28mm 1.8 sharpness

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Archive 2009 · 28mm 1.8 sharpness

Ivor Karabatko
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p.2 #1 · 28mm 1.8 sharpness

wow, you can definitely see a jump from f/1.8 to 2.0. Fascinating. It seems like once you get to 2.0 it gets decently sharp, and 2.2 seems pretty darn good.

Do the exposures and the bokeh at f/1.8 and f/2.0 differ that much? I've pushed and pulled many times with film and with the digital cameras as well, so I can't really see why someone would want to shoot at 1.8 if the sharpness is that much greater at 2.0...if the shutter speed doesn't really change much.

Nov 09, 2009 at 12:07 AM

digimies
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p.2 #2 · 28mm 1.8 sharpness

My copy of EF 28/1.8 was very soft indeed. No matter if stopped down to f5.6 and focused from tethered computer. Even with relatively 'low resolution sensor' like in 1DMKIII the result was very disappointing.

As a background I have owned the following Canon lenses: 17-40/4L (twice), 28/2.8, 35/2 (twice), 50/1.8II, 50/2.5 Macro, TS-E 90/2.8, 300/L IS (twice) and 500/4L -> they all have been miles better with image quality than my EF 28/1.8 was.

Nov 09, 2009 at 12:35 AM

fmikio
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p.2 #3 · 28mm 1.8 sharpness

Ivor Karabatko wrote:
wow, you can definitely see a jump from f/1.8 to 2.0. Fascinating. It seems like once you get to 2.0 it gets decently sharp, and 2.2 seems pretty darn good.

Do the exposures and the bokeh at f/1.8 and f/2.0 differ that much? I've pushed and pulled many times with film and with the digital cameras as well, so I can't really see why someone would want to shoot at 1.8 if the sharpness is that much greater at 2.0...if the shutter speed doesn't really change much.

True... big difference between 1.8 and 2.0.
And the exposure changes 1/3, so, I can consider no changes at all...
As for shooting at 1.8, it's really to see its limits, and for me, I think my copy is acceptable.

Thanks !

Nov 09, 2009 at 01:03 AM

David Tognazzi
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p.2 #4 · 28mm 1.8 sharpness

I have a 28mm f/1.8 as well. Mine seems not-so-good compared to the christmas still life examples here. Also, mine is loaded in CA when used to take landscape shots. It's been a nice paper weight for about 2 years now.

Nov 09, 2009 at 05:04 AM


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