G.Zuiko Auto-W 20mm f/3.5
![](../../../../assets-content/classic-analogue-cameras/olympus-pen-f-series/images/135/20140509-0001.jpg)
Olympus Pen F G.Zuiko Auto-W 20mm f/3.5 mounted on an Olympus Pen FT
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220919-0001.jpg)
Olympus Pen F G.Zuiko Auto-W 20mm f/3.5 mounted on a Sony A7 MkII
![](../../../../assets-content/classic-analogue-cameras/olympus-pen-f-series/images/135/20140509-0062.jpg)
Olympus Pen F G.Zuiko Auto-W 20mm f/3.5
Cropping needed? Yes
Average 35mm equivalent focal length after cropping: 28mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0008-OOC+EC.jpg)
20mm f/3.5 image 1 - OOC+EC
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0008-Cropped.jpg)
20mm f/3.5 image 1 - Cropped
Image size: 12.3mp
35mm equivalent focal length: 28mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0008-Edit-Final.jpg)
20mm f/3.5 image 1 - Final
Image size: 15.4mp
35mm equivalent focal length: 25mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0033-OOC+EC.jpg)
20mm f/3.5 image 2 - OOC+EC
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0033-Cropped.jpg)
20mm f/3.5 image 2 - Cropped
Image size: 13.6mp
35mm equivalent focal length: 27mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0033-Edit-Final.jpg)
20mm f/3.5 image 2 - Final
Image size: 13.9mp
35mm equivalent focal length: 27mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0034-OOC+EC.jpg)
20mm f/3.5 image 3 - OOC+EC
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0034-Cropped.jpg)
20mm f/3.5 image 3 - Cropped
Image size: 13.6mp
35mm equivalent focal length: 27mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0034-Edit-Final.jpg)
20mm f/3.5 image 3 - Final
Image size: 12.3mp
35mm equivalent focal length: 28mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0050-OOC+EC.jpg)
20mm f/3.5 image 4 - OOC+EC
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0050-Cropped.jpg)
20mm f/3.5 image 4 - Cropped
Image size: 13.6mp
35mm equivalent focal length: 28mm
![](../../../../assets-content/outlandish-lenses/classic-lenses/olympus-pen-f-lenses-on-full-frame-digital/20mm-f3.5/images/135/20220918-0050-Final.jpg)
20mm f/3.5 image 4 - Final
Image size: 14.1mp
35mm equivalent focal length: 27mm
This is the widest lens Olympus made for the Pen F system. On the half-frame cameras it was designed for it has a 35mm equivalent focal length of 28mm. The edge of the imaging circle is clearly visible with this lens and cropping to exclude all but a little easily correctable vignetting did not allow any extra field of view, so the 35mm equivalent focal length of these lenses remains at 28mm. But a combination of changing the aspect ratio to 4:3 and the use of tools for the correction of converging verticals allows a slightly wider crop (often giving a 35mm equiv. focal length of 25mm). For some images I have cropped in a little further for the 'finished' version resulting in a sightly longer 35mm equiv. focal length.