So I found myself an old Vivitar lens at the local camera shop and thought I'd take a chance on it. It is an older lens and appears to be single coated as opposed to MC. The lens is an interesting beast, and not surprising, much easier to handle on a tripod. I have only taken it out birding so far and it seems to be a decent lens. Now I must continually remind myself that it's not a modern lens, in image quality or price. It has some severe CA (lightroom 4 doesn't seem to help much either) and is moderatly sharp, but if I stop down a wee bit, it does seem to improve (again not surprising). Overall, I'm pleased with 8x10 prints and feel I can be quite satisfied with the IQ, but it does leave me longing for something more modern, when I can justify the price of such.