They ain&#39;t that expensive...I shoot Hasselblad and use other
Zeiss products...microscopes, sunglasses...etc.  Ya know, the
SCA 390 is the cheapest part of my camera&#33; He He...
Seriously, the SCA&#39;s may seem expensive, but the
interchangability is great. I use 60s and 45s during the "main"
shoot, then 40s for casual shooting and for keeping in my pack,
and I&#39;m gonna get 2 70s for sidelighting wirelessly (other
than my Pocketwizards), but the adapter is the only piece that
stays. Plus, when I get done paying 1000.00 for the 70s, all I
gotta do is stick the "plain" hot shoe onto the strobes to use
on my RB/RZ set.  Also, it&#39;s great when the other shooters
working with you have Metz adapters too. Often, I "share" my
strobes with them when their Sunpaks crap out during the shoot
(common with 511, 522 and 611 units).