I'm about to get into MF with a 6x6 camera. I've done some searching - it looks like the El-Nikkor 80/5.6 is a good dependable lens for enlarging. Is this right? I use an Nikkor 50/2.8 N for 35mm and have been reasonably happy with it, especially since I got it for ~$50 new. Are there any others I should look out for?