Re: [Lensfun-users] FT Lens on mFT Camera via MMF-Adapter
Yes, the lens correction profile for a given lens can be used for any sensor size which is the same (as in this case) or smaller (by adjusting for crop factor) compared to the one used to generate the profile. You may need to add an "adapter" within lensfun to tell it to allow lenses with one mount to be mapped to cameras with another. See here: http://lensfun.sourceforge.net/manual/lensfun-add-adapter.html If that isn't working for you for some reason, see here: https://www.mu-43.com/threads/raw-conversion.95894/page-4#post-1124856 -- jys On Fri, Apr 27, 2018, at 04:24, UweB wrote: > Hi everybody, > > I use my older FT lenses also on my new mFT camera and I wonder if lens > correction data taken from shots of the FT camera with the FT lens will > also apply to images made with the mFT camera and the FT lens via MMF > adapter or if this combo would need different correction data. > > Thanks in advance > > Regards > Uwe Becher > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > Lensfun-users mailing list > Lensfun-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lensfun-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] new lens Laowa 7.5mm
Hi, thanks for the profile. I checked it against a batch of images from a review taken at different distances, and it seemed to slightly over-correct at the furthest end of the range, so I made a slight adjustment. The attached copy is what I plan to add to the database, unless you find that seems to not correct enough near infinity focus. It will, of course, not produce full correction at closer ranges, but I feel that it's more important for the profiles in the database to avoid over-correcting for reasonable cases. -- jys On Mon, Dec 18, 2017, at 13:10, Matthias Vaupel wrote: > Hello, > > I have prepared a new entry of the new Laowa ultra wide lens for the > lens database by means of manual distortion correction in Hugin and TCA > correction in Darktable. > > Best regards, Matthias Venus Optics Laowa 7.5mmF2.0 Micro 4/3 System 2 -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Is lensfun still ongoing?
On Mon, Jan 8, 2018, at 07:00, m...@sebastiankraft.net wrote: > For me it looks like both files are in sync and from the same date > (November 4th, 2017), so it seems that the files are properly updated > with a git hook from Torstens computer as soon as new profiles are > committed. I suppose the updating may be triggered by issues being closed, rather than just the commits themselves. I've been leaving the issues open for reviewing, I'll start closing them now as long as I'm confident enough about the results, unless I hear otherwise. My assumption is that closing the issue is also what triggers the new profile being sent to the uploader, which would be another reason for not leaving them open for months. Someone correct me if I'm wrong... -- jys -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Latest Database Files For Windows Users
On Sun, Dec 31, 2017, at 16:14, John J Bloomfield wrote: > > I'll shoot them all on FF (as I basic geometry makes me believe a FF > calibration should be able to be applied to APSC - but the opposite isn't > true) even though some are technically APSC lenses many do cover the whole > frame so are being commonly used. Yes, that's how it works. > Might not be the 100% accurate name as displayed in exif but I have; > > >- Pentax FA 77mm Ltd f1.8 >- Pentax DFA 100mm f2.8 WR >- Pentax DA 50mm f1.8 >- Pentax DA 35mm f2.4 >- Pentax FA 28-70mm f4 >- Pentax DAL 18-50mm RE WR >- Pentax DAL 50-200mm WR >- Sigma 17-50 f2.8 I think there may be a Pentax lens or two in the backlog for calibration, unfortunately when I went to take a look today the server holding the files (including your recent upload) wasn't responding; I contacted Torsten Bronger, the owner, and hopefully it will be up and running soon. > I have spotted a couple of other buildings that should do for the job too. > > 1. - Is this Asda Store > 2. - University building The second one, assuming you can reasonably loiter there without attracting negative attention, looks ideal... a grid like that is always nice, even if not strictly needed. Otherwise, the important thing is at least one good, reliably straight line of sufficient length to allow you to stay at a reasonable distance even at wide angles. This line should be placed as close as possible to the edge of the frame, and fully span it. Many uploaded pictures don't get the line as close to the edge as they should, possibly due to differences between the viewfinder and what the RAW actually captures, so this is one issue to keep in mind. The importance of having a second line at 1/3 of the frame depends on the complexity of the distortion; if it displays any divergence towards "mustache" from simple barrel distortion, then this line is used for additional correction. Since this can make finding and using a suitable target more difficult, I've been thinking about the possibility of using two images with the camera simply tilted to position the line differently in each. I think this could be made to work, if need be. Also note that it's ok to change distance for different focal lengths on a zoom to get the best lines; the shots don't need to be taken from the same position. An additional consideration with crop lenses on full-frame bodies is to ensure that the frame-edge line is visible at both ends despite any corner shading the lens may produce. For TCA correction images, it would be good if the corners are fairly sharp and retain as much contrast as possible, even at the expense of the center of the frame being slightly less sharp and/or overexposed. Hopefully that clarifies some of the criteria for good calibration shots. It's also convenient if the uploader has a github account and can communicate directly within the numbered "issues" that each upload generates there, in the event that communication is needed. Oh, and for zooms, the ideal focal lengths (besides both ends of the range) are the point where distortion changes from barrel to pincushion (where applicable), and a few on either side of this, weighted towards the wider end. Often, once the distortion changes to pincushion, it doesn't change drastically over the rest of the range. I hope to have some time for working on profiles this week, knock on wood! -- jys -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Latest Database Files For Windows Users
The files in that tarball seem to have been last updated almost two months ago; I don't know what determines the schedule for that. The bleeding edge database is available at the git repository: https://github.com/lensfun/lensfun/tree/master/data/db but there are a couple of caveats. The files are in "version 2" format, which needs to be backported for versions of lensfun < 0.3 due to restructuring. You would need to determine what version of lensfun your software is using. The repository is also subject to possible errors and subsequent corrections, so any use of it should probably include watching the repository for commits. -- jys On Thu, Dec 28, 2017, at 06:22, John J Bloomfield wrote: > Hi > > I use several windows programs that use the lensfun database and it is a > simple job to manually update them. > > I did it a couple of months ago using the folder located at > http://wilson.bronger.org/lensfun-db/version_1.tar.bz2 as mentioned in one > of the project mailing list archives > > But I am now wondering is that folder/file being updated or was it just an > idea that isn't being maintained? If it is being maintained perhaps it > would be a good idea to make the link more obviously available? If it is > not being maintained then how does one obtain the most up to date database > files for the purposes of updateing a windows program? > > Many Thanks for all your hard work. > > John > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > Lensfun-users mailing list > Lensfun-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lensfun-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] database updates
AFAIK, using the current git db should be fine for 0.3.2, but probably not earlier versions without some modification. On Mon, Dec 11, 2017, at 11:02, Mike Rambo wrote: > Hello, > > I am a packager for the Mageia distribution. We are packaging lensfun > version 0.3.2 but our lens database is quite outdated. I would like to > know if it is workable to just copy the /data/db directory from a new > snapshot into our package or is something more needed to make lensfun > work correctly? > > Thanks. > > > -- > Mike Rambo > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > Lensfun-users mailing list > Lensfun-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lensfun-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Own file for lensfun-correction
On Sat, Dec 9, 2017, at 02:31, Аl Воgnеr wrote: > Am Fri, 08 Dec 2017 17:25:31 -0800 > schrieb junkyardspar...@yepmail.net: > > > One other thing you might want to check is that at least one of the > > slr-pentax.xml files somewhere in one of the database paths has all > > the mappings ( tags) between the many Pentax K-something > > mounts, as found at the top of the current git version: > > > > https://github.com/lensfun/lensfun/blob/master/data/db/slr-pentax.xml > > See below, what is in /usr/share/lensfun/slr-pentax.xml That looks like it's up-to-date, so probably not the problem. > > If you've updated with the lensfun-update-data > > script, > > Not sure, but there are reports, that it doesn't work with Ubuntu > 16.04. I cannot find this script in my system. Where should it be? What > is the exact name with 0.2.8? Ubuntu packages this separately for some reason: https://packages.ubuntu.com/search?keywords=liblensfun-bin and apparently not at all for xenial, I don't know why. > Your profile can now be selected manually (only). I have put it > ~/.local/share/lensfun But it is not recognized automatically. I can't explain that. If there's any visible difference in the name used in the file and the name displayed by darktable, you could try adjusting it, otherwise I don't know... -- jys -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Vignetting correction for wide-angle lenses.
On Thu, Dec 8, 2016, at 10:47, Torsten Bronger wrote: > Hallöchen! > > Do you have a pointer for that? It would be really harmful for the > calibration work. I'm sorry, I think I was just aware of Hugin no longer including Lensfun support, and just incorrectly assumed it was due to correction model incompatibility. If that's not the case, I'm sure you would know better than me. By the way, uploads of calibration images to the owncloud server don't seem to be generating github issues lately, I just noticed. As far as getting vignetting data from hugin via panorama creation, what's the best way to process the raw files? I'm guessing that 16-bit TIFF with linear color profile and no base curve or white balance in darktable would work? -- jys -- Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/xeonphi ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Panasonic Lumix G 25mm F1.7 supported?
On Fri, Nov 18, 2016, at 06:14, Chris Chiappa wrote: > > I have the Oly, and it's a great little lens, but does need a fair > > amount of correction, which is well provided for in lensfun currently > > (I spent some time getting the vignetting right, which varies quite a > > bit with focus distance, in such a way that always applying the > > correction for infinity does some not-so-nice over-correcting at close > > range). > Hi, I believe that I was the one who submitted the original data for > this lens. I only calibrated at infinity because my camera at least > (Panasonic GX-7) does not seem to record the focal distance anywhere I > can see in the EXIF. Do other cameras do better here, or do you just > do a lot of manual fiddling with the correction? The Olympus E-PL6 gives reliable values for focus distance in exif tag 0x0305, which at least exiftool knows about: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Olympus.html I don't know about previous Olympus m43 models, but I do know that while the field existed in my XZ-1 and XZ-2 compacts, it was pretty much garbage. It's useful information for vignetting correction on at least *some* lenses, so hopefully it will become common. There's no similar FocusDistance tage listed for Panasonic, though, as far as I can tell: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Panasonic.html although I suppose it's possible that it exists but hasn't been "discovered" yet... Incidentally, I've been using the following correction line in my personal lensfun database for the 25/1.8, it uses the simpler, less computationally expensive poly3 model, which seems well suited to the distortion of this lens: If you agree that it performs well, it could be swapped into the official database... -- jys -- ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Lens calibration looking for help
On Tue, Jul 19, 2016, at 21:56, Torsten Bronger wrote: > Matthias Andree writes: > > > I also looked through the older materials on calibration and have > > been scratching my head over the illumination of vignetting test > > images, how do you get good ones. > > It is less critical than it seems. A diffuser in front of the lens > is always necessary, but in contrast to earlier texts of mine, I now > think it can even be paper (if absolutely level of course). The > actual ilumination should not cast a visible gradiant of the > diffuser but unless somebody points a laser pointer to it, I think > this will work in all practical cases. I found another interesting possibility for this recently, in the form of OLED mobile device screens. As mentioned in the existing tutorial, backlit displays don't make good sources of even lighting, but the OLED display on my current phone does a great job of this, as it turns out, when set to display an all-white screen[1]. Of course, it helps that my micro four-thirds lenses have fairly small front elements... and you would want to make sure your device screen is actually flat... Anyway, I'll try to get to some of the calibration chores too, pending updated hugin instructions. [1] handy android app for full-white screen: https://f-droid.org/repository/browse/?fdid=org.bc_bd.mrwhite -- jys -- What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Improved(?) OLYMPUS M.25mm F1.8 vignetting data.
On Wed, Jun 15, 2016, at 02:59, Torsten Bronger wrote: > Hallöchen! > > junkyardspar...@yepmail.net writes: > > > [...] The attached version seems to behave better throughout the > > focus range. > > Thank you for your contribution! Which camera did you use? (Just > for the record.) Olympus E-PL6, for the record. -- What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. http://pubads.g.doubleclick.net/gampad/clk?id=1444514421=/41014381 ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] Improved(?) OLYMPUS M.25mm F1.8 vignetting data.
Sorry, it became apparent at some point that the first version of this profile I mailed was overcorrecting under some circumstances (I may have had the focus set past infinity for the "infinity" shots). The attached version seems to behave better throughout the focus range. The vignetting on this lens changes substantially between its close focus point and infinity, so a single-distance profile such as in the current database is only going to be right about as often as the proverbial stopped clock. ;) On Thu, Mar 31, 2016, at 19:39, junkyardspar...@yepmail.net wrote: > I wasn't getting good results with the existing lensfun profile for this lens > at anything other than close focus distances. I generated a profile using > shots at infinity and minumum, and it works much better for me. These are the > numbers for anyone who wants to try them out (and maybe confirm that it's not > just my lens that's wonky)... > [...] > Also attached as the full profile I'm using in case the formatting gets > mangled. > > Cheers, > junkyardsparkle > Email had 1 attachment: > + Oly_25mm.xml > 2k (text/xml) Olympus OLYMPUS M.25mm F1.8 Micro 4/3 System 2.0 4:3 -- Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
[Lensfun-users] Improved(?) OLYMPUS M.25mm F1.8 vignetting data.
I wasn't getting good results with the existing lensfun profile for this lens at anything other than close focus distances. I generated a profile using shots at infinity and minumum, and it works much better for me. These are the numbers for anyone who wants to try them out (and maybe confirm that it's not just my lens that's wonky)... Also attached as the full profile I'm using in case the formatting gets mangled. Cheers, junkyardsparkle Olympus OLYMPUS M.25mm F1.8 Micro 4/3 System 2.0 4:3 -- Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785471=/4140___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] TCA overdone for Sony SAL-16105?
I'm not suggesting Lensfun be expanded to take focus distance into account, my impression is that this aspect of EXIF data isn't very reliable (yet) anyway... I was only suggesting that this could explain why a trustworthy TCA dataset could still produce the (non)correction the original poster was complaining about. It's also the reason why I never submitted my TCA calibrations for the Olympus XZ-2 to Lensfun; They seem to be wrong almost as often as they're right, and I suspect that optically complex zoom lenses with internal focus (such as the Sony lens in question) may exhibit this more than other cases. In any case, my solution is to use the manual TCA adjustment in the darktable lens correction module whenever it seems needed. In my case it's mostly with close focus images. On Wed, Jul 15, 2015, at 23:02, Torsten Bronger wrote: Hallöchen! junkyardspar...@yepmail.net writes: [...] I don't have a good understanding of optics, but I've found the calibration data that I made myself for a zoom lens can give perfect results for some images and wrong for others. The most obvious cases are when focus distance is very small. I wonder if the complexity of the various elements in some lenses means that proper correction would have to take focus distance into account? Of course the focus distance is important: Lensfun's corrections only work for focus at infinity, which is why I urge people to take test pictures at a minimal distance. Theoretically, Lensfun coud be expanded to take focus distance into account, but this makes calibration much more complex, and I personally don't think that people will do that. But it could be done, so if there is demand, just open a feature request. Regards, Torsten. -- Torsten BrongerJabber ID: torsten.bron...@jabber.rwth-aachen.de -- Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
Re: [Lensfun-users] TCA overdone for Sony SAL-16105?
On Wed, Jul 15, 2015, at 15:42, Torsten Bronger wrote: Hallöchen! Jan Kasprzak writes: [...] Is it possible that the lens profile of this lens in the lensfun database is wrong? This may well be, although the data seems to have been contributed by a trustful person. I don't have a good understanding of optics, but I've found the calibration data that I made myself for a zoom lens can give perfect results for some images and wrong for others. The most obvious cases are when focus distance is very small. I wonder if the complexity of the various elements in some lenses means that proper correction would have to take focus distance into account? -- junkyardsparkle -- Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ ___ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
