1. Lens (Long focal length)
2. Webcam CCD circuit
3. 50mm camera lens
4. 60/50mm (Diameter) PVC pipe and joints
1. 20/25mm (Diameter) PVC pipe/Joints
2. Nut & bolts
1. At first select a long focal length lens, better to use compound lens to avoid chromatic aberration. Here I used high range binocular lens, focal length is 180mm.
2. Next pick a 50mm SLR camera lens ( I have used 50mm SMC Pentax-A) and remove all the lens elements from it and keep only aperture mechanism, this is used as aperture to control the light.
3. Fix the selected lens in front of the camera lens hood, this will act as fine tune focusing (Secondary focusing). And fix about 4 inches length 50mm pipe at rear. (if u have Pantax-A lens, it fits inside 50mm pipe)
4. Take 50mm pipe joint and scratch its inner surface (to increase its inner diameter, about 2mm) so that 50mm pipe moves freely forward and backward , this is act as primary focusing.
5. Take a 60mm pipe , fix its joint at the rear end and fix the 50mm joint inside at other end. The length of the 60mm pipe you should keep according to the focal length of lens that you have selected.
6. Cut a 60mm dia foam sheet ( or similar material) and fix webcam circuit , its ccd sensor should be at the centre of foam sheet. Make the ccd area maximum dark , perpendicularly about an 35mm from ccd make 2-3mm hole, this act as secondary aperture.
(Checkout construction schematic, step -10)