Yes, I have a large collection of
AI-S lenses, actually it's my mum's from when she was a pro photog. I had planned on using them when I first got the D70. However, having experienced the magic of AF-S of the 18-70DX kit lens and auto focus in general, I pretty much became too lazy to bother with manual focus and exposure... I'm seriously looking to replace the older MF lenses with equivalent AF.
There's nothing to stop you from using them on a D70, but it restricts you to manual
mode only, and no exposure metering (which the D1 and D2 series have IIRC). Also since aperture doens't register on the body, the field in EXIF is missing - which means you either have to take good notes at the time of shooting or be forever guessing what settings you had set when you took the image.
I thought I would enjoy the academic challenge, however I've become far more lazy than I had anticipated and perceive using manual lenses on the D70 as an extra hassle I can do without. I hope you don't become like me!
I believe using the PB4 extension tubes requires use of a spacer too, to avoid bits coming into contact with protruding parts on the D70 body.
Edit: I forgot to add - I tend to find the old Nikkors which were great on film tend to produce reduced contrast images with digital, which I rightly or wrongly attribute to the combination of shiny sensor and uncoated rear elements contributing to internal flaring. I was disappointed especially with the performance of the 135 f/2.8 prime. Not only has the D70's APS-C sized sensor rendered it too long for use as a portrait lens, but it produces a noticeably softer look and reduced contrast which is not to my liking (compared to what I remember it on film).
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