Focal lengthanddepth of fieldchart

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Enter the laser power (watts) and the frequency of the laser (hz) into the calculator to determine the Laser Pulse Energy.

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Depth of fieldcalculator

Using the same process as example problem 1, we first define the needed variables outlined by the formula. In this case, the values are provide as:

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.

Depth of field vs focal lengthphotography

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

Depth of field vs focal lengthcamera

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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.

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

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.

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.

Relationship betweenfocal lengthanddepth of field

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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.

The following two example problems outline the steps and information needed in order to calculate the Laser Pulse Energy.

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 fieldphotography

C-mount is a standardized thread connection. The main advantages are: ... The only disadvantages of the C-mount lens is the size (relatively large) and the price.

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Procedure · Without disturbing the lens and screen, arrange both of them on the wooden bench. · Place the lens on the holder facing a distant object. · Place the ...

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 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.

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Depth of field vs focal lengthreddit

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.

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.

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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.

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