After a long hiatus from my photography hobby and RT I recently rebooted both interests and installed RT 5.11. My gear consists of an Olympus E-M1 Mark II and several older Zuiko Digital (ZD) lenses which I fit with the Olympus MMF-3 adapter.
If anyone else here shoots with a similar combination of gear I’d be interested in hearing if your experience mirrors or differs from what I see from the Profiled Lens Corrections settings in the Transform tab.
Firstly, if I select the ‘Automatically selected’ option the ‘E-M1MkII’ profile is activated for the camera; but, the lens profile is not populated. This is despite all my ZD lenses being in the lensfun database for some years now. Any idea why these lenses are not automatically detected from the metadata?
Secondly, if I select the ‘Manually selected’ option for the lens, and select the matching profile from those on offer, that profile does populate the lens profile box. However; a warning icon (‘exclamation point inside triangle’') also appears next to the lens profile box which, when I hover over it, states: “Warning: the crop factor used for lens profiling is larger than the crop factor of the camera. The results might be wrong.” I don’t recall seeing this warning before now. Is there some way to determine what crop factor was used to create the profile? I’d ignore the warning but for the fact the three possible corrections that come with these profiles are now disabled (grayed out). What’s your experience?
Appreciate the response, @HIRAM . In my case the crop factor of the camera and that of the older Four Thirds lenses likely used to profile the ZD lenses are ‘identical’, nominally 2x. That’s one source of my bafflement. More importantly, selecting the lens manually, as I said, disables any corrections that the profile might have offered.
I’m sure this worked in the (distant?) past; but, hopefully some Olympus / OM System users can shed further light on all this. Fingers crossed.
If the lensfun files included with RT 5.11 show the camera and the lens having exactly the same crop factor in the relevant XML files (slr-olympus.xml for the lens and mil-olympus.xml for the camera), what checks does the code run that might trigger the warning message I see when selecting the lens profile manually?
Hopefully, someone has the time to help me track down the problem. Since my original post, I’ve come across one other ZD lens in my collection that triggers the same response. Other ZD lenses I own, defined with same crop factor in the same XML files, do NOT throw the error when their lens profiles are selected.