Sorry, it became apparent at some point that the first version of this profile
I mailed was overcorrecting under some circumstances (I may have had the focus
set past infinity for the "infinity" shots). The attached version seems to
behave better throughout the focus range. The vignetting on this lens changes
substantially between its close focus point and infinity, so a single-distance
profile such as in the current database is only going to be right about as
often as the proverbial stopped clock. ;)
On Thu, Mar 31, 2016, at 19:39, junkyardspar...@yepmail.net wrote:
> I wasn't getting good results with the existing lensfun profile for this lens
> at anything other than close focus distances. I generated a profile using
> shots at infinity and minumum, and it works much better for me. These are the
> numbers for anyone who wants to try them out (and maybe confirm that it's not
> just my lens that's wonky)...
> [...]
> Also attached as the full profile I'm using in case the formatting gets
> mangled.
>
> Cheers,
> junkyardsparkle
> Email had 1 attachment:
> + Oly_25mm.xml
> 2k (text/xml)
<lensdatabase>
<lens>
<maker>Olympus</maker>
<model>OLYMPUS M.25mm F1.8</model>
<mount>Micro 4/3 System</mount>
<cropfactor>2.0</cropfactor>
<aspect-ratio>4:3</aspect-ratio>
<calibration>
<distortion model="ptlens" focal="25" a="0.00454" b="-0.0141" c="0.00283" />
<vignetting model="pa" focal="25" aperture="1.8" distance="0.25" k1="-0.6903" k2="0.5378" k3="-0.2296" />
<vignetting model="pa" focal="25" aperture="1.8" distance="3.675" k1="-0.9318" k2="0.5595" k3="-0.1813" />
<vignetting model="pa" focal="25" aperture="1.8" distance="1000" k1="-0.9277" k2="0.5280" k3="-0.1581" />
<vignetting model="pa" focal="25" aperture="2" distance="0.25" k1="-0.2611" k2="-0.2502" k3="0.1928" />
<vignetting model="pa" focal="25" aperture="2" distance="3.675" k1="-0.4885" k2="-0.3012" k3="0.2847" />
<vignetting model="pa" focal="25" aperture="2" distance="1000" k1="-0.4815" k2="-0.3312" k3="0.3023" />
<vignetting model="pa" focal="25" aperture="2.2" distance="0.25" k1="-0.1095" k2="-0.2784" k3="0.1222" />
<vignetting model="pa" focal="25" aperture="2.2" distance="3.675" k1="-0.1527" k2="-0.8429" k3="0.5227" />
<vignetting model="pa" focal="25" aperture="2.2" distance="1000" k1="-0.1505" k2="-0.8676" k3="0.5399" />
<vignetting model="pa" focal="25" aperture="2.5" distance="0.25" k1="-0.2047" k2="0.0987" k3="-0.1083" />
<vignetting model="pa" focal="25" aperture="2.5" distance="3.675" k1="-0.0485" k2="-0.7477" k3="0.3542" />
<vignetting model="pa" focal="25" aperture="2.5" distance="1000" k1="-0.0403" k2="-0.7939" k3="0.3860" />
<vignetting model="pa" focal="25" aperture="2.8" distance="0.25" k1="-0.1892" k2="0.0178" k3="-0.0135" />
<vignetting model="pa" focal="25" aperture="2.8" distance="3.675" k1="-0.1069" k2="-0.3737" k3="0.0628" />
<vignetting model="pa" focal="25" aperture="2.8" distance="1000" k1="-0.0911" k2="-0.4310" k3="0.0954" />
<vignetting model="pa" focal="25" aperture="3.2" distance="0.25" k1="-0.1837" k2="-0.0097" k3="0.0155" />
<vignetting model="pa" focal="25" aperture="3.2" distance="3.675" k1="-0.2257" k2="0.0951" k3="-0.2530" />
<vignetting model="pa" focal="25" aperture="3.2" distance="1000" k1="-0.2103" k2="0.0478" k3="-0.2314" />
<vignetting model="pa" focal="25" aperture="3.5" distance="0.25" k1="-0.1864" k2="-0.0014" k3="0.0095" />
<vignetting model="pa" focal="25" aperture="3.5" distance="3.675" k1="-0.2867" k2="0.2934" k3="-0.3649" />
<vignetting model="pa" focal="25" aperture="3.5" distance="1000" k1="-0.2704" k2="0.2533" k3="-0.3480" />
<vignetting model="pa" focal="25" aperture="4" distance="0.25" k1="-0.1883" k2="0.0064" k3="0.0040" />
<vignetting model="pa" focal="25" aperture="4" distance="3.675" k1="-0.3230" k2="0.3698" k3="-0.3610" />
<vignetting model="pa" focal="25" aperture="4" distance="1000" k1="-0.3178" k2="0.3722" k3="-0.3780" />
<vignetting model="pa" focal="25" aperture="4.5" distance="0.25" k1="-0.1903" k2="0.0091" k3="0.0031" />
<vignetting model="pa" focal="25" aperture="4.5" distance="3.675" k1="-0.3143" k2="0.2979" k3="-0.2642" />
<vignetting model="pa" focal="25" aperture="4.5" distance="1000" k1="-0.3147" k2="0.3219" k3="-0.2971" />
<vignetting model="pa" focal="25" aperture="5" distance="0.25" k1="-0.1999" k2="0.0316" k3="-0.0100" />
<vignetting model="pa" focal="25" aperture="5" distance="3.675" k1="-0.2860" k2="0.1647" k3="-0.1305" />
<vignetting model="pa" focal="25" aperture="5" distance="1000" k1="-0.2837" k2="0.1839" k3="-0.1577" />
<vignetting model="pa" focal="25" aperture="7.1" distance="0.25" k1="-0.2146" k2="0.0616" k3="-0.0284" />
<vignetting model="pa" focal="25" aperture="7.1" distance="3.675" k1="-0.2628" k2="0.0491" k3="-0.0215" />
<vignetting model="pa" focal="25" aperture="7.1" distance="1000" k1="-0.2608" k2="0.0681" k3="-0.0419" />
<vignetting model="pa" focal="25" aperture="22" distance="0.25" k1="-0.2739" k2="0.1756" k3="-0.0983" />
<vignetting model="pa" focal="25" aperture="22" distance="3.675" k1="-0.2533" k2="0.0122" k3="-0.0029" />
<vignetting model="pa" focal="25" aperture="22" distance="1000" k1="-0.3094" k2="0.1649" k3="-0.1039" />
</calibration>
</lens>
</lensdatabase>
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