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.
The calculation can be used for any camera format and will give results with numbers relevant to that format (not converted to 35mm equivalent).
Please fill all required fields

The most precise calculation, using the image sizes from before and after stitching the panorama.   A simple conversion for when you know the focal length you are approximating.    
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 photo (composition, perspective, and depth-of-field) in a single shot.      
   





Calculator created by Michigan wedding photographer Brett Maxwell