<p>Katz eye makes a focusing screen for modern DSLRs for this kind of usage.<br>
here is a link.<br>
http://www.katzeyeoptics.com/page--Katz-Eye-Plus--plus.html</p>
<p>I have all three. The 50 f1.2, the 45 f2.8P and the 35 f1.4. All are great lenses and none of them will leave you needing. The 35 f1.4 is the longest with it's metal lens hood followed by the 50. The 45 is a pancake and very compact light lens.</p>
<p>Nicholas, IDimager looks like an interesting option and appears to be portable too. Price wise their server ed is reasonable, but will require a server and dedicated database server</p>
<p>A single Media Pro License allows you to use the program on two separate computers as does Capture One. As for different Media Pro one catalog configurations there are a number of youtube vids on the topic. Here is a link:<br>
<p>If you have a NAS drive you may be able to set up the two different computers to sync with the single catalog.</p>