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Senior Member
Canon 28mm f/1.8 Sharpness
There's a lot of conversation on the internet about the sharpness from the 28mm f/1.8. I received mine yesterday and thought I'd take some sample pictures to review the sharpness at various apertures.
First, pictures of a building with a brick wall. The full scene picture is below:
![](http://farm8.staticflickr.com/7074/7318255376_2e729719ca_z.jpg)
2012_06_01_5578_upd by dthrog00, on Flickr
Now, 100% center crops, first at f/1.8
![](http://farm8.staticflickr.com/7234/7320592258_b714035920_o.jpg)
2012_06_01_5582_center by dthrog00, on Flickr
f/2
![](http://farm8.staticflickr.com/7098/7320593610_bcb1f04dd2_o.jpg)
2012_06_01_5581_center by dthrog00, on Flickr
f/2.8
![](http://farm9.staticflickr.com/8004/7320594792_558fc46b40_o.jpg)
2012_06_01_5579_center by dthrog00, on Flickr
f/4
![](http://farm9.staticflickr.com/8016/7320595926_313ff32433_o.jpg)
2012_06_01_5578_center by dthrog00, on Flickr
f/5.6
![](http://farm8.staticflickr.com/7219/7320597058_eb04795e45_o.jpg)
2012_06_01_5577_center by dthrog00, on Flickr
The f/1.8 shot is more soft than the others. The f/2 shot has sharpened up quite a bit with improved contrast. I would say the f/2 shots and beyond have acceptable sharpness even at 100%. But, if I post process the f/1.8 shot can I get to look as good as the f/2 (update levels and apply unsharpen mask amount 75%, radius 2, threshold 3)?
![](http://farm8.staticflickr.com/7212/7323936906_76f7ff3b5d_o.jpg)
2012_06_01_5582_center_sharpened by dthrog00, on Flickr
In my opinion it is pretty close. But what about the mid-frame section of an APS-C camera with the lens wide open at f/1.8? The original shot is below:
![](http://farm9.staticflickr.com/8005/7320614496_0e60361003_z.jpg)
2012_06_01_5564_resized by dthrog00, on Flickr
The 100% crop of the cat's face is below:
![](http://farm9.staticflickr.com/8155/7320616092_e49756c69a_o.jpg)
2012_06_01_5564_midframe by dthrog00, on Flickr
The shot as a whole looks ok, but there's no question the cats eye has a soft "haze" to it. I sharpened it (amount 75%, radius 2, threshold 3) below.
![](http://farm8.staticflickr.com/7233/7323938376_53f306e671_o.jpg)
2012_06_01_5564_midframe_sharpened by dthrog00, on Flickr
Is it perfect? No. But, the haze from the cat's eye is gone. I think the picture as a whole looks ok. So far in real world conditions I see no reason why I should be reluctant to shoot at f/1.8 if I need the faster shutter speed, although f/2 would be preferred in most circumstances.
I think the new lens is great so far and am looking forward to shoot with it more.
Dave
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