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Forum: Troubleshooting and Beginner Help
06-26-2015, 10:14 AM
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Some good replies already. Viewfinder and Live view is almost useless with this lens, true. You can use live view with the digital zoom, this can be useful especially for close up subjects.
Anyway, what I do is simple. I just learned approximately where infinity focus is around f8. Now I know where to place the focus ring when I shoot at f8 to get almost everything and infinity into acceptable focus. You can try using higher apertures as well, up to around f14, for extra DoF to mask focusing errors.
But if you are focusing on nearby things, within 1m, then you should be able to find focus well enough.
Secondly, make sure your lens is not decentered. Take a photo of a newspaper at 45 degree angle to the sensor place, places somewhere near to the lens (35cm from camera?) and shoot at f2.8, then f4, then f8. Now you should be able to see the DoF and whether the photo is decently sharp across the sides. If one half of the frame is oddly blurred or if the DoF is sharply diagonal, then the lens might be decentered and should be replaced/repaired.
Oh, one more thing. Using a tripod with 2sec timer will improve sharpness even more. This lens can produce super sharp images, but it is fickle and takes some getting used to. We even have a couple threads about this. Good luck.
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