Indeed, this was done by design. The idea is that the metadata should
match the image content. If you stitch two 28mm photos, the resulting
image has a wider field of view and should no longer have 28mm in the
Since PTGui itself relies on the metadata being correct when stitching
images, it would just be wrong to add incorrect metadata. The camera
model is used to find out the sensor size. With a stitched image this is
no longer correct, so PTGui adds the brackets to indicate that it is no
longer truly an OM-1 image.
I know there are other ways to look at this, and I've learned that
metadata is a sensitive subject for some. Perhaps adding the original
metadata to a comment field would be useful, but then the question
becomes where to stop. If you need a true audit trail for your panoramic
image, the only true solution is to keep the original images and the
project file anyway.
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