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[OM] Re: Olympus 11-22mm / f2.8-3.5 digital zoom

Subject: [OM] Re: Olympus 11-22mm / f2.8-3.5 digital zoom
From: "Geilfuss Charles" <Charles.Geilfuss@xxxxxxxxxxxxxxxxx>
Date: Fri, 22 Sep 2006 10:01:15 -0500
John,
        Very nice photo. Your eyes must be sharper than mine; I see no
barrel/pincushion distortion just a slightly tilted horizon line (also
easily corrected in PS).

Charlie

-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On
Behalf Of John Hudson
Sent: Friday, September 22, 2006 10:21 AM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Olympus 11-22mm / f2.8-3.5 digital zoom


Chuck:

Thanks. I will see what I can do.

It is nevertheless unfortunate that a seemingly good quality lens has
such a severe defect and that reliance has to be placed on outside
fixes.

Although the barrel distortion is most evident on the horizon I have to
assume that this optical distortion is present across the entire image.
If this is the case and if one was to enlarge just a small portion of
the digital image the barrel distortion would / could be noticeably
evident on what should be straight lines..

Here
www.johnhudsonphoto.com/470.html  
there is evidence of both barrel and pin cushion distortion. This was
was taken with the 40-150mm zoom. This is a candidate for some fix it
treatment as well.

John H

----- Original Message ----- 
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Friday, 22 September, 2006 10:37 AM
Subject: [OM] Re: Olympus 11-22mm / f2.8-3.5 digital zoom


> You can start here with PanoTools and a brief tutorial on using a
subset 
> of PanoTools for barrel distortion correction.
>
<http://www.dpreview.com/learn/?/Image_Techniques/Barrel_Distortion_Corr
ection_01.htm>
> PanoTools is a freebie that provides the basic engine for panorama and

> other image manipulation software.
> 
> Or you can use PTLens <http://epaperpress.com/ptlens/index.html> which

> costs $15 but has a free trial version.  Also does vignetting, 
> perspective and chromatic abberation.  Used to be free.  Operates from
a 
> lens database.  Service includes calibration assistance for your lens
to 
> be added to the database if it's not there already.  All Oly 4/3
lenses 
> are in the database already.
> 
> Waiting to see the corrected version...
> Chuck Norcutt
> 
> 
> John Hudson wrote:
> > 
> > ----- Original Message ----- 
> > From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>
> > To: <olympus@xxxxxxxxxx>
> > Sent: Friday, 22 September, 2006 08:18 AM
> > Subject: [OM] Re: Olympus 11-22mm / f2.8-3.5 digital zoom
> > 
> > 
> > 
> >>All good stuff but I actually like your 14-45 shot best of all.  But
the
> >>barrel distortion is very noticeable on the horizon.  Should be easy
to
> >>fix though in post processing.
> > 
> > 
> > Chuck: Please point me in the direction of PS version 6 and tell me
how.
> > 
> > John H
> > 
> > 
> > 
> > 
> >>Chuck Norcutt
> >>
> >>John Hudson wrote:
> >>
> >>
> >>>Taken outdoors with the 7-14
> >>>http://www.johnhudsonphoto.com/453.html
> >>>
> >>>Taken indoors with the 7-14
> >>>http://www.johnhudsonphoto.com/486.html
> >>>http://www.johnhudsonphoto.com/487.html
> >>>
> >>>Taken with the 14-45 zoom
> >>>http://www.johnhudsonphoto.com/504.html
> >>>Notice the barrel distortion. This is one reason I am looking for a
> > 
> > better
> > 
> >>>option than the 14-45 zoom.
> >>>The 11-22 looks to be the better choice.
> >>
> >>
> >>
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2006-09-21
> >>
> >>
> > 
> > 
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> > 
> > 
> 
> 
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> 
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2006-09-21
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