Which aspect ratio renders 12mm as 24mm?

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Donald M Mackinnon Senior Member • Posts: 1,597
Which aspect ratio renders 12mm as 24mm?

I shoot jpeg mostly and use Picasa for pp. When I have the 12-32mm lens mounted on any mft body and choose the 16.9 aspect ratio Picasa records the focal length as 12mm and the 35mm equivalent as 26mm not 24mm.

Until recently I stupidly thought this was simply an error in Picasa. However I discovered that this is not the case when I compared shots from a GX80 /12-32mm with an LX7.

Set to 16.9 Picasa not only shows the LX7 35mm equivalent length to be 24mm but when compared with the GX80/12-32 combo at 26mm the missing 2mm is very obvious.

So my question is which aspect ratio renders 12mm as  24mm ?

Hoping this makes sense, example below shows the extra 2mm in the second image taken with the LX7.

Panasonic Lumix DMC-GX85 Panasonic Lumix DMC-LX7
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