Thanks Moose. Do you actually have a day job, or does someone pay you to
be so helpful and thorough here on the list? ;-)
I looked at PTLens but I am reluctant to get involved with another piece
of software. It is not the money, obviously, but I just like my workflow
simple, and so I do everything in Lightroom. I think that Lightroom has
some lens calibration tools, will have to check them out.
Cheers,
Nathan
Moose wrote:
> Nathan Wajsman wrote:
>
>> Having reviewed the first couple of hundred images taken with the E410
>> and its 14-42mm kit lens, I have more or less concluded that I would
>> like a better standard zoom than the 14-42. Specifically, I am a bit
>> annoyed by the slowness of this lens, and by the quite visible barrel
>> distortion at the 14mm end.
>>
>>
> Nothing much to be done about the speed except higher isos or bigger,
> heavier (and more $) lenses which sort of defeats your light kit intent.
>
> There is a pretty good, and very inexpensive, solution to the
> distortion, though. PTLens, $15, has parameters for all the common ZD
> lenses in its database and provides very easy correction.
> http://epaperpress.com/ptlens/index.html
>
> BTW, the distortion is not simple barrel, but a more complex kind common
> in very short focal length lenses. It appears that, although 14mm on a
> 4/3 camera has a FOV similar to 28mm on FF, it has distortion
> characteristics more like a super wide lens for FF than a 28mm.
>
> Nice discussion of complex distortion here.
> http://epaperpress.com/ptlens/index.html
>
> Unfortunately, you strip out the EXIF info from your posted images in
> this gallery, so one can't know which were taken at which focal lengths.
> I just took a few with what appeared to be WA views and/or have
> distortion and applied correction for the 14-42 @ 14 mm. It would appear
> that seeveral were indeed taken at or near 14 mm. 105, 206 & 275, though
> are mis/overcorrected, leading me to believe they were taken at longer
> focal lengths and 254 is just hard to tell. The rest seem to me to be
> very nicely corrected.
> http://www.moosemystic.net/Gallery/Others/Wajsman/PTLens/
>
> Given correct focal lengths, I'd expect the ones that are over done to
> come out right, too.
>
>> I have looked on dpreview and Miranda for Olympus lens reviews but
>> cannot find any.
>>
> For some tests of ZDs that address discuss linear distortion,
> http://www.photozone.de/8Reviews/index.html
>
> Interestingly enough, you may get an idea of the distortion of most
> lenses using PTLens in reverse. Create a crossed lines pattern in any
> image editor, look at it in PTLens and see how the square pattern is
> distorted by different lenses and focal lengths. To compare different
> lenses, I apply the filter version of PTLens in PS and save the
> alternative lenses as different layers, so I can switch between them.
>
> Moose
>
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--
Nathan Wajsman
Almere, The Netherlands
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