From David's examples it is clear that not getting the correct maximum aperture correctly entered has a measurable effect on the exposure accuracy - especially when the entered maximum aperture is off by ~ +/- 2 stops.
Apart from achieving EXIF data accuracy, how profound is the error introduced (maybe ~10%) by not always being able to always input the correct focal length - especially where spot and centre weighted metering patterns are involved?
Automatic EXIF data accuracy is just a dream, if you don't edit manually the EXIFS you will have a horrible 0mm f/0 in the lens description, the documented focal length will obviously be the nearest available one you entered, and more parameters will be off. Here's a sample EXIF from a photo taken this morning with the Nikkor-O 2.1cm/4 on the Zfc (in red are marked additions and corrections to the EXIF):
[EXIF] ImageDescription: Immagini di prova con Nikon Zfc, adattatore AI-N/Z e tubo prolunga Z Meike 11mm[EXIF] Make: NIKON CORPORATION
[EXIF] Model: NIKON Z fc
[EXIF] LensModel: 2.1cm f/4 Nikkor-O[EXIF] ExposureTime: 1/50
[EXIF] FNumber: 4.0[EXIF] ExposureCompensation: +2/3
[EXIF] ISO: 400
[EXIF] FocalLength: 21.0 mm
[EXIF] FocalLengthIn35mmFormat: 32 mm[EXIF] ExposureMode: Auto
[MakerNotes] WhiteBalance: Auto0
[MakerNotes] Quality: Normal
[MakerNotes] FocusMode: Manual
[MakerNotes] AFAreaMode: Single
[EXIF] Flash: No Flash
[MakerNotes] VibrationReduction: Off
[MakerNotes] ActiveD-Lighting: Off
[EXIF] Orientation: Horizontal (normal)
[MakerNotes] HDR: Off
[EXIF] DateTimeOriginal: 2022:02:23 09:56:58
[EXIF] CreateDate: 2022:02:23 09:56:58
[MakerNotes] TimeZone: +01:00
[MakerNotes] DaylightSavings: No
[EXIF] Artist: Massimo Bianco
[EXIF] Copyright: ©2022 Massimo Bianco
[EXIF] UserComment: ©2022 Massimo Bianco
[EXIF] Software: Ver.01.20
[MakerNotes] ShutterCount: 440
[MakerNotes] MechanicalShutterCount: 440
[XMP] Subject: (Meike Tube 11 mm) , (AI_N/Z adapter)[MakerNotes] SerialNumber: 6013963
[EXIF] LensMake: NIKON
[MakerNotes] Lens: 21mm f/4
[EXIF] LensSerialNumber: 226374[MakerNotes] DirectoryNumber: 100
[MakerNotes] FileNumber: 0427
[EXIF] ExifImageWidth: 5568
[EXIF] ExifImageHeight: 3712
There are a few things that could be fixed in EXIF automatically by Nikon:
-They could have image width and height in the NEF's EXIF (Absent, instead present in JPG's EXIF)
-They could store image width and height according to orientation (if it's a portrait mode they could exchange the width with the height)
-Tey could report correctly the parameters inserted for the Non-CPU lens data entered instead of 0mm f/0
0mm f/0 should be displayed only if user has selected an empty entry among the 20 possible options!
Knowing Nikon's reputation for perfectionism, I don't understand why they haven't got it right in the 18 years (2004-2022) that these errors are present and documented throughout Nikon's lineup...
Ciao from Massimo