Making, Petal Lens Hood.

I have a camera SONY DSC-HX200v that hasn't any lens hoods, but I feel block the sun light when taking pictures at ground daytime.
So, I try making the Petal Lens Hood.

The steps show to making Petal Lens Hood.
   1. Measure AOV.
   2. Measure camera lens part size.
   3. Make 3D objects data.
   4. Printing!
To make way show the details each steps as follows.

1. Measure AOV
"AOV" stands for Angle Of View, each camera has individual AOV.
I can measure AOV in simple method. The simple method needs a graph paper(1mm size), a tripod. Graph paper spreads your desk, camera attached tripod brings your desk side. Camera lens turn desk surface, so can take graph paper with horizontal.
This method find extent image size(X, Y) from took pictures graph paper grid number, and took pictures differ several height.
In taking pictures,
Keep zoom position, Keep tripod positions exempt height position.

I take pictures in three height positions from the desk surface.
   10mm from surface. X=40.5, Y=30.5
   30mm from surface. X=65.0, Y=49.0
   60mm from surface. X=103.5, Y=79.0
Those data use in third step.


2. Measure size camera lens part.
Fitting petal hood, lens outside diameter measures in accurate, but actual printing size may need to adjust from your 3D printer or slicing programs ability.
I try, it was made ABS material, that is apt to shrinking to cool. I expand 0.25mm size of lens fitting diameter.

3. Make 3D objects data.(With 123D DESIGN)
This petal lens hood was made three part objects and shaped from an AOV object.
Fitting part, step2 was measure size of lens cylinder.
Shape petal hood, as you like its diameter size of cylinder, making detailedly shpae petal later.
Other part is joint two part shape taper.
Besides, an AOV object need making petal shape. AOV object is made from step 1 three X/Y data. Using Sketch draw real size three rectangles and place sketch objects actual relative position(under 60mm, middle 30mm, top 10mm image rectangles). Selected three sketch objects and use Loft, a trapezium pyramid appear there. It is DSC-HX200v actual AOV. I take margin with AOV, use Scale expand X and Y times 1.1, doesn't Z scale changing.
Petal base make a cylinder style object. Cover the cylinder with a pyramid top, and point of cylinder cut into pyramid(move Z down).
Using Subtract subtract a pyramid object from a cylinder object.
Don't you think petal shape?
Petal's edges and corners chamfer using Fillet.
Finishing, attach petal part on taper part, these on fitting part

4. Printing!
Do your best and leave the rest to Providence.

Result!

Documents. (At a later date)
   123d design
   STL