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I tend to leave a lot up to the camera when I take photos, so I'm curious about some results I'm seeing:

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* The left photo is with a TL2 using a Voigtländer 28mm/f2 lens... exposure compensation is at -2/3 but everything else was at auto...

* The right photo is with a Panasonic GF1 using a Panasonic Summilux 25mm/f1.4 lens... exposure compensation is at -2/3 but everything else was at auto...

I've read that the TL2 doesn't have an "anti-aliasing filter". Is that what makes the transition from colored light to white have so much contrast (too high, to my eyes and with a lot of very saturated stray pixels) or is it just me who don't know how to use Affinity Photo properly (which I switched to quite recently because I don't want to rent my software).

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It is not very useful to compare a 13 MP MFT sensor to a 24 MP APSC sensor twice the size. 
On the righthand image you see twice the noise, twice the pixelation and twice the colour aliasing on the contrast transitions - which depends on the raw engine if your postprocessing software as well (or in-camera jpg conversion algorithms) This is caused by the fact that the image has to be enlarged twice.
The presence of an AA filter is not very relevant. That is meant to reduce Moiré effects on fine structures by introducing blur -although it may affect colour aliasing as well. 
On top of that LEDs emit discontinuous light, which means that the two images are most likely exposed differently.
In short: Melons to cherries rather than apples to oranges.

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I find it weird that a -2/3 exposure compensation would ever yield blown highlights (it never did on the old camera).

However, by chance I did a zoom on the jpg vs the raw:

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So, I guess it's me who don't know how to properly use Affinity Photo?

Or is it the software that's confused by the lack of lens info?

 

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