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This compact ruler allows you to determine if your lens is auto-focusing accurately as it should. It is an essential tool that is particularly useful when shooting with a shallow depth of field, where focusing should ideally be "spot on". You can use this ruler to determine how "off" the focusing is for a particular camera / lens combination and, on supported cameras, adjust the camera's auto-focus settings to resolve this.
On Nikon cameras, this feature is known as "AF Fine Tune". On Canon and Sony cameras, it's known as "AF Micro Adjustment". Please refer to your camera's instructions manual to see if this feature is present.
Size:28.1*18cm
Package Included:
Lens Focus Calibration Card X2
Usage
1. Set up the ruler.
2. Ensure both the camera and ruler are level, exactly perpendicular and at the same height. It is best to mount the camera on a tripod to do this.
3. Set the lens to the widest aperture to obtain the shallowest depth of field. This will make it easier to determine if your lens is focusing accurately. Auto-focus on the QR-Code at the center of the ruler, then take a photo.
4. Inspect the photo to see if focusing is accurate. It is recommended that you do this on a computer since you will be able to see better on a bigger screen. If focusing is accurate, the '0' on the ruler should be the sharpest point on the image and the other numbers get blurrier as you move away from the 0.
5. If any number above the 0 is clearer, then your lens is backfocusing. Otherwise, if any number below the 0 is clearer, then your lens is front focusing. In either case, you would have to set the auto-focus micro-adjustment parameters on your camera body until you are able to obtain a picture that is sharpest at the '0' on the ruler.
EldoradoBlackGold
Reviewed in Germany on January 30, 2025
Good, easy tool for back/front focus adjustment detection
Alexandre Pereira
Reviewed in Spain on July 25, 2024
Produto muito importante para quem quer ter lentes calibradas
mfdyer
Reviewed in the United States on June 14, 2024
Cared for carefully, these will last a long time. Great tool for the job.
Cliente Kindle
Reviewed in Italy on October 11, 2024
Economico e funzionale
Dkl01
Reviewed in the United Kingdom on February 16, 2023
The card arrives flat packed and just needs simply slotted together.The central image is held in place by a slot within.Works well, best used with a tripod.
Pier.
Reviewed in Canada on July 7, 2020
Bien fait , facile à monter, bonne qualité et l'impression très claire
Customer
Reviewed in the United States on February 13, 2020
Easy to use, and it got the job done. The only thing that would improve it would be a better defined focus point when testing your lens.
K. Wiedemann
Reviewed in the United States on May 3, 2019
Cost effective method for calibration of all your lenses. Simple to assemble and use.
Whitney Girton
Reviewed in the United States on December 18, 2019
Worked really well for calibrating all my Nikon and sigma lenses.
Blair
Reviewed in the United States on October 12, 2019
I am not an expert at calibration. Target seems too small for accurate calibration, but I was able to tell that my 100mm macro lens was very sharp, while my Tamron 24 - 70 was sharp at 70mm, but soft at 24 mm. I would not feel confident doing a calibration with that Target. Will look for a larger Target.
Eduard Kozhevnikov
Reviewed in the United States on April 28, 2019
Excellent
Nann
Reviewed in the United States on July 8, 2018
The quality of this item and the price are spot on. Ultimately however, the target is too small to accurately test lenses at the recommended distances of 10 to 25 times the focal length. I would prefer a larger target to fill the frame more and have to zoom less upon review of the image. Zooming that far in in the viewfinder, or in lightroom makes the print on the scale very difficult to read accurately. I returned the item and printed something larger from the internet.
Mark M.
Reviewed in the United States on December 19, 2018
Works well for my needs.
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