I am using a Samyang 7.5mm f/3.5 UMC Fisheye MFT lens to shoot panoramas. I know that the lens correction parameters are in the Lensfun database that ON1 uses in RAW. HOWEVER, the lens is completely manual (though modern) and has no electronic communication with the camera. This means that there is no information in the EXIF to tell RAW what lens correction to use.
The easiest way to fix this would be if ON1 allowed us to set the "Make" and "Lens" in the Lens Profile area when it is a manual lens. In what is really a puzzling design choice, IF there is EXIF data in a file, as with most electronically connected lenses, then you are completely free to use some pull-downs to set the "Make" and "Lens" (thought why you would want to, since it is already set to the correct lens, I have no idea.) In fact, I can change one of my Olympus lens's images to have the "Make" and "Lens" for my Samyang 7.5mm lens AND I can see it do corrections. However, if there is no EXIF for the lens in the file, those pull-downs DO NOT appear, so you CAN NOT set the "Make" and "Lens" when you actually need to do so! So, unless ON1 decides to change this behavior to be more sensible, this easy fix is not going to happen. I see multiple cases of people asking for this in the forums, but no response from ON1 is to be found.
The harder way to fix this is to edit the EXIF information to put in my lens information. I have tried several programs that claim to be able to do this, with varying degrees of success. Some fail completely to write information and give errors, others act like they work, but don't. Only one I have found (MetaImage) manages to actually put some information into the file, though it is not entirely clear which fields I need to set to make ON1 RAW successfully load the corrections. I have tried various combinations and found that I can get ON1 RAW to reflect information in the Lens Correction module under "Lens Info", "Make", and "Lens", but is does NOT actually load any corrections (no change in the image when I turn corrections on and off again.) Also, although it shows what appears to be the correct "Make" and "Lens", there are no pull-downs like there are with my Olympus lenses.
I even tried to get clever and change the exif data to make ON1 think it was one of my Olympus lenses so that I could then get the pull-downs to change it to the correct "Make" and "Lens" and get the corrections, but I can't seem to fake that properly, even though I change what seem to be the correct EXIF fields.
Does anyone have a solution to this? Does anyone at ON1 look at these posts and have a response as to whether you might consider letting us set the "Make" and "Lens" when there is no lens EXIF, instead of disabling the needed pull-downs?
Can anyone help me with exactly what fields are needed to get ON1 RAW to choose the parameters it already has waiting in its Lensfun database? Note: I am using a Mac and could use some suggestions for EXIF editors (with a GUI!) that will allow me to set the necessary fields using a Mac. Programs I have not been able to make work properly are NameThatLens and setexifdata.
Thanks in advance for any suggestions.
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