Hi Andy...firstly thanks much for your wealth of information on lenses and your willingness to endlessly share. I read on a sub-forum that you have a Schneider /Century x0.7 wide adapter and a x.55, both with 77mm rear thread. Two questions (1)Where did you obtain them from and/ or can you possibly advise of a source for them (2)Is there a distortion level with these added optics , or are they acceptable relative to the image the 28-70 Nikon f2.8 produces without using the wide adapters. Thanks much as always, cheers, Fritz