Leica User Forum - View Single Post - Will IR cut filters AND coding be necessary on longer lenses?

edlaurpic · 11/23/06, 08:30 PM

Perhaps I am a little thick, but what I have been reading seems contradictory. At first I understood that 6 bit coding would be necessary only on lenses longer than 28mm to reduce unwanted vignetting and that other than that function, the codiing only added exif data. Then it seemed that the 6 bit coding could also reduce or eliminate cyan in the corners of images shot with the IR filter, but, again, I thought this was only an issue with lenses longer than 28mm.

I had the impression that the use of UV/IR cut filters, alone, on lenses 28mm or longer is all we would need to tame the magenta beast and get good AWB. Is this true? Or do we need to have the 6 bit coding AND the filters even on lenses longer than 28mm?

This isn't a trivial question for me, as I have a dozen lenses longer than 28mm that will not only need filters (only two of which Leica is apparently going to offer to provide tomorrow), but the lenses would also need 6 bit coding (not just for exif data but also for image quality).

Your advice will be much appreciated.

Please forgive this post if it has already been covered in other threads, but even though I have read the posts on this and related topics, this is still not clear to me.

11/23/06, 08:30 PM	#1 (permalink)
edlaurpic Benutzer Join Date: 12/05/05 Posts: 86	Will IR cut filters AND coding be necessary on longer lenses? Perhaps I am a little thick, but what I have been reading seems contradictory. At first I understood that 6 bit coding would be necessary only on lenses longer than 28mm to reduce unwanted vignetting and that other than that function, the codiing only added exif data. Then it seemed that the 6 bit coding could also reduce or eliminate cyan in the corners of images shot with the IR filter, but, again, I thought this was only an issue with lenses longer than 28mm. I had the impression that the use of UV/IR cut filters, alone, on lenses 28mm or longer is all we would need to tame the magenta beast and get good AWB. Is this true? Or do we need to have the 6 bit coding AND the filters even on lenses longer than 28mm? This isn't a trivial question for me, as I have a dozen lenses longer than 28mm that will not only need filters (only two of which Leica is apparently going to offer to provide tomorrow), but the lenses would also need 6 bit coding (not just for exif data but also for image quality). Your advice will be much appreciated. Please forgive this post if it has already been covered in other threads, but even though I have read the posts on this and related topics, this is still not clear to me.