Feature #1142

Manual lens does not get recogniced: Beroflex zoom 500mm

Added by Simon Harhues about 1 year ago. Updated about 1 year ago.

Status:ClosedStart date:22 Dec 2015
Priority:NormalDue date:
Assignee:Niels Kristian Bech Jensen% Done:

100%

Category:lensEstimated time:1.00 hour
Target version:0.26

Description

simon@vmubuntu1510:~$ exiv2 --version
exiv2 0.25 001900 (64 bit build) [...]
simon@vmubuntu1510:~$ exiv2 -pt /tmp/fotos/101_2212/_IGP9304.DNG | grep Lens
Exif.PentaxDng.LensType                      Byte        3  M-42 oder keine Linsen
Exif.PentaxDng.LensInfo                      Undefined  69  0 0 0 0 119 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
simon@vmubuntu1510:~$ exiv2 -pt /tmp/fotos/101_2212/IMGP2252.DNG | grep Lens
Exif.PentaxDng.LensType                      Byte        4  M-42 oder keine Linsen
Exif.PentaxDng.LensInfo                      Undefined 128  0 0 128 119 0 0 15 160 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Tested with two Pentax bodies. I'm not sure if it is possible to improve the recognition of manual lenses. But now it look pretty generic and not suitable for e.g. lensfun.
The lens is physically labeled as:
BEROFLEX -5°- 1:8 f=500mm ⌀67 846585

It is a fixed 500mm zoom lens, the aperture reaches from 8 to 32.
As the raw files are rather big, I've uploaded them to: https://www.dropbox.com/sh/3jxyf0free1oewb/AADbZD8kV07dGNTRNxoUxsFRa?dl=0
I grant you all rights to use them for the further development of exiv2 or other FOSS software.

History

#1 Updated by Robin Mills about 1 year ago

  • Status changed from New to Assigned
  • Assignee set to Robin Mills
  • Target version set to 0.26

Thanks, Simon. I'll investigate and update this issue report.

#2 Updated by Niels Kristian Bech Jensen about 1 year ago

It is not possible to identify manual lenses since they do not communicate with the camera body. Hence there are no lens metadata available in the file to help identification.

Best regards,
Niels Kristian Bech Jensen

#3 Updated by Robin Mills about 1 year ago

  • Status changed from Assigned to Closed
  • Assignee changed from Robin Mills to Niels Kristian Bech Jensen
  • % Done changed from 0 to 100
  • Estimated time set to 1.00

I don't know what a manual lens is. However if there is no metadata, nothing can be done.

#4 Updated by Robin Mills about 1 year ago

This comment on #1141 seems equally valid for this issue. http://dev.exiv2.org/issues/1141#note-4

#5 Updated by Simon Harhues about 1 year ago

Agreed. Thanks for looking at it!

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