The Brenizer Method is a way of creating photographs with shallow depth of field not possible with a single shot.
View Ryan Brenizer's instructional video and tips about shooting the Brenizer Method here.
This calculator will tell you the focal length and/or aperture you have effectively accomplished when stitching multiple photos together.
Please fill all required fields

The most precise calculation, using the file sizes from before and after stitching together to create the panorama.   If you know the focal length you are approximating, you can use this simple conversion to get the effective aperture.    
Inputs
Inputs
Focal length used
Focal length used
Aperture used
Aperture used
Pixel height of single frame
Equivalent focal length
Pixel width of single frame
Pixel height of cropped final frame
Output
Pixel width of cropped final frame
Effective aperture
Outputs
Effective focal length*
Effective aperture*
*The lens that would be needed to achieve the same composition, perspective, and depth-of-field using the camera used for the single frames.      
   





Calculator created by Michigan wedding photographer Brett Maxwell