Taking Test Shots

1 - Some things to watch out for.

After having removed as much disturbing factors as possible and having properly installed camera and target you are ready for a test shot session.

Some things to watch out for:

  • fix the camera well on the tripod, so that it can't move during defocusing, or during a change of the autofocus adjustment
  • don't forget to put vibration reduction / image stabilize to off
  • be careful not to touch the multi-selector, as you may change focus point (lock the multi-selector preferably)
  • take care not to touch the zoom ring during one session
  • take care not to move the tripod, while this obvious, it is easy to give it a kick without knowing
  • don't exaggerate, take just enough test shots (4 per Autofocus Adjustment  (AFA) is enough)
  • one session at a time
  • Monochrome, highest quality JPEG, Single Shot, Single Focus point

2 - Test shot sequence for a flat target

After having taken some Live View pictures for control purposes, here is a scenario for a general scope AFA Analysis using a flat target:

Set AFA -20

  1. defocus
  2. focus (shutter or AF-ON)
  3. shoot

repeat 3 times (4 pictures in total)

Change AFA to -15

1.defocus

2.focus (shutter or AF-ON)

3.shoot

repeat 3 times (4 pictures in total)

and so on until you get to +20

3 - Test shot sequence with LensAlign

Set AFA 0

Take a test shot

Check on the camera LCD whether the lens shows back or front focus.

If you see back focus, shoot a series from AFA -20 to 0 in five step increments.

If you see front focus, shoot a series from AFA +20 to 0 in five step increments.

Set AFA to -20 or +20

  1. defocus
  2. focus (shutter or AF-ON)
  3. shoot

repeat 3 times (4 pictures in total)

change to next AFA and repeat above cycle until (and including) AFA 0

 

 

 

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