. Are there any other way? Your suggestions will be greatly appreciated.
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Old Nov 18, 2004, 5:49 AM   #2
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FYI

http://www.graphics.cornell.edu/~wes...res-chart.html
http://www.normankoren.com/Tutorials/MTF5.html#Distance
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Old Nov 18, 2004, 9:20 AM   #3
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How and where you do the test matters a lot.

don't do the test on the same floor of your home as your refridge. When the compressor turns on it will shake the floor. Same goes for a stand-alone freezer.

Do it with LOTS OF LIGHT. You want it to be easy for the camera to auto-focus (if you trust it) or enough for you to see the target clearly for manual.

Use mirror lockup and a timer or remote trigger.

Try it at different fstop values. Some lenses perform differently at different settings.

Eric
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Old Nov 19, 2004, 1:42 PM   #4
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Thank you very much for your responses. It's been very helpful and illuminating. I will do a thorough test this weekend. I hope my lens is sharp enough so I don't have to drive to Irvine Canon Service Center on MOnday.
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Old Nov 22, 2004, 9:10 AM   #5
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I generally go out and shoot a whole bunch. Then print out shots. If they look good...the lens tested OK.

I take all of the reports - charts- graphs and use them to start a fire in my fireplace.
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Old Nov 28, 2004, 12:10 AM   #6
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Thank you very much for all your suggestions, deeply appreciated:-)
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