Optimal aperture for Olympus 45mm f1.8 and Panasonic 20mm f1.7

Max

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May 18, 2014
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Hello,

In normal daylight condition what is the optimal aperture for these lenses that provide an optimal image quality / sharpness?

Thanks
 

Vivalo

Olympus loser
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Nov 16, 2010
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In general it is f4 or f5.6 with m4/3 lenses. My own subjective experience with both of those lenses is that f5.6 is the sharpest aperture but f4 won't be any softer in practice.
 

Matero

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Jun 22, 2013
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I only got 45mm and have normally been shooting with 2.2 or 2.8. Now yesterday used 4.0 almost for all shots and those show up remarkably sharper than 2.2.


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GFFPhoto

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Feb 24, 2013
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The 20 is best at 4.0, or at 2.0 depending on who you ask (although lenstip shows 2.0 to be almost as good as 4.0)

http://www.lenstip.com/269.4-Lens_review-Panasonic_G_20_mm_f_1.7_ASPH._Image_resolution.html
http://slrgear.com/reviews/showproduct.php/product/1295/cat/68

The 45 is best at 2.8 in the center, the corners are best at 4.0 (although lenstip shows a slight decrease in the center from 2.8 to 4.0)
http://www.lenstip.com/316.4-Lens_review-Olympus_M.Zuiko_Digital_45_mm_f_1.8_Image_resolution.html
http://slrgear.com/reviews/showproduct.php/product/1443/cat/14

I doubt you would notice any difference shooting either lens between 2.8 and 4.0
 

Vivalo

Olympus loser
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Nov 16, 2010
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Yeah, f4 might be the sweetspot. In practice f5.6 will give more DOF and that way more of the image will be sharper. Depends what you are trying to capture.
 

EarthQuake

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Sep 30, 2013
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F2.8-5.6 generally, in my experience for those two lenses. Though both are quite sharp at F2, so it really depends on how much DOF you need.
 

Max

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May 18, 2014
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Thank you for these good advices. I've actually done some tests yesterday with a tripod taking a picture of a small text and noticed that around 3 or 4 the text was sharper.

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LowriderS10

Monkey with a camera.
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May 19, 2013
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Canada
I shoot most of my M4/3 lenses at f4 (or as close as possible)...seems to be the spot where they sharpen up as much as they ever will, without diffraction rearing its ugly head.
 

GFFPhoto

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Feb 24, 2013
Messages
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I shoot most of my M4/3 lenses at f4 (or as close as possible)...seems to be the spot where they sharpen up as much as they ever will, without diffraction rearing its ugly head.
I think we don't get diffraction until around f8, but you are correct that in general they start to soften after around f4
 
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