nimo956
27-Mar-2016, 13:25
I just read Ken Rockwell's article on how to choose the sharpest aperture here:
http://www.kenrockwell.com/tech/focus.htm
Could someone tell me if I did this right:
1. I measured the circumference of the focus knob of my Chamonix 4x5 as 93mm.
2. A full revolution of the focus knob moves the front standard 20mm, giving a scale factor of 93/20 = 4.65
3. This yields the following roughly:
F/16- 3mm
F/22- 6mm
F/32- 12mm
F/45- 25mm
F/64- 51mm
4. I measured a piece of paper and made the markings at those distances. Then I attached it to my focus knob. It looks like this:
148904
Did I do everything correctly? Now I just need to figure out how to use this in the field exactly!
http://www.kenrockwell.com/tech/focus.htm
Could someone tell me if I did this right:
1. I measured the circumference of the focus knob of my Chamonix 4x5 as 93mm.
2. A full revolution of the focus knob moves the front standard 20mm, giving a scale factor of 93/20 = 4.65
3. This yields the following roughly:
F/16- 3mm
F/22- 6mm
F/32- 12mm
F/45- 25mm
F/64- 51mm
4. I measured a piece of paper and made the markings at those distances. Then I attached it to my focus knob. It looks like this:
148904
Did I do everything correctly? Now I just need to figure out how to use this in the field exactly!