What exactly does that mean? I thought that once I set the hyperfocal distance everything from half that distance to infinity would be in good focus, am I wrong? No, that would be correct. It would be in “good” focus. Now what if you need everything from point A (up close and personal) to point B (a good distance away) to be in “sharp” focus? This is where the optimal hyperfocal distance comes into play. By the way, it’s not really an optimal “hyperfocal distance” as much as it is an optimal “f/stop” for the determined mid distance. Huh?
Ok, I see I need to explain this a bit. I came across some information (on Ken Rockwell’s site) that provided a different formula to calculate an optimal distance for a given f/stop. By using this formula, you will basically obtain “sharp” focus from point A to point B (with a few disclaimers). The disclaimers are mine, not Ken’s. I used the formula to calculate a new “Optimal Hyperfocal Distance” chart, and have been testing this all day. The results were amazing!
Here’s how it works:
1. Set the focal length you want to use on your lens.
2. With your camera on auto-focus, focus on the nearest point you want to be in sharp focus. Now look at the focal distance on the lens.
3. With the camera still on auto-focus, focus on the farthest point you want to be in sharp focus. Now look at the focal distance on the lens.
4. Switch the camera to manual focus, and dial the focus ring on the lens to exactly half way between the near focal point (step 2) and the far focal point (step 3) and estimate what this distance is. For example, if my near point read 8 ft, and the far point read 20 ft, I would set the focus ring to approximately 12-14 ft.
5. Now I go to the chart and scan across the line of distances for the focal length I set in step 1. When I find the distance that closely matches that determined in step 4, I will look to the top of the column for the f/stop to use.
6. Dial in the f/stop, frame the shot, and take it.
Ok, time for the disclaimers. If for example your near point is 20 ft, and your far point is 120 ft, then the dialed in focal point would be roughly 70 ft on my lens. Well half of 70 ft is 35 ft which is greater than our near point of 20 ft. So some adjustments are needed and some sacrifice of focal quality either at the near or far point will be necessary.
I got the best results from this when using the widest angle focal length available on my lens, and being reasonable on the near focal point.
Here’s a new table to download which works as is for 35mm film or full frame digital cameras. For those of you with the DX (1.6 crop) sensors, you will need to set your focal length on your lens, then multiply that number by 1.6 to get the focal length to use in the chart. Since the formula is rather complex, I’m not going to present it here.
Download the chart:
Optimal Hyperfocal Distance (272)
This is one to play around with and see what kind of results you get. Just be sure to always use the auto-focus to determine the near and far focal distances or the results won’t be what you would like them to be. As a note of information, when I did this with my 28-300mm lens set at 28mm, the near distance was about 8 ft, and focusing in on an object that was more than 500 ft distant gave me a reading of about 21 ft. Pretty weird, but I went with it anyway and the result was amazing. When setting the lens to 50mm and using the same focal points the auto-focus read 22 ft for the near point and 120 ft for the far point. Camera position didn’t change, focal points didn’t change. Just the focal length of the lens changed and this caused the auto-focus to read differently. Using these numbers I had a distance of 71 ft which meant my near point would not be in sharp focus – which was definitely the case when I took the shot.
Play around with it and see what you get! I would be interested to know how this works for you. Enjoy.
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UPDATE:
Here’s another way to determine the distance to get the same results. With your lens on manual focus, look at the markings on the focus ring. If you want everything from say three feet to infinity in sharp focus, put your thumbs at the edges of the marks and turn the focus ring until the alignment dot is exactly half way between your fingers (or between the 3ft and infinity marks). Estimate what this distance is in relation to the distance markings and use it in the chart to look up what f/stop to use. For example, on my 28-300mm lens, half way between 3ft and infinity is about 20ft on the focus ring markings. Using 20ft with the lens at 28mm the chart indicates an f/stop between f/8 and f/11 and based on the distances it looks like f/10 would be the best choice. Works really well and I think this is a whole lot easier (and I’m all about the easy way to do it)!
BTW, using this method and this chart (downloadable above) is far sharper than using the standard hyperfocal distance charts.