NedL, I'm sorry I criticized a lens that might be the one you use and rely on. The older-style lens in the community darkroom pleased me quite a bit. The one I bought that disappointed me was the "newer-style" 50mm f/2.8 El-Nikkor N.
Originally Posted by NedL
I was young and inexperienced.
I just checked my vintage 8x10 prints that I know were made using that lens.
The issues I see (grain blur on corners) could very well be attributed to enlarger misalignment.
Don't be discouraged. I am sure your lens is fine.