-
At What Focal Length? (85mm f/1.8 vs 70-200mm f/4L)
I was wondering, at what focal length with the 70-200mm f/4L will I'll be able to recreate the 'light blur' size of the 85mm f/1.8? (Both wide open so bokeh should be rather similar?).I came across this equation online that I wanted to confirm.
It said that if I wanted to recreate the same size 'light blur' I would have to have an equivalent 'blur disk' size which is calculated by Focal Length / Aperture.
So if I wanted to mimic the 85mm @f/1.8 - 85/1.8=47.22
I would have to have roughly 189mm @f/4 - 189/4=47.25
The camera to subject distance was obvious, but does this calculation assume that the subject to background distance remains the same?
Posting Permissions
- You may not post new threads
- You may not post replies
- You may not post attachments
- You may not edit your posts
-
Forum Rules