I want to get the K1 because it's the shortest tube for Nikon at 5.8mm-is that correct? But it's pre AI-I know pre AI is a no no on D300. But since it has no meter coupling linkage(am I correct there)is it ok to use? A tube this short would be good making wide angle lenses focus closer. I have the PK-12 and at 14mm, it's way too much for wide angles.
D7100 D300, F4e, N90s, N6006, N2000, N6000, D40, N5005, black F2 eye level, chrome F2AS, black Nikomat FTN
Non Nikons: Pentax 645, Pentax ME Super, Pentax Spotmatic II, Minoltas SRT 102, SRT 202, Maxxums 7000 and 7000i, Praktica LB, Kiev 4 rangefinder, Canons TX, A1, FT QL, EF, EOS 630