Re: [OM] Olympus 12mm is not 12mm?

[C.H.Ling]

The out of camera JPEG is exactly the same as Olympus Viewer converted 
image, it looks the same as seen on LCD liveview too. I just don't 
understand why RawTherapee can gives wider view (also linear distortion 
corrected) and Olympus just cut it out.
C.H.Ling

----- Original Message ----- 
From: "Wayne Harridge" <wayne.harridge@xxxxxxxxxxxxxxxxxxx>
To: "'Olympus Camera Discussion'" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Saturday, June 20, 2015 3:20 PM
Subject: Re: [OM] Olympus 12mm is not 12mm?


> That's really interesting, I guess the correction for linear distortion
> followed by the necessary crop explains it.
>
> What is the difference between the out of camera JPG and the converted
> images ?
>
> Is the angle of view different on the screen prior to shooting compared 
> with
> viewing the shot image ?
> I presume the lens corrections wouldn't been done at the liveview stage.
>
> ...Wayne
>
>
>
> -----Original Message-----
> From: olympus
> [mailto:olympus-bounces+wayne.harridge=structuregraphs.com@xxxxxxxxxxxxxxxxx
> ] On Behalf Of C.H.Ling
> Sent: Saturday, 20 June 2015 4:45 PM
> To: Olympus Camera Discussion
> Subject: [OM] Olympus 12mm is not 12mm?
>
> Just found an interesting issue with the lens angle of view on the newer 
> vs
> older M4/3 bodies and also Viewer 3 vs RawTherapee.
>
> Following two images are RAW converted on Viewer 3
>
> EP-5 with 12-40mm at 12mm:
>
> http://www.accura.com.hk/temp/P6172303-OV3.jpg
>
> E-PL1 with the same lens at 12mm on a different day:
>
> http://www.accura.com.hk/temp/P6200387-OV3.jpg
>
> You can see the shot from E-PL1 cover a wider angle.
>
> Following two images are same as above but converted with RawTherapee.
>
> E-P5:
>
> http://www.accura.com.hk/temp/P6172303-RT.jpg
>
> E-PL1:
>
> http://www.accura.com.hk/temp/P6200387-RT.jpg
>
> The angle of view is further widened on both images.
>
> As many of you know I prefer Olympus RAW converter but since E-P5 I found
> the image edges are very chunky, looks over sharpened with USM at high
> radius (say 1.5-2 pixels) even I set the sharpen to minimum. This forced 
> me
> to look for other RAW converters. widened
>
> Further checking the images after this discovery, I believe Olympus has 
> made
> the following process to its image on both JPEG and its RAW engine:
>
> - linear distortion correction
> - chroma and fringe adjustment
> - crop the image heavy
> - Resize the image to fit the pixel size, in that case enlarge the image 
> to
> fit 4608x3456 on the E-P5
>
> The last process creates a big issue on the natural look of the image, 
> which
> looks realy bad for pixel peeping. Now I understand why the images taken
> with my OM Zuikos looked much better than the 4/3 native lenses as no
> correction/cropping is done with the non native lenses.
>
> Comparing the angle of view of my old 11-22 at 11mm and the 12-24 at 12mm, 
> I
> believe the 12mm is much narrower than quoted on a E-P5 with Olympus 
> Viewer.
> As you know even half a millimeter counted at wide angle, it is too bad to
> see the result like that.
>
> C.H.Ling
>
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