I've used Nikon manual focus lenses for many years and have always been happy with both performance and mechanical reliability. I cannot say the same for some of their AFD lenses though. My main gripe at the moment is with the 35mm f2 AFD. Oil has leaked onto the diaphram blades for the third time since new, and it always occurs just outside the guarantee period for the last repair. This causes a sluggish diaphragm and gross overexposure. Having just put this into repair at Nikon and pointed out previous repairs for the same fault, I would have thought they would have taken this into consideration when estimating the charge, apparently not so. If I go ahead with this repair then I will have spent more on repairs than the lens cost new. My previous 35mm f2 Nikon manual A1 lens went through 20 years of hard professional usage and despite its slightly battered appearance, works as sweetly as ever. Do customer relations count for anything anymore?