Feature Request - New Lens
|Status:||Closed||Start date:||03 Feb 2016|
|Assignee:||Robin Mills||% Done:|
|Category:||lens||Estimated time:||1.00 hour|
Hi. Could you add this lens? It's a Sony SEL35F18
Exif.Sony2.LensID Long 1 Manual lens
Exif.Photo.LensSpecification Rational 4 350/10 350/10 18/10 18/10
Exif.Photo.LensModel Ascii 16 E 35mm F1.8 OSS
#1 Updated by Robin Mills over 1 year ago
- Status changed from New to Closed
- Assignee set to Robin Mills
- Target version set to 0.26
- % Done changed from 0 to 100
- Estimated time set to 1.00
Your lens cannot be identified. It is using the LensID of -1 which is shared by many lenses. I'm not sure why the manufacturer uses LensID of -1. I suspect it is because the lens is unknown to the camera firmware. A camera firmware upgrade may help.
$ exiv2 -pv -g lens/i ~/Downloads/DSC01220.jpg 2>/dev/null 0xb027 Sony2 LensID Long 1 65535 $We have an (optional) new feature in development for v0.26 #1034 which will use exiftool over a webservice which produces the following output.
$ exiftool ~/Downloads/DSC01220.jpg | grep Lens Lens Type : E-Mount, T-Mount, Other Lens or no lens Lens Spec : Unknown (00 0 0 0.3 0 3f) Lens Mount 2 : Unknown (192) Lens Type 3 : Unknown (49344) Lens E-mount Version : c0.c0 Lens Firmware Version : Ver.c0 Lens Format : Unknown (64) Lens Mount : Unknown (192) Lens ID : Sony E 35mm F1.8 OSS $So with version v0.26, your lens will be recognised as 'Sony E 35mm F1.8 OSS'. exiftool is able to perform this recognition using a "heuristic" (a guess). The "heuristic" works by inspecting other metadata in the image such as FocalLength and Aperture to guess the Lens.
$ exiv2 -pv -g lens/i -g focal/i -g aper/i ~/Downloads/DSC01220.jpg 2>/dev/null 0x9205 Photo MaxApertureValue Rational 1 434/256 0x920a Photo FocalLength Rational 1 350/10 0xb027 Sony2 LensID Long 1 65535 0xa405 Photo FocalLengthIn35mmFilm Short 1 52 $ exiv2 -pa -g lens/i -g focal/i -g aper/i ~/Downloads/DSC01220.jpg 2>/dev/null Exif.Photo.MaxApertureValue Rational 1 F1.8 Exif.Photo.FocalLength Rational 1 35.0 mm Exif.Sony2.LensID Long 1 Manual lens Exif.Photo.FocalLengthIn35mmFilm Short 1 52.0 mm $Our wonderful makernote engineer, Niels has gone back to college in addition to his very demanding day job. I have taken over our makernote support in additional to many other roles. Having fixed about 20 lenses, I've reached the conclusion that Exiv2 is not going to replicate all the code in exiftool for this "heuristic". The aim of Exiv2 is to reliably read/write metadata in the image. Lens recognition based on a "heuristic" is non-determistic and therefore can never be reliable. The web service to call exiftool will be used in future when the LensID = -1 (or any of the many other duplicated LensIDs).