While I there are no illusions they would compete with even a low-MP MFDB for max IQ, if you wanted a couple of lower-budget DSLR-based options to consider:
1. As JF mentioned, an M645 bellows kit + LF or Hassy/M645 lens and adapter for a Nikon or Canon body (both easily done); or a Nikon PB-4 bellows system (tilt if bellows rotated) with a Nikon or Canon body (via adapter) using, again, M645/Hassy glass.
2. Use of a Canon body with a Mirex TS adapter and M645 or (IIRC) Hassy lenses such as the 80/4 Macro, 120/4 Macro (APO) or the Hassy 120/4, etc. I also believe, but don't quote me, that Mirex makes a Hassy-Nikon kit. I couldn't tell you how the TS ranges of the two system would compare.
I have no idea which Canon body you currently shoot with, but the #2 approach is popular with many folks over on the FM Alternate Lens forum if you want to research it further.
There is also this recent thread discussing a 5DII using a PB-4 bellows kit+Rodenstock 75/4 APO (for macro work) that has some nice samples.
http://www.fredmiranda.com/forum/topic/747695
1. As JF mentioned, an M645 bellows kit + LF or Hassy/M645 lens and adapter for a Nikon or Canon body (both easily done); or a Nikon PB-4 bellows system (tilt if bellows rotated) with a Nikon or Canon body (via adapter) using, again, M645/Hassy glass.
2. Use of a Canon body with a Mirex TS adapter and M645 or (IIRC) Hassy lenses such as the 80/4 Macro, 120/4 Macro (APO) or the Hassy 120/4, etc. I also believe, but don't quote me, that Mirex makes a Hassy-Nikon kit. I couldn't tell you how the TS ranges of the two system would compare.
I have no idea which Canon body you currently shoot with, but the #2 approach is popular with many folks over on the FM Alternate Lens forum if you want to research it further.
There is also this recent thread discussing a 5DII using a PB-4 bellows kit+Rodenstock 75/4 APO (for macro work) that has some nice samples.
http://www.fredmiranda.com/forum/topic/747695