See here for a good guide on hyperfocal distance.
Last edited by ziploc; 13th September 2009 at 11:09 AM.
Oops made a mistake while typing the link. Corrected.
Btw, here is how I would normally use the scale:
1. Choose an aperture, e.g. f/16.
2. Set manual focus mode, and turn the focusing ring so that the infinity mark aligns with the choosen aperture, f/16 in this case.
3. The center mark indicates where the focus is at, but this is for info only and you don't need to care about it.
4. The distance marking falling on f/16 at the other end is where the nearest point of which it will be in focus. Check that this is what you desire. If not, choose another aperture. and repeat from step 1.
5. Compose and shoot.
Using your lens as an example: focus and set the infinity mark to f/16, the hyperfocusing range would be ~0.5m-infinity, and the focusing point is ~1m.
Some lenses do not have any DOF scale on them. For those lenses you would need to use the hyperfocusing charts/wheel available on the DOFMaster website.
So from the picture, for F16 anything between ~0.45 to 5m will be sharp? Correct me if i am wrong.
This is actually how we derive at the hyperfocal distance. Let's think back in reverse: if we want the DOF to be from some distance x to infinity, e.g. at aperture f/16, then we'll need x to be on one side of f/16 and infinity on the other side of f/16 (remember that's how we define DOF). So, we just set infinity to f/16, and we can find out what x, and the focusing point is. Interesting isn't it?
Last edited by ziploc; 16th September 2009 at 11:10 PM.
wow... which lens is that? I've not seen that on the EF lenses I've been working on lol,
guess we entry grade DSLR users have it easy =)
not to stray off topic too much, but I was thinking of getting a sigma18-200 or tamron 18-270 VC next, so was wondering if that was a common feature on the sigma lens, and if so, probably learning how to use it would be best.
That said, my question earlier was answered, thanks for the helpful link!