Panasonic G3 lens not corrected

[grubernd]

i just took a long good look into THE open lens database project, aka Lensfun, and unless i have missed something important, this is one of the saddest open-source places i have been to in a long time. the database files are old (march 2010), full of holes and mostly just a bad conversion job from the old PTLens database, when it was still open (2006). the database in AftershotPro is much more evolved. if some devs of the lensfun-project read this and disagree - please enlighten me. and make your public documentation better.

of course this doesnt help with "my lens aint corrected although it is detected" .. but at least it shows that help from above (deus ex machina) aint gonna happen. and given the amount of work that calibrating a single zoom involves and the amount of cameras supported by ASP, it is no surprise that even some popular lenses like the panasonic µ43 kitzoom are not there yet. heck, i use that lens and i dont care about the lens correction and i haven't encountered a situation that would bring me to the point to really calibrate it.

anyway, here's my hack-version for the 14mm setting - the lens has a serious mustache-error, so this is a visual approach. i shot my bathroom tiles, openend the image in aftershot, dialed around for like 10 minutes by hand after hugin just gave me unrealistic results (mustache!) and here is what i came up with:

Code: Select all

lens = Lumix G Vario 14-42mm f/3.5-5.6
focal length = 14mm

c = -0.045
b = -0.025
a =  0.006

and if you find the situation you are in "untenable" - do something about it.
complaining has never made this world a better place. ever.



cheers,
grubernd

[Denis de Gannes]

i just took a long good look into THE open lens database project, aka Lensfun, and unless i have missed something important, this is one of the saddest open-source places i have been to in a long time. the database files are old (march 2010), full of holes and mostly just a bad conversion job from the old PTLens database, when it was still open (2006). the database in AftershotPro is much more evolved. if some devs of the lensfun-project read this and disagree - please enlighten me. and make your public documentation better.

of course this doesnt help with "my lens aint corrected although it is detected" .. but at least it shows that help from above (deus ex machina) aint gonna happen. and given the amount of work that calibrating a single zoom involves and the amount of cameras supported by ASP, it is no surprise that even some popular lenses like the panasonic µ43 kitzoom are not there yet. heck, i use that lens and i dont care about the lens correction and i haven't encountered a situation that would bring me to the point to really calibrate it.

anyway, here's my hack-version for the 14mm setting - the lens has a serious mustache-error, so this is a visual approach. i shot my bathroom tiles, openend the image in aftershot, dialed around for like 10 minutes by hand after hugin just gave me unrealistic results (mustache!) and here is what i came up with:

Code: Select all

lens = Lumix G Vario 14-42mm f/3.5-5.6
focal length = 14mm

c = -0.045
b = -0.025
a =  0.006

and if you find the situation you are in "untenable" - do something about it.
complaining has never made this world a better place. ever.



cheers,
grubernd

Thanks for the advice and trouble you went through to create the adjustments you think are necessary.
However the way I assess the situation is;

The necessary lens correction to the raw files are required due to the design of the m4/3 cameras and lenses so it makes no sense ASP stating they have support for the G3 and other m4/3 cameras if they are not going to apply the corrections which are carried within the raw files. If it is too much trouble to do so then the best option is to not provide support.

I have other options because the other three raw converters I use do provide the corrections automatically when I select the raw files, no requirement to go to the lens correction function to activate. Lightroom, Capture One Express and Qimage Ultimate.

Maybe Panasonic did not recognize who Bibble Labs were but I am sure they should be aware of who Corel is and might agree to provide some info on the procedure required.

[grubernd]

The necessary lens correction to the raw files are required due to the design of the m4/3 cameras and lenses so it makes no sense ASP stating they have support for the G3 and other m4/3 cameras if they are not going to apply the corrections which are carried within the raw files. If it is too much trouble to do so then the best option is to not provide support.

I have other options because the other three raw converters I use do provide the corrections automatically when I select the raw files, no requirement to go to the lens correction function to activate. Lightroom, Capture One Express and Qimage Ultimate.

Maybe Panasonic did not recognize who Bibble Labs were but I am sure they should be aware of who Corel is and might agree to provide some info on the procedure required.

well, that is a matter of how one sees this, that's true. i for one would be very unhappy if ASP wouldnt support my camera, just because the lens in front isnt corrected. i dont shoot architecture or repros, so whatever. a µ43 camera with the kitlens wouldnt be an appropriate tool for that kinda work, anyway. i do know that the curved lines can be somehow distracting sometimes, and since the camera even corrects that for the viewfinder it is not possible to do wysiwyg shooting.

the information is out there, well sort of, even without panasonic telling it: http://syscall.eu/#pana
but those numbers are not compatible with the correction model ASP uses, as far as i can tell.

PS: if you look at the qimage homepage, you will see that you are one of the few lucky users that has a distortion-correction-supported camera. so congrats on your luck.

PPS: maybe if i am bored one of these days i'll do the correction for the whole 14-42 by hand, but dont hold your breath. "boredom" is something i have to look up in the dictionary and everytime i do so, i wonder what it is all about.