This works great, Michelle. It's not as dramatic as my example (that's because there is a greater difference in distance between my subject and the background than the the the distance between your subject and the background) Still, you can see how the horse's head is in shard focus yet the background grass, ad to a lesser extent even the horse's leg, are out of focus. f4.5 would certainly do that.
When would this be a good idea? How about an outdoor portrait? You don't want details in the background to be a distraction from the main subject so you choice a large aperture (or small f-stop number such as 4.5) and you blur out the background.
Discussion
1 repliesWhen would this be a good idea? How about an outdoor portrait? You don't want details in the background to be a distraction from the main subject so you choice a large aperture (or small f-stop number such as 4.5) and you blur out the background.