- Clean the Lens
- Put the camera and lens on a tripod
- Remove the glass filter
- Attach the lens hood
- Turn the camera on
- Set the lens' autofocus drive for M/A, A, or AF
- Turn the lens' VR OFF
- Set for Single Point AF
- Set for AF-Continuous Servo AF (AF-C)
- Shoot at RAW Uncompressed (or Lossless compressed) and 14-bit (if available)
- Turn Active D-Lighting OFF (if available)
- Turn Long exp. NR OFF (if available)
- Turn High ISO NR OFF (if available)
- Set AF-C Priority Selection (in a Autofocus menu) for Focus (if available)
- Set Focus Tracking with Lock-On to OFF (if available)
- Set Self-Timer Delay (in c Timers / AE Lock menu) to 10s
- Set Exposure Delay Mode (in d Shooting/display menu) to ON (if available)
- Set for the LOWEST Base ISO sensitivity
- Manual mode
- Set the aperture for the highest aperture
- Adjust the shutter speed until meter reads "0"
- Place the aluminum soda can (e.g. Coke) dead in the center
Shooting:
- Use Remote Cable and Mirror Up (Mup) to shoot (add the sandbeg onto top of the camera on its axis, if available, before shooting)
- Repeat the steps for all apertures from maxumum aperture (lowest f/number) to minimum aperture (highest f/number), differing by one full stop (e.g. 1.4, 2.0, 2.8, 4.0, 5.6, 8.0, 11.0, 16.0, 22.0)
- If you wish to test a zoom (changeable focal length) lens, do full test for the widest focal length, medium focal length, and narrowest focal length (e.g. on the 24-70mm lens, test at all appertures at 24mm, 50mm and 70mm).
Inspection:
From the Lens Sharpness Chart, find the focal length(s) and aperture(s) your lens will be normally sharp.
Use one of the RAW development softwares (Photoshop, Lightroom, etc.)
- Import the images into LR,
- Click on Develop tab to start developing and scroll down to the Detail section
- Set the Amount for 75%
- Set the Detail for 50%
- Go to the last image on the filmstrip then press and hold Shift then click on the last image (selecting all images)
- Click on Sync then ensure all boxes are checked
- Click Synchronize
- Go back and click on the first image
- Click on the main preview for 100% magnification
- Inspect only in the dead center (the can) of the image
- Check the softness of all images (and compare the Lens Sharpness Chart)
Next Stpes:
- If the lens suffering some softness, run the tests again.
- If you lens continues to suffer from softness, proceed to AF Fine Tuning to calibrate the lens for improved sharpness performance.
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