Quote:
Originally Posted by groovyone Yeah, mine looked like yours. I needed to take more time with the cutout sizing. I think I had to too small then went too big. |
According to the link I posted you figure out the size of the "hole" by taking your focal length and divide it by your aperture.
Since I was using my 70-200 this is what I calculated:
100mm/f2.8= 35mm or 3.5cm
After I cut out a circle that was 77mm in diameter (or larger) to fit over the front element of the 70-200 I made a square that was 3.5cm x 3.5cm and fit my shape into those dimensions. The square shape also has to be in the exact center for best results.