Specification Brand : Deeoee BulletPoint : Camera Lens Focus Calibration Card AF Micro Alignment Ruler Folding Chart BulletPoint1 : The Czech Republic brand "Kohinol" was founded by Josef Hardtmuth in Vienna in 1790 BulletPoint2 : colours charts acrylic colors GB BulletPoint3 : 9999001627GB BulletPoint4 : SUPER FUJI COLOR BulletPoint5 : COLOR CHART ExternallyAssignedProductIdentifier : 4814005065720 ExternallyAssignedProductIdentifier1 : 0635323765529 ExternallyAssignedProductIdentifier2 : 635323765529 ItemName : Camera Lens Focus Calibration Card AF Micro Alignment Ruler Folding Chart ItemPackageDimensions_Height : 29.8 centimeters ItemPackageDimensions_Length : 0.1 centimeters ItemPackageDimensions_Width : 21 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : photographic-light-meter-color-calibration-charts Manufacturer : Deeoee Material : Copper ModelNumber : 9999001627GB PartNumber : DeMixelecB_10974 ProductDescription : Descriptions:
Features:
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 cameras, this feature is known as "AF Fine Tune". On and cameras, it's known as "AF Micro Adjustment". Please refer to your camera's instructions manual to see if this feature is present.
How to use: Set up the ruler. 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. 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 crosshair at the center of the ruler, then take a photo. 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. 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.