Exercise: Real and implied triangles

1. Triangular subject. I found this fountain in the Peterhof Gardens. It reminds me to the Christams tree because of its triangular shape which is more evident because I used a slow shutter speed to show the water movement.
   
   

   

   Camera body: Nikon d90

   Lens: Nikkor 18-55 f/3,5-5,6

   Focal length: 18 mm

   Exposure: 1/60   f/22

   ISO 640. No flash, no tripod.

   
   

2. Triangle by perspective, converging towards the top of the frame. I've used an old style narrow street as my subject in this picture and I've placed myself in the middle of the street to converge the lines as they go away and draw a triangular shape.
   
   

   

   Camera body: Nikon d90

   Lens: Nikkor 18-55 f/3,5-5,6

   Focal length: 24 mm

   Exposure: 1/15   f/8

   ISO 200. No flash, no tripod.

   
   

3. Inverted triangle by perspective, converging towards the bottom of the frame. I've choosen this picture taken in the Chicen Itza's surroundings. The picture cold be included also in the category described above (triangle created by perspective converging towards the top) if we pay attention to the piles and the floor, but in this case the saturated sky contrasts with the grey stone pile and the shape of the triangle is very marked as we can see. This effect would be clearer if the trees on the right wouldn't there. 

Camera body: Nikon d90

Lens: Nikkor 18-55 f/3,5-5,6

Focal length: 18 mm

Exposure: 1/4000   f/3,5

ISO 200. No flash, no tripod.

1- Still-life arrangement to produce a triangle with the apex at the   top.

Camera body: Nikon d90
Lens: Nikkor 18-55 mm f/3,5-5,6
Focal length: 30 mm
Exposure: 1/8   f/4,2
ISO 200. No flash, no tripod.

The triangle is drawn by the black rounded parasol and black the light meter to the blue glasscase which forms the appex of the triangle; so the appex is at the top.

 2- Still-life arrangement with the apex at the bottom.

Camera body: Nikon d90
Lens: Nikkor 18-55 mm f/3,5-5,6
Focal length: 40 mm
Exposure: 1/8   f/5,3
ISO 200. No flash, no tripod.

In the picture above the appex of the implied triangle is at the bottom, which is created by the two orange paper roses. They're so close that they form the appex. Their stems draw two of the triangle's sides, while the other sides is drawn by the imaginary line from the end of one stem to the another.

3-Three people.

Camera body: Nikon d90
Lens: Nikkor 70-300 mm f/4,0-5,6
Focal length: 130 mm
Exposure: 1/60   f/4,2
ISO 800. No flash, no tripod.

In the picture above the three people who are riding horses draw an inverted triangle.