But if you don't know what TCA is, can it hurt you?
And if you are unable to comprehend what appears to be higher math, will it
hurt you?
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxxxx
Sent: Tuesday, September 18, 2018 12:53:39 PM
Subject: Re: [OM] LensFun [Was: Re: (no subject)]
On 9/18/2018 10:33 AM, Jan Steinman wrote:
>> From: Michael Gordon <usher99@xxxxxxx <mailto:usher99@xxxxxxx>>
>>
>> :-) It is not clear to me what aberrations lensfun is designed to correct.
>> Can you enumerate?
> Here’s something to look at while sitting in an airport. :-)
>
> http://lensfun.sourceforge.net/calibration-tutorial/lens-tca.html
> <http://lensfun.sourceforge.net/calibration-tutorial/lens-tca.html>
>
> Cliff Notes version: LensFun corrects for “Transversal Chromatic Aberration,”
> as well as barrel/pincushion distortion and vignetting.
The question then becomes whether this correction works well for CA-like
artifacts from non-telecentric lenses on thick
sensor stacks. Understand, I don't care a whit, for my own photography, but am
pedantically asking the logical question.
As I recall, when Roger at LensRentals first looked at a Metabones, he found
that it performed poorly on the bench,
until a fat, flat glass slab was put in the optical path, to simulate the
sensor stack, and then did well. So it seems
they correct the problem?
T. C. A. Moose
--
What if the Hokey Pokey *IS* what it's all about?
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