Nick, you might be right, but this lens tech had 40+ years experience before he retired a couple years back. He told me mechanically it is so weak that you should not transport this lens top down. The focus is very uneven over a flat image. Most of the time you have to rotate one of the optical parts to get it right. He could not apparrantly. I migth bring it to Truelens services from the UK when they are in Amsterdam at IBCT. They might have a look at it, maybe it is worth to spend a couple of hundreds more on it.