First off, let me say that I'm far from an expert in MFDB's. I've been a photographer for 18 years though and have been working in the digital realm since buying my first Mac in 1996. I don't expect this review to be definitive: it's just one busy pro's experience in trying to make a MFDB buying decision. The technical details aren't as important to me as the reality of what's going to help me do my job better.
I'm a people photographer (advertising and portraits - mostly on location) who's main interest in shooting medium format isn't really the extra pixels, but the higher sync speed, extra bit depth, and angle of view of the larger format. I shot medium format film for years before switching to small format digital. Recently, I've begun to miss the process of shooting medium format so I began looking into MFDB's.
My search narrowed down to two backs: the P21+ and the Leaf Aptus 22. I liked them because of their relatively fast recycle times. I hate missing the great shots when photographing people so this is really important - if not the most important - criteria for me. The P21+ is less than a sec and the A22 is just over a second. I also checked out the Aptus 54s which is as fast as the P21+, but I ruled it out due to cost.
I liked speed of the P21+. It could almost keep up with the H2's motordrive and it was easy to get into a rhythm shooting with it. I didn't do any fancy IQ analysis, but images looked great for my needs. Head and shoulders above my 5D files.
What I didn't like was the 1.3 crop factor, the placement and usability of the histogram on the back and the overall usability of the menu system. I used it for a solid week but never got the hang of it. I hated how the histogram was hard to read and covered the image on the LCD. I live off of a quick peek at the histogram since my scenes are fluid and often changing.
In contrast, I liked the Aptus 22 because it's menu system was so much easier to use. The histogram is easy to access. White balancing is a snap and you can do it by just clicking on the LCD. Really cool. The 22 has 4 more megapixels and it shows. The difference between these files and what I'm used to is just a whole 'nother level. I also how liked the larger sensor (a 1.1 crop factor) gave me more of the MF look that I'm going for.
The Aptus back takes longer to start up however. The P21+ fires right up which makes it more convenient to turn on and off during shoots. I shot the better part of a day with the P21+ out in the desert and never had to change a battery. On the other hand, the 22 sucked down a battery after shooting a few dozen images and then being left on in between shots and subsequent editing sessions. It also takes a lot longer to fire up.
The Aptus back I used is for the Hassie H system. I'm using it with a mechanical adapter for the RZ67 however. I'm using the cord from the lens to the back. No big deal. From reading threads here, I thought it would be a hassle. Instead it's a non-issue. I love being able to rotate the back to go from vertical to horiz. The back is plenty fast enough to keep up with the RZ. I never have to wait from shot to shot. I also like the flexibility of being able to use the H system if I want.
On the software front, Capture One is so much more robust than Leaf Capture. I'm no expert in either, but the Leaf software is better than nothing. But that's about it. Doesn't really matter since I'll use Photoshop either way.
In the end, I decided to go with the Aptus 22 back. Best of all, I picked up one in like new condition for $8k on Ebay. That's $4k less than the price of the P21+ (which I haven't see used or refurbed). Hopefully, this helps someone. I appreciate the advice I've received on this forum so I figured I'd pass some along as well.
John
