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I'm 36. Shoot 4x5 and 6x6 for couple of years.

For magnification bigger than 1:1, one should reverce the lens.

Rule of optics is simple: smaller object goes in front of 'rear element' of the lens, bigger object in front of 'front element'.
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I use 80/4 Apo-Rodagon N on Sinar F2, no shutter, lens is mounted normaly (not reverse) on custom-built plate. In dark studio, I pull out dark slide from film holder, wait about 1-2 sec to cut the ...

Get Horseman bag bellows. You could use it with 47-150mm lenses on flat board. Use 6' rail. Good luck.

Yes. I had the same problem. My nails is trimmed and I couldn't slip my nail under the film if holder is lay down. . Now I keep the holder verticaly, like this:[===] and film separates from holder...

Sinar. It's like Nikon or Hassy. You can always find a lot of them used. I use F2 in studio and fild. Frankly, it's not perfect for both. In studio, when doing makro 2:1 it's not rigid and precise...

<a href="http://www.archiphoto.com/personal%20pages/LFlenses.html">Here</ a> is some lense ideas.

Friend of mine have a couple of 25" f/9-256 Rodestock Apo-Ronar in barrel for sale.

CHRISTOPH GREINER PHOTOGRAPHIE. Prices are equal or lower than Robert has (depends on the #/DEM ratio)

I use Rodenstock Apo-Rodagon-N 80/4 for macro work.

Sorry for misprint, it should be 80/4@f22 ;)

Well, here is Rodenstock Apo-Rodagon N 80/2.8@f22 on Sinar F2, Velvia, drum scan.

Making a DOF calculator for any camera is her e.