Photography Q
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- JamesBoynton
Just reading this about focal length having no real world bearing on DOF - http://www.luminous-landscape.co…
Am I being stupi or is this simply because he is moving further away from the subject which means the DOF gets larger... So basically moving back (and giving a wider dof) is offsetting the fact the focal length is going up (and giving a shorter dof)?
- aldebaran0
You got it.
- JamesBoynton0
Ahh nice, seemed like too obvious a point but I don't know enough to assume anything. Thanks aldebaran!
- Dodecahedron0
That is not a gremlin that is a mogwai.
- JamesBoynton0
Correct. I thought the same, an important distinction.
- vaxorcist0
Focal length affects field of view (crop)
Distance and aperture affect Depth of fieldIf you shoot a 50mm lens at f5.6 at 10 feer
Ft 10 feet and a 200mm lens at f5.6 at 10 feetYou will see the same depth of field if you crop the 50mm image so ut looks the same as the 200mm shot except grainier
- sorry for the typos... wrote this on my android... oddball autocorrect funvaxorcist
- evanburke0
James you missed the entire point of the article.
The DOF never changes across those examples, it stays the same. The tower is blurred in the exact same way at any distance / focal length.
- JSK0
^ true it would seem as thought keeping the subject at constant will create DOF objects at constant. Length of the lens determines how close the DOF objects are in the frame.
But I think that he is only focusing on the tower and seeing how blurry it is. The DOF does change with objects not in infinite.
Additionally, the DOF is based on not two points but multiples of points with the frame distance. Also need to consider the performance of the camera and lens. If the camera was a better camera with superior sensor and lens being much sharper, would it make a difference?
I find this article quite confusing.
This would make a great article on how length of lens can change perspective of subjects and objects in distance.
- JamesBoynton0
Evanburke, I know the DOF is the same, but I was wondering is the same because as well as changing focal length he is also moving away from the subjects... Both of these affect the DOF.
- jaylarson0
synchronic post i just got. thought id share:
lens length and other factors.
http://www.picturecorrect.com/ti…
- nb0
Thanks for the link! I just threw away all my lenses, except one! Wish I had known this sooner!