What is the difference between COMPRESSION and DEPTH OF FIELD?
Mar 8, 2017 13:02:17 #
Mar 8, 2017 13:13:41 #
Please define what you mean by compression. It has several meanings in photographic circles.
Mar 8, 2017 13:16:34 #
ballsafire wrote:
What is the difference between COMPRESSION and DEPTH OF FIELD?
This will be non-technical and simple.
Look through a wide angle lens and objects closer and further seem to be spaced quite a ways apart. Telephone poles would be a good example. now look exactly the same way and position with a telephoto lens and those poles look to be very close to each other. This is compression. Actually the WA lens is the same if you held the same position. The poles in the far distance if cropped out and enlarged would look the same as the telephoto shot. The WA just shows more. Simply DOF is the range from close to far that all looks focused. Large apertures it is a shallow distance small apertures it is a greater distance of depth. This is different for different lenses but applies to each lens.
There is tons of technical mumbo jumbo and stuff if you want to fry your brain but this is the simple non-technical answer.
Mar 8, 2017 13:17:12 #
ballsafire wrote:
What is the difference between COMPRESSION and DEPTH OF FIELD?
If you're talking about on-line photos compression refers to making the photo smaller so one can ship it by e-mail. DOF (Depth of Field) is a completely different matter. This involves a technique while shooting to make the background out of focus.
Mar 8, 2017 13:35:04 #
jimmya wrote:
... (Depth of Field) is a completely different matter. This involves a technique while shooting to make the background out of focus.
i must have slept thru that class, i use manipulation of DOF to make the background "in focus".
Mar 8, 2017 13:43:09 #
Compression of distance refers to the flattening of far objects with a long lens. Far away objects may appear closer to each other that they are if one is using a long lens. It is based on distance from the subjects and length of the lens. Some good examples of this can be found in work by Andreas Feninger, one of the pioneers of using telephoto lenses.
https://www.youtube.com/watch?v=23UjjfnlDDc
https://www.youtube.com/watch?v=23UjjfnlDDc
Mar 8, 2017 13:43:23 #
oldtigger wrote:
i must have slept thru that class, i use manipulation of DOF to make the background "in focus".
It works both ways. You can increase or decrease DOF with your aperture settings.
Mar 8, 2017 13:44:58 #
oldtigger wrote:
i must have slept thru that class, i use manipulation of DOF to make the background "in focus".
Me too
Mar 8, 2017 13:52:09 #
Compression is simply the reduction of depth perception due to the lens used.
It is most noticeable in long tele objective and binoculars. In both cases focused objects lose depth or volume and appear flat.
It is most noticeable in long tele objective and binoculars. In both cases focused objects lose depth or volume and appear flat.
Mar 8, 2017 13:55:56 #
Architect1776 wrote:
This will be non-technical and simple. br Look th... (show quote)
Good answer, particularly since you left out the mumbo jumbo.
--
Mar 8, 2017 14:03:26 #
Bill_de wrote:
Good answer, particularly since you left out the mumbo jumbo.
--
--
Mar 8, 2017 14:52:07 #
oldtigger wrote:
i must have slept thru that class, i use manipulation of DOF to make the background "in focus".
Sure, you can do that too.
Mar 9, 2017 06:07:55 #
big-guy wrote:
Please define what you mean by compression. It has several meanings in photographic circles.
I was going to ask the same thing.
Mar 9, 2017 06:13:49 #
ballsafire wrote:
What is the difference between COMPRESSION and DEPTH OF FIELD?
Completely different things as you now see.
Yes, compression can also be about image digital files. JPG (JPEG) are Compressed with loss of data, TIF (TIFF) and RAW are not. Similar to comparing an audio WAV file to an MP3. Though in the case of sound, copying has no effect on the files.
Mar 9, 2017 06:21:15 #
ballsafire wrote:
What is the difference between COMPRESSION and DEPTH OF FIELD?
Taking a shot with a long tele gives a compressed look, although the DoF is the same. It is sometimes called "apparent depth of field."
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.