lens calibration

[rpt]

Yeah, I read your advice in the past and at the time was having EV readings in the 8~10 range (which I thought was enough). With the same EV, testing on my other lenses, I had no problems. However, my macro 100L and my 50 1.4. would never even finish; it would just say that too many tests and still inconsistent. I will have another go sometime soon and try to get at least EV 12 and will see if that makes a difference.

thanks for the advice

in fact, I do have focal pro but I wasn't getting a consisten result.

Usually, there are two reasons for inconsistent results with FoCal - an unstable setup and/or not enough light. I started running tests on the main floor of my house, hardwood flooring, and even with a stable tripod me or my kids walking by perturbed the results. I moved the setup to the basement, concrete slab floor, no more problems. I use LOTS of light - 3 150 W-equivalent tungsten lights at a distance of 12-14" from the target. FoCal reports the EV reading for the test, mine are in the 11-12 range. If you're below 10 EV, that can cause problems.

If FoCal cant finish, either your camera is shaking or the light is flickering - or both. I had exactly the same issue. Turns out the tripod's raised center column and CFL bulbs were both to blame...

Changing to incandescent bulbs and lowering the central column sorted the issue out and Focal worked like a dream. Like neuro said, if the floor adds to shake, you need to sort that out too...

 

[rpt]

just calibrated my 5dm3 with focal plus as I noticed that my shots are being far from sharp.

had EV of 6-7

100-400mm W+6 T+13
24-105mm W+5 T+15

That is quite hardcore isn't it? Btw does +1 stand for 1mm or cm?

First off, I'd add light and try again. Your results may be ok, but IIRC FoCal recommends at least EV 8, and they used to recommend EV 10.

Each unit if AFMA represents 1/8 of the depth of focus for that lens at max aperture, so the absolute value actually depends on the lens. So, if you need +8 or -8, you're off by a full depth of focus. Note that depth of focus is related to depth of field, but is measured at the sensor, so the units are actually down in the micrometer range of physical distance.

Interesting! Well I was unhappy with the unsharp photos from my 5dm3 so as I said I calibrated it last night, but I went out today taking photos of wolves and again the photos don't come out sharp :/ it is very frustrating! I will try to calibrate again tomorrow with adding some daylight to it. What also wonders me is that for example I used my 100-400 on the t2i and got some amazing sharp shots whilst on my 5dm3 it is just not. I tried all kind of different AF settings...but I will calibrate again with more light and report back!

Please read my post above...