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Re: Lens Test
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Lens Test
How should I go about testing a lens? I have a Sigma 120-400 F4/5.6 that is currently being used on a 7D(previous to that a 40D and an Xti before that) that I have struggled with from the beginning. Even the best shots seem soft. At this point I feel like I am trying way too hard and still not getting the sharpness I would… -
Re: Lens Test
OK, so I downloaded all the test pages you recomended. My autofocus would pick up even the lightest grey scale. I am very confident though that my single point was spot on the zero line. I did learn quickly that I needed the center line of the lens to be the same height as the zero line on the chart. I started out shooting… -
Re: Lens Test
So I contacted my Sigma dealer the 120-400 came from. He is 60 miles away so he got a call instead of another visit. His take was that it was not going to be a lens issue that it was going to be my 7D. So tonight I slapped the lenses on my 40D(remembered that it had live vieew) and it appears they matched up pretty good. I… -
Re: Lens Test
Sorry for the delay. I agree that the 70-200mm wall image tests at both 70mm and at 200mm both look soft, indicative of focus error. I suggest trying the micro-focus adjust with that lens with the brick wall again as the target. If the wall is in shade and with little contrast, you might use a flash at an oblique angle…
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