How to measure the image angle under water?
Posted 12 February 2003 - 02:41 AM
I developed a wide conversion lens for oly-3030 and PT005.
Here is a sample photo I took at Kushimoto in Japan.
It is detachable under water and I can take ultra-wide (weitwinkel) view like this!
I want to know its image angle. Does anyone know how to determin it under water?
Posted 12 February 2003 - 04:01 PM
Posted 13 February 2003 - 05:09 AM
E10/Titan housing/1 x Sea & Sea 90 Duo
Posted 20 February 2003 - 06:22 AM
Thanks Mark. I just want to take "full-circle fisheye" photos under water with digital camera. Some photographer take full-circle fisheye photos with SLR camera, but it needs a big lens and a dome port. They does not change lenses under water. Therefore I started to develop full-circle fisheye conversion lens which is detachable underwater! Now I can take much wider photo with my conversion lens than INON's one.
Anyway, I will measure the image angle according Cybergoldfish's method in April or May and then I will report it here.
Posted 21 February 2003 - 01:50 PM
Check out the bowed legs of the oil rig in the following:
This effect is minimized if the lines are close to being radials from the center of the lens:
As for measuring the view angle of the lens, I can't think of an easier way than what was mentioned. You might use the corners of a rectangular pool, at least they're already in place.