Depth of field doesnt change significantly after 70mm. When u go from a short lens to a longer lens but keep the framing same, The DOF decrease due to the increased focal length tracks nearly with the DOF increase due to the further distance from the subject. Unless u are doing real shallow DOF photos with 50 mm or 35 mm lens you should not worry about it.

Thanks everybody for your comments. I think I finally understand why telephoto lenses SEEM to shorten DOF. It's really just that you are inclucing less background.

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Shallowdepth of field

I found some information on the internet about how to calculate your depth of field given your format (35mm or other), lens length, focal length, and aperture. It assumes print sizes of 8x10". It also assumes a single element lens, but is supposed to be pretty accurate for most lenses at a moderate focusing distance.

So aperture is one thing to control and the second thing to control is how blurred u want your backgrounds to be. To get the best control, keep your backgrounds out of the DOF area and then select the focal length that will seem to reduce or increase the sharpness of the background area to your liking.

Depth of field vs focal lengthphotography

The ratio of a lens's focal length to its aperture diameter. A low ƒ/# means a larger aperture area, which results in a higher light or infrared collecting ...

Conversely then, wouldn't a telephoto lens actually include more foreground objects, make them appear smaller, and therefore in better focus?

Rather what most people worry is the Bokeh of the background. I wont go into what is better, but just to give an explanation, the out of focus shape of a small point of light area in the background is different for different lenses.

Depth of field vs focal lengthreddit

The only real difference you'll see is from the slightly different background.A longer lens for example with have a very narrow view of the background while a wide lens sees alot more ,even though the subject is framed identically

Focal lengthanddepth of fieldchart

Also if the background is outside of the DOF field of the lens, the blur *SEEMS* more prominent in a longer lens because the same blurred takes up more print area when using a longer lens. This is because by definition, when the subject framing is exactly the same the background covered by the lens will be larger for wider lenses giving an illusion of more sharpness.

Define 'MTF'. See more meanings of 'MTF' with examples.

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Depth of fieldcalculator

Lens surfaces coated with special anti-reflection coatings will reduce light loss and are particularly useful for low-level light applications. Magnification:.

Relationship betweenfocal lengthanddepth of field

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BUT...Once you start using the same framing (same magnification)for different lenses,then DOF will be identical at any given aperture

The surface of an aspherical lens can never be part of a sphere or cylinder. The curve changes in certain parts of the lens surface to focus the light better.

Of course if the shorter FL lens is focused at its HFD and the longer one isn't, the difference in DOF will be even greater since the back DOF at HFD is infinity.

Depth of fieldphotography

The statement that DOF doesn't depend on focal length but only on magnification and aperture is correct except when the focusing distance for one of the focal lengths is near the hyperfocal distance and the other one isn't. If both are focused at 1/8 the hyperfocal distance or closer, then the DOFs are essentially equal (for the same mag & f-number). If one is focused at 1/4 HFD or further then the differences start to become significant.

Two Rules of Thumb. Generally, the smaller and more detailed your design, the smaller your lens' focal diameter should be. For instance, we recommend using a ...

Depth of field vs focal lengthcamera

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Using this information, I made a spreadsheet to verify my test results. At the closest focusing distance and widest angle of view (@28mm), my DOF is calculated to be about 600mm. At my farthest focusing distance and narrowest angle of view (@75mm), my DOF is calculated to be just over 500mm. Also, beyond the 75mm focal lenght point, there is almost no change in DOF. So, interestingly, at least according to these simplified calculations, DOF actually does change, but perhaps not enough to make that much of a difference (especially since 75mm is the MINIMUM focal length a portraint photographer would consider). It appears that the best way to affect DOF is to change your aperture size.

James P. - That's a good article. I especially like how he enlarged the image of the building from the wide shot to show you that its focus was the same as in the telephoto shot.

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For example 50 and 100mm lenses focused at a distance to give a magnification of 0.012 (or imaging a 5 ft high subject on 18mm of film). At f/16 the 50mm lens has a total DOF (front to back) of about 66 feet, and the 100mm lens has a total DOF of only about 27 ft. This would be significant for a landscape scene.