View Full Version : Minimum Focus Distance

Jim Jirka
24-Oct-2006, 12:42
If I have 359mm of bellows draw, what is the minimum focus distance for a 300mm lens?

It may be easy to figure out but not for me.

Thanks in advance,


Eric Woodbury
24-Oct-2006, 12:51
I hope I get this right.

1/fo + 1/fi = 1/f

f = focal length
fo = object distance
fi = image distance (bellows draw)

About 1.8 meters to answer your question.


Jim Jirka
24-Oct-2006, 13:08
Thanks Eric. I got 1875.0 but didn't know what I had. Didn't know it was mm.