Microfocus Adjustment Micro Focus Adjustment Background What is
Micro-focus Adjustment
Micro Focus Adjustment
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
Can all cameras correct it? �Only cameras that support AF fine tuning or Lens Micro -adjustment can correct this issue �NIKON: D 4, D 3 X, D 3 S, D 3, D 810, D 800, D 750, D 610, D 600 �CANON: 1 DX, 1 DE, 1 D 4 1 Ds. Mk 3, 5 D 2, 5 D 3, 50 D, 7 D �PENTAX: K 20 �SONY: A 900
What does it look like (Target) Front focus Back focus
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
Targets �Target adjustment systems are available from several sources �Lens Align Mk II by Lens Align
Targets (cont. ) �Spyder Lens Cal System by Data. Color
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
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
Software (Fo. Cal) �Fo. Cal 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
Software (Fo. Cal cont) Screen shot from Fo. Cal AFMA Test
Software (Focus. Tune) �Focus. Tune (http: //michaeltapesdesign. com/focustune. html) �Works with Lens. Align 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
Software (Focus. Tune cont) Focus. Tune target image
The Nifty Image �This MOIRE Pattern Image can do the job
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.
The Nifty Image (cont) �You can find a great article regarding focus calibration and a link to the Nifty Image at: http: //www. northlightimages. co. uk/article_pages/cameras/1 ds 3_af_micoadjust ment. html
Points to Remember �Set Vibration Reduction OFF �Use JPEG or Tether the Camera �Set the lens to it’s widest aperture (i. e. f 1. 8) �Set the distance from the camera to target at 50 times the focal length of the lens (50 mm = 8. 2 ft) � Distance calculation tool: http: //michaeltapesdesign. com/lensalign. html �Single point focus control, not continous
Manufacturer Calibration �Of course, you can always send it in �Many camera stores are able to offer this service �Manufactures offer this service
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
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