The Effects Of Changing Focal Length

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11 responses to “The Effects Of Changing Focal Length”

1. 

   catlett

   Sep 9, 2013

   Your statement regarding depth of field is false and has been proved to be false over and over again. Depth of field doesn’t actually change from a wide angle lens vs a telephoto. It is a very common misconception but not true. You need to pull this video. It is spreading myths

   For proof see each of the following:

   http://www.luminous-landscape.com/tutorials/dof2.shtml

   http://www.bluesky-web.com/dofmyth.htm

   http://www.cambridgeincolour.com/tutorials/depth-of-field.htm

   http://photo.stackexchange.com/questions/16096/why-is-depth-of-field-affected-by-focal-length

   http://classicalphotography.com/PAGES/Depth_of_Field_and_Focal_Length.html

   http://digital-photography-school.com/understanding-a-consistent-depth-of-field-with-varying-focal-lengths

   Reply
2. 

   sam

   Sep 10, 2013

   same thing with perspective! Perspective isn’t influenced by focal lenght! It’s just influenced by your position…

   Reply
   1. 

      432432432

      Sep 11, 2013

      yep they should at least have a clue what they are talking about wehn they do a video.
      just look it up at wikipedia.. it´s physics.. so no wonder not one of the wannabe artist has a clue.
      changing focal length does not change perspective…

      Reply
3. 

   Bepit

   Sep 10, 2013

   I concur that Perspective changes because position is changed in order to keep the field of view constant. It is also true that one usually does keep the FoV the same, but it should be specified that perspective only changes by changing the shooter’s position. Focal length per se does not change perspective.

   Depth of field does decrease like the square of the focal length, but now only if you keep your position fixed. At constant magnification it is independent of focal length for subject distances smaller than the hyperfocal distance. So here one should specify if you are shooting a landscape (focusing far) or a portrait (focusing close).

   So the two statements (focal length changes perspective and depth of field) cannot be true at the same time, unless you focus at the hyperfocal distance of beyond. Overall nice video, but sort of misleading.

   Reply
   1. 

      32323

      Sep 11, 2013

      http://en.wikipedia.org/wiki/Depth_of_field
      the morons who made the video should have read that.

      Reply
4. 

   Charles O. Slavens

   Sep 10, 2013

   I’ve been a still or motion picture photog for over 40 years and I’m always pleased to see a really good explanation of basic concepts. Something we can all benefit from…. thanks.

   Reply
   1. 

      32323

      Sep 11, 2013

      moron.,…

      Reply
5. 

   434343

   Sep 11, 2013

   oh man…. perspective is changed because you change position.. utter fail this video….

   Reply
6. 

   catlett

   Sep 11, 2013

   The thing that is annoying about this is that I understand some goof posted it on YouTube and rubes who don’t know any better like it. A site like this should not be re-posting inaccurate information. I get that whoever on this site thought the information was correct might have initially posted it but when it is thoroughly proved that the information in the video is false then the stupid video should be pulled. Photography can be confusing enough for beginners without this site spreading nonsense.

   Reply
7. 

   Byourself83

   Sep 11, 2013

   Hmm, so his terminology is slightly off…but what I see written that is true is also too complex for a beginner to understand. This video is to show beginners the “practical” effects of lens choice or zooming.

   Reply
8. 

   Michael Turcotte

   Sep 11, 2013

   I used to be subscribed to Mike’s channel until the completely wrong videos started. Video is a fail.

   Reply