When to use different lenses? at DVinfo.net

Go Back   DV Info Net > Special Interest Areas > Alternative Imaging Methods

Alternative Imaging Methods
DV Info Net is the birthplace of all 35mm adapters.


Reply
 
Thread Tools Search this Thread
Old October 5th, 2009, 07:51 AM   #1
Regular Crew
 
Join Date: Jan 2009
Location: London, England
Posts: 183
When to use different lenses?

Sorry for the obvious question but, when using prime lenses, is it simply a case of what focal length is required? (i.e. if in small space use a small wide angle lens (e.g. 28mm) and if far away from subject use an 85mm lens?)
Tim Davison is offline   Reply With Quote
Old October 5th, 2009, 07:57 AM   #2
Trustee
 
Join Date: Sep 2003
Location: Saguenay, Québec, Canada
Posts: 1,051
Not just that, the differences in angle of view and depth of field caracteristics allow for differents compositions depending of the lens used.
__________________
Jean-Philippe Archibald
http://www.jparchibald.com - http://www.vimeo.com/jparchib
Jean-Philippe Archibald is offline   Reply With Quote
Old October 5th, 2009, 08:57 AM   #3
Regular Crew
 
Join Date: Jan 2009
Location: London, England
Posts: 183
Thanks for your reply. Could you elaborate a bit on what you mean by 'angle of view' and 'depth of field characeristics'? Do you know any links that show comparisons between shots that can be achieved?
Tim Davison is offline   Reply With Quote
Old October 5th, 2009, 09:57 AM   #4
Inner Circle
 
Join Date: Dec 2003
Location: PERTH. W.A. AUSTRALIA.
Posts: 4,356
It is a whole craft on its own.


Quick stuff :-

A "normal" lens approx 50mm for 35mm stills image and approx 30mm for motion picture image (DPs please smite me if my onfo is wrong and post corrections) confers the "normal" human field of view and perspective. - Far objects appear as far away as if seen directly by the eyeball. Close objects appear as close. Motion of subject towards and away appears normal. Motion of camera itself toward or away from subject appears normal.

A wide lens approx 24mm for 35mm stills and maybe 17mm for movie frame makes distance away from the camera appear longer than it is. Motion towards and away is accentuated or looks faster. Close-ups on faces confer a distorted look with length of face from nose to outline accentuated (longer), sometimes used for a surreal effect, ie., the POV of another persons face by a madman.

A long lens approx 85mm for 35mm still and 70mm for movie frame makes distance away from camera appear shorter. Motion towards and away seems to be slower, (classic shot with even longer lens of stumbling man perishing in desert, makes a lot of footsteps and no apparent progress, car on a dusty road, throwing up huge dust yet making slow progress ), motion of camera towards or away from subject appears slower. Close-ups on faces confer a distorted look with length of face from nose to outline appearing shorter, the face appears flatter.

Genuine DPs and camera-ops, please feel free to correct me in these comments as I am not in the full knowing of this craft by any means.

Last edited by Bob Hart; October 5th, 2009 at 10:01 AM. Reason: error
Bob Hart is offline   Reply With Quote
Old October 5th, 2009, 03:17 PM   #5
Regular Crew
 
Join Date: Jan 2009
Location: London, England
Posts: 183
Thanks once again Bob, really appreciate the response. Do you know of any videos which show the differences
Tim Davison is offline   Reply With Quote
Old October 6th, 2009, 05:35 AM   #6
Inner Circle
 
Join Date: Dec 2003
Location: PERTH. W.A. AUSTRALIA.
Posts: 4,356
That is about my lot for the knowing (or lack of knowing).

I have only picked up scraps of info here and there and joined the dots, sometimes wrongly and played with the lenses to see what happens.

I have done no formal study in this craft. I don't know of any actual videos to refer you to. Others who know much more than I, may add their piece here sooner or later.

On this page

http://www.dvinfo.net/forum/let-us-d...extreme-4.html

All of the frame grabs except one were done with a Sigma-for-Nikon 14mm f2.8 at about f3.5 - f4.

Frames are :-

1 2
3 4
----
5 6

Frame 3 was done with a Nikon 58mm f1.2 prime, also at about f4. You will observe if you look closer that the same rocks have more of a cut-out-of-cardboard look to them than the higher wide shot with the 14mm which seems to make bumps and hollows look deeper.

In Frame 1, I have sort of composed the shot similarly to Frame 3, but to get the big granite hump in background to be just that little bit off sharp in the available light and to put it where I wanted it to be - far away, I chose the 14mm.

With the 58mm, the only other lens I dragged up the hill that day, it just did not look right because I had to lower my camera position and the hump was brought closer and the edges were cropped out of frame.

A zoom would make it all a lot easier, but also make a person lazier to fire off the shot and move on without trying the variety of camera positions a prime lens forces you to do. The green moss was only about 10" or 270mm from front of lens.

Last edited by Bob Hart; October 6th, 2009 at 05:56 AM. Reason: added text
Bob Hart is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Special Interest Areas > Alternative Imaging Methods

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:22 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network