The Canon EF 85mm f/1.8 USM Lens is relatively inexpensive but yields very good image quality. It is reasonably sharp wide open, but really shines from f/2.8 on.
Wide open, vignetting will be apparent even on a 1.6x FOVCF body. Full frame body users will see some vignetting remaining at f/2.
Open the 85 f/1.8's aperture wide and watch the background blur away. The bokeh (background blur quality) - helped by an 8-blade aperture - is very nice. Of course, taking a relatively close portrait photo at f/1.8 makes keeping both eyes in focus difficult.
Contrast and saturation are very good.
Utilizing ring USM (Ultrasonic Motor), the Canon EF 85mm f/1.8 USM Lens focuses fast and quietly.
Build quality of the 85 f/1.8 is quite good. The size is small, the weight is light. The 85 f/1.8 is a lens you can use to get great pictures while getting few stares.
Positioned above from left to right in their fully retracted positions are the following lenses:
Canon EF 50mm f/1.4 USM Lens
Canon EF 85mm f/1.8 USM Lens
Canon EF 100mm f/2.0 USM Lens
Canon EF 135mm f/2.0L USM Lens
Canon EF 24-70mm f/2.8L USM Lens
The same lenses are shown below in their fully extended states with their lens hoods in place.
Positioned above from left to right are the following lenses:
Zeiss 85mm f/1.4 ZE Planar T* Lens
Canon EF 85mm f/1.8 USM Lens
Canon EF 85mm f/1.2L II USM Lens
Sigma 85mm f/1.4 EX DG HSM Lens
The same lenses are shown below in their fully extended states with their lens hoods in place.
An application where the Canon EF 85mm f/1.8 USM Lens shines is indoor and low light photography. The 85mm focal length and wide aperture make the 85 f/1.8 a great church or stage lens. With its wide aperture and fast focusing, the 85 f/1.8 works well for indoor Sports.
This focal length is very good for portraits, and the Canon EF 85mm f/1.8 USM Lens makes a good portrait lens - excelling at head and head/shoulders portraits when mounted on a 1.3x or 1.6x FOVCF body. The wide f/1.8 aperture can create a dreamy OOF (Out of Focus) background blur.
The bottom line is that the Canon EF 85mm f/1.8 USM Lens is simply a very nice lens at a reasonable price.