I'd like to get a really long lens to use with my Tech V 4x5. But I don't want to be messing around with changing anything on the camera itself. I think I read somewhere that the longest lens that can be calibrated to the rangefinder is a 300mm, which I already have, so I'm resigned to the fact that I'll need to focus on the GG if I'm to use anything longer.

What's the longest the Tech V's standard bellows will allow me to use? Can anyone suggest a sharp, "neutral" (i.e. something reasonably modern, without the need for mad bokeh or other unique effects) lens at that focal length?

I'm not in the least bit interested in "holy grails", just a reasonable quality standard working lens. Preferably something that I could pick up S/H in a shutter for a few hundred dollars max.

Thanks