Steven Scanner

4-Feb-2013, 08:39

I’ve made a DIY camera (no reproduction, no standard dimensions). All I’ve got is the front standard size, the rear standard size and the base length. I’ve made a paper version that works, but it’s a bit to short and the dimensions are a bit off, due to the zigzag pattern that doesn’t line up.

I want to make one out of blackout curtain and cardboard (or something like that), but I want this one to be perfect. How do you determen the dimensions?

I made the paper version like this: first I drew a trapezoid with the length of the front standard at one end and the length of the rear standard on the other end. Distance bitween them 1 ½ the base length. Then I did the same with the sides and lined the edges up, forming a Chinese fan. Next I drew a zigzag pattern over the edges of the line. A 90 degree zigzag, 45 degrees offset from the lines. Than I drew parallel lines from every corner of the zigzag pattern to the other side. (I’ve got pictures, but have to look into my archives for them)

What I realised afterwards is that I forgot the part that connects to the camera. I need flaps of cloth to connect to the camera. Also, how many segments do I need?

When unfolded, every segment is at a 45 degree angle. I used Pythagoras to determen the length of the unfolded bellows. Length of the base quared, plus LOB squared and than quare root, comes to 1,41 times the length of the base. I used 1 ½ times so in theory the bellows should never overstretch. Is that right, or should I need another formula?

I want to make one out of blackout curtain and cardboard (or something like that), but I want this one to be perfect. How do you determen the dimensions?

I made the paper version like this: first I drew a trapezoid with the length of the front standard at one end and the length of the rear standard on the other end. Distance bitween them 1 ½ the base length. Then I did the same with the sides and lined the edges up, forming a Chinese fan. Next I drew a zigzag pattern over the edges of the line. A 90 degree zigzag, 45 degrees offset from the lines. Than I drew parallel lines from every corner of the zigzag pattern to the other side. (I’ve got pictures, but have to look into my archives for them)

What I realised afterwards is that I forgot the part that connects to the camera. I need flaps of cloth to connect to the camera. Also, how many segments do I need?

When unfolded, every segment is at a 45 degree angle. I used Pythagoras to determen the length of the unfolded bellows. Length of the base quared, plus LOB squared and than quare root, comes to 1,41 times the length of the base. I used 1 ½ times so in theory the bellows should never overstretch. Is that right, or should I need another formula?