Profiles to be used by what app?
Chuck Norcutt
On 8/30/2016 12:07 PM, Ken Norton wrote:
The OM-6D brings special challenges that I haven't had to deal with
before. Essentially, the 28/2 is next to worthless on it because of
the excessive vignetting as well as distortion. Character traits that
are not present on film, but definitely present on the full-frame
sensor. So a bit if research kicked in and I went down the dark alley
of creating a custom lens profile using Adobe's tool.
Without turning this into a TL:DR post, I'll just summarize by saying
that, yes, it works, and it was worth the five minutes to do it. Well,
it took me five hours to learn the tool and figure out why the profile
wasn't appearing. Five minutes to actually create the profile.
That five minutes was for a quick-and-dirty profile with a single
sheet of 8.5x11 sheet of paper with the squares printed on it, lit by
some aweful CF lights. I will redo it with a better quality and larger
print and with controlled lighting. I'll also do it with far more
samples, multiple apertures, and so forth. But my five-minute POS
profile did miracles.
I also created profiles for the 35-80 at 35, 50 and 80mm. Those are
pretty rough, but at least it addresses the distortion at 35mm which
makes it possible for me to do pano-merges now.
I downloaded profiles for the E-lenses (14-42 and 14-54) and have
started using those a little bit on some conversions I'm doing for
stock. it helps, but in the case of the E-1 photos, there really isn't
enough pixels to go around for correction. It's better to leave those
as-is whenever possible.
As you long-term Canon users are aware of, the sensel wells in the
Canon sensors are mighty deep and the vignetting from the microlenses
more of an issue than what should be. I looked at the profiles for
many Canon EOS lenses and found that the amount of correction needed
for my 28/2 pales in comparison to many of the EOS lenses which border
on the absurd.
AG (defringed) Schnozz
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