Making Sharper Images Workshop Focusing Materials Required By Bob Bone 4-15-17

Make the following target from foam board Make the following target from foam board. Bring this to the Making Sharper Images Workshop along with a “Yardstick” or scale to the workshop, see slide #3 Front side Back side Draw cross hatch pattern, ≈ 1/4” spacing, As shown on front side of form board Mark thick black line as shown on back of foam board Form Board ≈ 16” X 20” Glue foam board piece to backside of larger form board, ≈ 2” X 4” as shown Bob Bone

Calibrating or Verifying Your Focus Set-up Focusing target X Field of view in view finder Camera with Lens / Extender, etc. Scale / yardstick, etc. Adjust focus for DOF zone here Rear focus Front focus Side view Target and shelf for scale Focus Point Sharp focus Test Scale Front view of target Foam Board 90° Scale / yardstick, etc. Focusing Point DOF Use largest aperture possible to perform this test, keeping the DOF small - 1” to 2” max DOF=Depth of Field Bob Bone

Workshop’s Post Presentation Hands-on Activities Review your camera’s AF settings AI Servo* 1st image priority set to focus AI Servo 2nd image priority set to focus One-Shot AF release priority set to focus Discover where your camera focuses (Use backside of focus target, slide #7) Does your lens / camera front or rear focus? (Use front side of focus target, slide #3 and #8) Adjust or verify where your camera focuses * Continuous focus for Nikon cameras Bob Bone

AF Priority Settings Example* Your camera’s default setting are not focus priority *Canon 7D II example Bob Bone

Discovering Where Your Camera Focuses With Camera on a tripod and pointing to the left of the focus target’s vertical line (Backside of target, Slide #7) Press the shutter button; no exposure should take place Slowly pan the camera right towards the vertical line while pressing the shutter button As you approach the vertical line, the camera should release the shutter, as soon as this happens stop the panning Draw a line on a piece of paper where the edge of the focus zone in your viewfinder is vs. the vertical line on the target See example to the right. Is it scenario “A” or “B”? Repeat for opposite side, panning to the left Rotate target and repeat for the two vertical sides, top and bottom, see next slide #7 A B See next slide Bob Bone

Discovering Where Your Camera Focuses Four steps with simulated results. Final results should resemble this Step #1 Step #2 Step 4 results Note: Your camera should not release the shutter until the focus square touches the black mark Step 2 results Step 1 results Step #3 Step #4 Step 3 results This will show where your camera really focuses Bob Bone

Calibrating or Verifying Your Focus Set-up focus target, front side towards camera, make sure the target is 90 degrees and perpendicular to the camera Place yard stick / scale on ledge as shown Align the “yard stick” so the ≈ 18” mark or center scale of scale is at the front edge of the target (Note: red down arrow) This is your focus reference mark DOF = Depth of Field Use largest aperture possible to perform this test, keeping the DOF small - 2” to 3” max. Move camera closer or further away as required DOF Side view 90° X Field of view in view finder Camera with Lens / Extender, etc. on tripod Scale / yardstick, etc. Adjust focus for DOF zone here Rear focus Front focus Camera’s focus zone Front view Bob Bone

Calibrating or Verifying Your Focus - adjustment values move focus in this direction Use largest aperture possible. Set image quality to and record your current micro-focus settings if available Take one image of the target. Is your camera front or rear focused? Adjust micro focus setting by two increments and repeat step #2, “+” values move the focus further away from the camera. See scale figure at right. Repeat steps 2 & 3, adjusting the micro focus values to obtain the reference mark in focus. Record this value on a sheet of paper. Take 9 more photos – do not touch lens’ focus ring. This will give you a total of 10 photos for the final adjustment value / review. Review the images to determine if they are centered around the focus reference mark. Repeat test as required to obtain “B” distribution by changing settings. Focus reference mark Back focus zone Front focus zone “A” “B” “C” Camera’s focus zone Yard stick / Scale *Tape scale to table top + adjustment values move focus in this direction * Bob Bone