1. Micro-focus Adjustment

2. Micro Focus Adjustment

3. Background
What is it?
Most commonly known as FRONT FOCUS or BACK FOCUS
Occurs when the image reaches focus outside the focal plane of the camera

4. Can all cameras correct it?
Only cameras that support AF fine tuning or Lens Micro-adjustment can correct this issue
NIKON: D4, D3X, D3S, D3, D810, D800, D700, D750, D610, D600
CANON: 1DX, 1DE, 1D4 1DsMk3, 5D2, 5D3, 50D, 7D
PENTAX: K20
SONY: A900

5. What does it look like (Target)
Front focus
Back focus

6. What can be done about it?
Manufacturer service and adjustment
DIY Use a target and adjust it yourself Software solutions are available A nifty IMAGE displayed on a monitor A combination of all the above

7. Targets Target adjustment systems are available from several sources
Lens Align Mk II by Lens Align

8. Targets (cont.)
Spyder Lens Cal System by DataColor

9. Targets (cont.)
DIY Targets Set a high contrast target on a flat surface with a ruler set at a 45 degree angle through the target

10. Software
Software is available to take advantage of LIVE VIEW from your camera, a standard target, and tethering your computer to your camera.
Advantages:
You get immediate feedback through your computer
Reporting and analysis tools are often included
Some camera systems support fully automated adjustment

11. Software (FoCal) FoCal by Rieken (http://www.reikan.co.uk/focalweb/ )
Available in both Mac (OSX) & Windows versions
Supports multiple cameras under a single license
Performs multiple function test in addition to focus adjustment
Spot analysis, multipoint focus test, aperture sharpness tests, AF consistency, and others
All tests supported by full reporting

12. Software (FoCal cont)
Screen shot from FoCal AFMA Test

13. Software (FocusTune)
FocusTune (
Works with LensAlign targets or stand alone
Available in Mac (OSX) & Windows versions
Supports multiple cameras
Performs multiple function test in addition to focus adjustment
Spot analysis, multipoint focus test, aperture sharpness tests, AF consistency, and others

14. Software (FocusTune cont)
FocusTune target image

15. The Nifty Image
This MOIRE Pattern Image can do the job

16. The Nifty Image (cont.)
To use the Nifty Image, you display the image on a computer screen while focusing your camera on the image. A properly focused system will display small patterns within the image.

17. The Nifty Image (cont)
You can find a great article regarding focus calibration and a link to the Nifty Image at:
images.co.uk/article_pages/cameras/1ds3_af_micoadj ustment.html

18. Points to Remember Set Vibration Reduction OFF
Use JPEG or Tether the Camera
Set the lens to it’s widest aperture (i.e. f1.8)
Set the distance from the camera to target at 50 times the focal length of the lens (50mm = 8.2ft)
Distance calculation tool:
Single point focus control, not continous

19. Manufacturer Calibration
Of course, you can always send it in
Many camera stores are able to offer this service
Manufactures offer this service

20. Wrapping it Up Use the NIFTY Image to see if you have an issue
Check your lenses at least once a year
Check your manual for additional information
Always use a tripod