Should I go RAW only?

Started 8 months ago | Discussions thread
richardplondon
Veteran MemberPosts: 8,384Gear list
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Re: I did not know that!
In reply to canonagain123, 8 months ago

First, it's worth checking what is already available online: Adobe Lens Profile downloader

Otherwise, the printable targets are included with the tool:

Adobe Lens Profile creator (Windows)  (Macintosh)

There are quite full instructions included, the only things I would say are that firstly, the selection of the right target to use (they have to be printed at a certain physical size) is a little tricky to work out in terms of focusing distance and field of view. Secondly, you really do have to follow it step by step. Thirdly, attention to getting even, shadowless lighting onto the targets pays off.

In summary, you capture a set of overlapping differently framed / positioned images for a given combination of focal length and aperture, for a given lens. You do this as many or as few times as you wish - varying aperture, focal length - and for absolute rigour, at more than one focus distance, though that is IMO a step beyond what an end user will sensibly contemplate. Differnt targets may be physically feasible in each case.

Whatever sets will more or less suitably characterise the lens for your purposes. In the Adobe online resource, profiles are rated according to how detailed or minimal the profiling has been. If it's a lens that you seldom use except in a very narrow range of apertures, you can get away with profiling just once for that, and of course for a prime lens there is much less to do, than with a zoom.

Then you feed the pictures resulting from those sets of captures, into the software, for each group stating the particular target used (you can have used different targets to suit each set, e.g. due to varying zoom). It analyses all of this, draws / extrapolates some inferences from that, and spits out a lens profile which expresses those inferences as standardised correction data.

RP

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