Split filter printing with a multigrade head such as the Arista vcl 4500 has the advantage of being able to go full blue and full green without touching the enlarger (no vibration) The control box is off to the side of the enlarger and allows you complete timer control of each exposure and the ability to burn or dodge on HC or LC! When changing filters on a single light source (Regular) enlarger you always risk vibration, this is also true with most color heads. Since you have to reset the filter on the head!
A very cool thing about the Leitz Focomat V35 is that it is so sturdily built that even though you adjust things on either a multigrade head or a color head, it never goes out of alignment. Ever. It is pin sharp no matter how many adjustments you make, and that's one of the many reasons I love that enlarger.
It's a damned fine enlarger.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh