Non-CPU lenses: EXIF data on lens name?

[kuryan_thomas]

<p>Several Nikon DSLRs can maintain an in-camera mini database of non-CPU lenses such as the Zeiss ZFs. While the database can store focal length and maximum aperture, there doesn't seem to be a way to store a lens name.</p>

<p>Is that correct?</p>

<p>If so, what shows up in the lens name field of a cataloging application such as Lightroom?</p>

<p>Thank you.</p>

[frank_skomial]

<p>Focal length is for lens identification, so the lens name is not needed to allow proper metering. If there is no lens name, EXIF does not know that, and no need to expect anything meaningful from Lightroom or any other software. </p>

<p>Question what to enter for focal length if a zomm lens is used pops up frequently - the answer would be: it does not matter.</p>

<p>I do not want to generalize about all Nikon DSLR, but seems that most Nikon DSLR cameras that have enabled the non-CPU lenses provision for metering also happen to have mechanical aperture indexing lever (AI)</p>

<p>It was argued before that even cameras (e.g. D70) without mechanical AI could benefit from having non-CPU metering enabled, but of course it makes more sense for cameras with AI.</p>

<p>Non-CPU lens cannot provide actual aperture value of the lens to the camera since has no electric contacts. If a non-CPU lens is also a non-AI lens then the aperture that must be entered is not the "maximum aperture" as you stated, but the actual aperture set on the lens via the aperture ring. </p>

<p>For preset lenses with T-Mounts it is inconvenient to change the non-CPU aperture value in the camera menu for each change of the aperture ring on the lens, but it works OK for those who understand the idea of preset metering with non-CPU data entry for aperture.</p>

 

[wpahnelas]

<p>don't know about lightroom, but captureNX does not identify the lens besides focal length, as my screen capture shows. the image was made with a 35/2 AI.</p><div></div>

[pete_s.]

<p>Best way to check <strong>all</strong> the exif info is with exiftool. It can extract exif both from raw and jpeg and also change exif on files if needed. I don't think the camera puts any info about which lens was used simply because it doesn't know.</p>