thighslapper Posted April 4, 2014 Share #1 Posted April 4, 2014 (edited) Advertisement (gone after registration) I did not realise how much in-camera lens correction is applied to the XV images till I tried some HDR with Photoengine....... It is one of the few processors that use the pure unmodified RAW data in the conversions ...... here are 3 images ....... Original camera DNG HDR image from Photoengine showing the real amount of barrel distortion Photoengine image corrected in LR and cropped ...... Surprising how much of the image vanishes in producing the Leica corrected DNG ...... Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited April 4, 2014 by thighslapper 4 Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/224699-xvario-lens-distortion/?do=findComment&comment=2562644'>More sharing options...
Advertisement Posted April 4, 2014 Posted April 4, 2014 Hi thighslapper, Take a look here XVario lens distortion ........ I'm sure you'll find what you were looking for!
dunos Posted April 5, 2014 Share #2 Posted April 5, 2014 That's really quite something! You would never have thought that just by looking at the finished output. Thanks! Quote Link to post Share on other sites More sharing options...
XVarior Posted April 5, 2014 Share #3 Posted April 5, 2014 Other than the crop on the first one, I don't see any deference. Do you mean the original non corrected one is the one ion the middle? Am I blind today due to late nightclubbing last night! :-) Quote Link to post Share on other sites More sharing options...
barjohn Posted April 5, 2014 Share #4 Posted April 5, 2014 LR hides the barrel distortion and does not give you the ability to turn it off. It also crops the image as part of the distortion correction. Iridient Developer also lets you turn on or off the lens correction. Quote Link to post Share on other sites More sharing options...
dunos Posted April 5, 2014 Share #5 Posted April 5, 2014 Other than the crop on the first one, I don't see any deference. Do you mean the original non corrected one is the one ion the middle? Am I blind today due to late nightclubbing last night! :-) The non corrected one is in the middle (shot 2). Note how in the top and bottom shots the chairs look like they are in straight lines horizontally. Yet in the middle one they look like they curve in a crescent. Quote Link to post Share on other sites More sharing options...
firoze Posted April 5, 2014 Share #6 Posted April 5, 2014 I did not realise how much in-camera lens correction is applied to the XV images till I tried some HDR with Photoengine....... It is one of the few processors that use the pure unmodified RAW data in the conversions ...... here are 3 images ....... Original camera DNG HDR image from Photoengine showing the real amount of barrel distortion Photoengine image corrected in LR and cropped ...... Surprising how much of the image vanishes in producing the Leica corrected DNG ...... Did you try this shot with OOC JPEG? It would be interesting to know if the JPEG is similarly cropped or not. Quote Link to post Share on other sites More sharing options...
tom0511 Posted April 5, 2014 Share #7 Posted April 5, 2014 Advertisement (gone after registration) as long as the disotrion correction doesnt lead to any visible decrease in IQ I dont mind. Quote Link to post Share on other sites More sharing options...
thighslapper Posted April 5, 2014 Author Share #8 Posted April 5, 2014 as long as the disotrion correction doesnt lead to any visible decrease in IQ I dont mind. agreed ..... this was just a chance finding as the HDR results were really puzzling..... I thought things looked a bit odd in other images .... but this one with the chairs revealed what was going on.... apparently a lot of sub full 35mm frame cameras do this rather than attempt the more difficult task of getting the lens perfect...... what rather confuses me is how the image pixel dimensions remain unchanged even though the image is clearly cropped ...... unless the sensor actually records far more than the stated resolution to allow the wastage necessary to correct images at 18mm ...... or LR is adding pixels ..... Quote Link to post Share on other sites More sharing options...
MarkP Posted April 5, 2014 Share #9 Posted April 5, 2014 Other than the crop on the first one, I don't see any deference. Do you mean the original non corrected one is the one ion the middle? Am I blind today due to late nightclubbing last night! :-) Not only are you still so drunk/tired/whatever that you can't see the marked distortion, you can't spell :D:D. Try again when you've recovered 1 Quote Link to post Share on other sites More sharing options...
MarkP Posted April 5, 2014 Share #10 Posted April 5, 2014 How much distortion is evident at different focal lengths? Quote Link to post Share on other sites More sharing options...
XVarior Posted April 6, 2014 Share #11 Posted April 6, 2014 Not only are you still so drunk/tired/whatever that you can't see the marked distortion, you can't spell :D:D. Try again when you've recovered Hahaha, no no I was not drunk but sleepy. The post confuses me as I focused on the the last ken to be the original, only to find it was the middle one, I also focused in the walls for distortion not the center if the image the. I realized it was the one in the middle! Glad Leica is correcting this for us, my canon lens give me headaches correcting each time. Well, gave me headaches, I'm rarely using it these days. Quote Link to post Share on other sites More sharing options...
XVarior Posted April 6, 2014 Share #12 Posted April 6, 2014 agreed ..... this was just a chance finding as the HDR results were really puzzling..... I thought things looked a bit odd in other images .... but this one with the chairs revealed what was going on.... apparently a lot of sub full 35mm frame cameras do this rather than attempt the more difficult task of getting the lens perfect...... what rather confuses me is how the image pixel dimensions remain unchanged even though the image is clearly cropped ...... unless the sensor actually records far more than the stated resolution to allow the wastage necessary to correct images at 18mm ...... or LR is adding pixels ..... Yes, the sensor records far more than the stated pixels and also it. Captures a bit wider than the stated in order to allow the camera to get the corrections done. Quote Link to post Share on other sites More sharing options...
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