Originally posted by Parry Johnson Good point. Personally, I don't really like the term "good enough" as it's either good or it isn't. In most cases, an older lens can still produce a very good, if not excellent image, and ther real level of "good" is more due to the experience and creativity of the artist. So, you're not only doing a good job, but a great job!
I've used a lot of vintage glass and some of it is really poor on digital, so there are times when it is very difficult to take a good photo with them. I was given an immaculate Miranda 28mm, f2.8 and corner / edge performance was awful. As I am almost solely shooting landscape with vintage glass I need edge / corner sharpness so lens performance is interesting to me.
The 40 at 35mm performs in an entirely different league to the SP 28-135 - which was awful at 28mm, half the image was a blurry mess. It performs as well, if not better than the SP 28-80. I recently picked up the Vivitar Series 1 24-48 and took it out for a walk and it was awful, at 48mm only the centre is sharp, the rest is beyond soft, so blurred as to be hideously out of focus - so I am going to have to test that again, see if it was my focus.
Anyway, took the 40A out again: