Canon Digital Photography Forums  

Go Back   Canon Digital Photography Forums > 'Equipment Talk' section > Canon EF and EF-S Lenses
Register Rules FAQ Members List Search Today's Posts Mark Forums Read



Reply
 
Thread Tools Display Modes
Old 25th of September 2011 (Sun)   #1
Higgs Boson
Senior Member
 
Join Date: Jan 2011
Location: San Antonio, Texas
Posts: 1,888
Default Lens MM vs actual distance

On a ff camera, how many feet closer would I be standing to a subject if I compared a 35mm to a 100mm to 200mm to 300mm to 400mm if each was like looking through only my eyes?

In other words, how many feet would I have to walk to make up the distance between each lens?

I am trying to decide what lens to get that is longer than my 70-300..... 400? 500? This is how I will figure it out. Thanks.
__________________
A7R | EM-1 | EM-5 | 7.5 | 17 | 21 | 60 | 75 | 12-40 | 70-200G | E640x2 | ABR800 | 580EXII
Higgs Boson is online now   Reply With Quote
This ad block will go away when you log in as member
Old 25th of September 2011 (Sun)   #2
JeffreyG
"my bits and pieces are all hard"
 
JeffreyG's Avatar
 
Join Date: Jan 2007
Location: Detroit, MI
Posts: 14,228
Default Re: Lens MM vs actual distance

Changing the focal length will not make the subject appear closer, it will make the subject appear larger. Those are two differenct concepts.

If you double the focal length, the subject will appear twice as large on the sensor. So going from a 300mm lens to a 600mm lens (for example) would make a subject that filled half the frame now fill the entire frame.
__________________
My personal stuff:http://www.flickr.com/photos/jngirbach/sets/
Commercial sports:http://girbach.zenfolio.com/
I use a Canon 5D and 1DIV and a Panasonic GF-1 Gear List: http://photography-on-the.net/forum/...postcount=1550
JeffreyG is offline   Reply With Quote
Old 25th of September 2011 (Sun)   #3
Higgs Boson
Senior Member
 
Join Date: Jan 2011
Location: San Antonio, Texas
Posts: 1,888
Default Re: Lens MM vs actual distance

What I am trying to gauge is if a subject fills the frame of 100mm lens at 10 yards, what focal length would I need to fill it at 300 yards? Approx 500mm?
__________________
A7R | EM-1 | EM-5 | 7.5 | 17 | 21 | 60 | 75 | 12-40 | 70-200G | E640x2 | ABR800 | 580EXII
Higgs Boson is online now   Reply With Quote
This ad block will go away when you log in as member
Old 25th of September 2011 (Sun)   #4
juanpafer
Senior Member
 
juanpafer's Avatar
 
Join Date: May 2009
Location: Louisville, KY
Posts: 1,731
Default Re: Lens MM vs actual distance

Another useful guide is knowing that if you want an object that is covering the short side of your sensor to cover the long side of it, you need 1.4x.
In the case of your 70-300 at 300mm, that would be 420mm.
__________________
Juan
juanpafer is offline   Reply With Quote
Old 25th of September 2011 (Sun)   #5
JeffreyG
"my bits and pieces are all hard"
 
JeffreyG's Avatar
 
Join Date: Jan 2007
Location: Detroit, MI
Posts: 14,228
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by Higgs Boson View Post
What I am trying to gauge is if a subject fills the frame of 100mm lens at 10 yards, what focal length would I need to fill it at 300 yards? Approx 500mm?
100mm lens, 10 yards fills the frame.

300 yards is 30 times the initial distance to the subject, so to fill the frame with the same subject at 300 yards would require a 3000mm lens (100mm x 30).

Another way to think of this, starting again from 100mm lens and 10 yards, if you changed to a 500mm lens (5X the focal length) you would get the subject to appear the same size by moving back 5X the distance. So a 500mm lens would show the subject the same size at 50 yards (10 yards x 5).
__________________
My personal stuff:http://www.flickr.com/photos/jngirbach/sets/
Commercial sports:http://girbach.zenfolio.com/
I use a Canon 5D and 1DIV and a Panasonic GF-1 Gear List: http://photography-on-the.net/forum/...postcount=1550
JeffreyG is offline   Reply With Quote
Old 25th of September 2011 (Sun)   #6
juanpafer
Senior Member
 
juanpafer's Avatar
 
Join Date: May 2009
Location: Louisville, KY
Posts: 1,731
Default Re: Lens MM vs actual distance

This is a good tool to make this type of calculations:
http://www.giangrandi.ch/optics/lenses/focalcalc.html
__________________
Juan
juanpafer is offline   Reply With Quote
Old 25th of September 2011 (Sun)   #7
SkipD
Cream of the Crop
 
SkipD's Avatar
 
Join Date: Dec 2002
Location: Southeastern WI, USA
Posts: 19,677
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by Higgs Boson View Post
What I am trying to gauge is if a subject fills the frame of 100mm lens at 10 yards, what focal length would I need to fill it at 300 yards? Approx 500mm?
Are you aware of how distance between the camera (or your own eyes) and the various elements in the scene in front of it/you affects perspective?

There's a lot more to composing good photographs than just filling the frame with "the subject".
__________________
Skip Douglas
A few cameras and almost 50 years behind them .....
..... but still learning all the time.
SkipD is offline   Reply With Quote
Old 25th of September 2011 (Sun)   #8
Higgs Boson
Senior Member
 
Join Date: Jan 2011
Location: San Antonio, Texas
Posts: 1,888
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by JeffreyG View Post
100mm lens, 10 yards fills the frame.

300 yards is 30 times the initial distance to the subject, so to fill the frame with the same subject at 300 yards would require a 3000mm lens (100mm x 30).

Another way to think of this, starting again from 100mm lens and 10 yards, if you changed to a 500mm lens (5X the focal length) you would get the subject to appear the same size by moving back 5X the distance. So a 500mm lens would show the subject the same size at 50 yards (10 yards x 5).
Ok so it isn't a doubling rule like stops, lol. It only works once, not exponentially. I guess I can't take pictures of stuff that far away.
__________________
A7R | EM-1 | EM-5 | 7.5 | 17 | 21 | 60 | 75 | 12-40 | 70-200G | E640x2 | ABR800 | 580EXII
Higgs Boson is online now   Reply With Quote
Old 25th of September 2011 (Sun)   #9
Higgs Boson
Senior Member
 
Join Date: Jan 2011
Location: San Antonio, Texas
Posts: 1,888
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by SkipD View Post
Are you aware of how distance between the camera (or your own eyes) and the various elements in the scene in front of it/you affects perspective?

There's a lot more to composing good photographs than just filling the frame with "the subject".
Yes yes, you throw down the perspective concept in all of my threads, lol. There is more involved than just composition when you are taking pics of stuff really really far away and want subject isolation. If I am in a deer blind 50 feet off the ground and a deer is 250 yards away and I want to see the whites of his eyes, perspective of the tree behind it is not my main concern.

Game management is not about trees as much as antlers....
__________________
A7R | EM-1 | EM-5 | 7.5 | 17 | 21 | 60 | 75 | 12-40 | 70-200G | E640x2 | ABR800 | 580EXII
Higgs Boson is online now   Reply With Quote
Old 25th of September 2011 (Sun)   #10
DreDaze
Cream of the Crop
 
DreDaze's Avatar
 
Join Date: Mar 2006
Location: S.F. Bay Area
Posts: 14,484
Default Re: Lens MM vs actual distance

check out this link:
http://www.juzaphoto.com/eng/article...omparisons.htm

at the bottom there's a calculator so you can plug in the dimensions of your shot at 300mm, and it'll show you how much to crop to give an example of what 400/500mm would give you
__________________
Andre or Dre
gear list
flickr
DreDaze is offline   Reply With Quote
Old 25th of September 2011 (Sun)   #11
SkipD
Cream of the Crop
 
SkipD's Avatar
 
Join Date: Dec 2002
Location: Southeastern WI, USA
Posts: 19,677
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by Higgs Boson View Post
If I am in a deer blind 50 feet off the ground and a deer is 250 yards away and I want to see the whites of his eyes, perspective of the tree behind it is not my main concern.

Game management is not about trees as much as antlers....
I fully understand. Your questions, though, didn't really steer our thinking in this direction.
__________________
Skip Douglas
A few cameras and almost 50 years behind them .....
..... but still learning all the time.
SkipD is offline   Reply With Quote
Old 26th of September 2011 (Mon)   #12
Higgs Boson
Senior Member
 
Join Date: Jan 2011
Location: San Antonio, Texas
Posts: 1,888
Default Re: Lens MM vs actual distance

Fair enough. I appreciate your help as always.
__________________
A7R | EM-1 | EM-5 | 7.5 | 17 | 21 | 60 | 75 | 12-40 | 70-200G | E640x2 | ABR800 | 580EXII
Higgs Boson is online now   Reply With Quote
Old 26th of September 2011 (Mon)   #13
number six
"After 40 years still not housebroken, I still piddle on the carpet"
 
number six's Avatar
 
Join Date: May 2007
Location: San Francisco Bay Area
Posts: 8,736
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by Higgs Boson View Post
Game management is not about trees as much as antlers....
Quote:
Originally Posted by SkipD View Post
I fully understand. Your questions, though, didn't really steer our thinking in this direction.
As long as we're being technical, steers don't have antlers. They have horns.

You're welcome.
__________________
"Be seeing you."
50D - 17-55 f/2.8 IS - 18-55 IS - 28-105 II USM - 60 f/2.8 macro - 70-200 f/4 L - Sigma flash
I do not piddle on the carpet!
number six is offline   Reply With Quote
Old 26th of September 2011 (Mon)   #14
You-by-Lou
Senior Member
 
You-by-Lou's Avatar
 
Join Date: Aug 2011
Location: Manhattan
Posts: 1,687
Default Re: Lens MM vs actual distance

Oh dear
__________________
You may say I'm a Zoomer, But I'm not the only one


Canon 5D mkIII
135L my new favorite
You-by-Lou is offline   Reply With Quote
Old 26th of September 2011 (Mon)   #15
Higgs Boson
Senior Member
 
Join Date: Jan 2011
Location: San Antonio, Texas
Posts: 1,888
Default Re: Lens MM vs actual distance

Quote:
Originally Posted by number six View Post
As long as we're being technical, steers don't have antlers. They have horns.

You're welcome.
Booooo! If I had a tomato it would be heading your direction.
__________________
A7R | EM-1 | EM-5 | 7.5 | 17 | 21 | 60 | 75 | 12-40 | 70-200G | E640x2 | ABR800 | 580EXII
Higgs Boson is online now   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
EF 300 f/4L IS II patent - actual lens release? nikmar08 Lens Rumors and Predictions 8 26th of May 2011 (Thu) 22:16
Bees, Dragonfly..Now with an actual macro lens. RLopez Macro 15 1st of August 2008 (Fri) 17:09
lens distance to actual distance trailblazer Canon EF and EF-S Lenses 22 21st of January 2008 (Mon) 14:04
Lens for Canon A series: Are Opteka and HD Pro good alternatives to actual Canon Lens snapmacro Accessories & Storage 3 26th of January 2007 (Fri) 00:00
Lens Focal Length - Difference between actual and advertised? RodneyCyr Canon EF and EF-S Lenses 3 11th of December 2005 (Sun) 03:28


All times are GMT -5. The time now is 12:25.


Powered by vBulletin® Version 3.6.12
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
This forum is not affiliated with Canon in any way and is run as a free user helpsite by Pekka Saarinen, Helsinki Finland. You will need to register in order to be able to post messages. Cookies are required for registering and posting. HTML in messages is not allowed, plain website addresses are automatically made active by the board.