Lens Detection - SIGMA 18-250mm F3.5-6,3 DC Makro OS HSM

Question

Hi Guys
I recently purchased the lens mentioned above as a universal and travel lens.
I did some shots to day and imported them into LR4.
By Default I always do lens correction when importing but LR4 detects this lens as "18-150" only, no make, no model.
I first thought: "damned, again this problem, I had it with that stupid Tamron lens" .... but the I did an import with the same raw (CR2) pictures in Apple Aperture and I get the correct lens data here:
Am I doing something wrong?
Thanks for your help.
andre

Answer 1

Was some kind of a preset (called "Lens Correction") applied at the tiime of import? That is what the first line in the History suggests to me.
However, just because it was called that, does not mean that it has succeeded in correcting the image. Perhaps it was intended to turn on profiled corrections but did not, or perhaps those were turned off subsequently somehow (paste settings, sync, auto-sync, another preset, something of those kinds).
If you want to see the outcome of using that preset at that time. (as opposed to, what happened to the image subsequently) then you can click on that topmost stage in the image History, and see what the various image settings then show. (Important: don't actually adjust anything at all until you have clicked back "forward" again to the lowest entry in the History, or else you will lose all these subsequent History steps.)
When lens profile correction is turned on (either by your LR defaults, as customised by the user, or else by a preset, or else manually) then in order for this profile to be applied to the image, firstly the lens used has to be recognised and associated with a particular profile. 
Even if no usable profile is found, though, for a given image - whether manually selected Custom, Auto, or Default (which also pays attention to the user's customised assignments) - the state of this Enable checkbox should persist anyway, AFAIK.
If that was formerly on and then turned off, this will be evident somewhere in the image's full History - provided that survives.
I suppose that if the earliest History of your image pre-dates the introduction of the profiled lens corrections feature, the "Lens Correction" reference may relate to pure manual lens corrections. I used, long ago, to run a series of presets each directly applying barrel, vignetting and CA adjustments which I had "eyeballed" and then saved against one of my lenses. With later versions of LR, it is enough to turn on profiled correction generally, then each image will get whatever is the needed profile applied.
So I now need only one import preset to do that, instead of several antique lens-specific ones (I find it better to do it this way, than through LR processing defaults). But that antique metadata wqould not provide for the enabling of any profile - since such things were not yet heard of at the time - and profiles are not automatically turned on when you bring images up to a newer process version. You would have to actively make that happen - cancelling those earlier manual corrections.
hth - RP