Archived posting to the Leica Users Group, 2006/10/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Frank, I must have explained poorly. What I meant was vignetting correction information being applied by the camera firmware then stored in the RAW file, as well as EXIF info for aperture, shutter speed etc,. So when you later opened the file with (compliant)RAW converter software you could use/ignore this information, in the same way you can alter the other values, like colour temperature, without affecting the original file. If the camera firmware always applies this correction, then it would make sense that it is always in the jpgs but optional to use in RAW files. So pictures from a non bit coded lens would be missing some EXIF data and any customisation generated by the code. Here's the original info from the early announcement in a Leica newsletter back in July. "The lenses are compatible with the planned digital M camera even without retrofitting, except that the additional features cannot be used. The lens coding is called '6-bit coding' because six fields in the bayonet ring are marked in black or white to represent a number from 1 to 64 in binary code. The planned digital M camera reads this information optically and can identify the lens on the basis of this code. Apart from the improvement in image quality, this information is also written into the EXIF image file". I may well be completely off track here, I am by no means expert, nor have any experience with this. I just like to expand my knowledge. Cheers Hoppy -----Original Message----- From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of Frank Filippone Sent: Thursday, 12 October 2006 16:42 To: 'Leica Users Group' Subject: RE: [Leica] LHSA meeting in Wetzlar; Leica Camera AG I doubt it. It is a simple thing to do in the camera, you don't need no stinking 5GHz Pentium super duper processor. But then again, theEXIF file may provide the lens data, and some add-in that is tuned to this camera, provides the gain algorithm in the computer. If it were done on the computer from user supplied data ( No coded lenses were used) , it would be necessary for you to remember the lens you used to take that picture... highly doubtful that if you came back from 3 weeks in Europe with 45,395 pictures that you could remember which lens took what picture......the true reason for coded lenses.... Senioritis..... There is also the issue that the oblique angle from a 28 Elmarit might be different than a 28 Summicron....so the specific lens design will affect the algorithm. I do not see this in the lens coding possibilities. I still don't get it, and like I said, it could be marketing hype...... Frank Filippone red735i@earthlink.net My interpretation of Leica's info release was that the correction data was stored within the RAW file, like white balance information and could be used or disregarded. Hoppy _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information