Well, I'm in the market for a wider lens for my Linhof Color 4x5...my widest lens being the 100 2.8 which only works
on my 6x9 back...I have a 690 Fuji rangefinder for that.
90mm is good, but I'm looking a bit wider perhaps, and wondered if anyone out there uses the
RODENSTOCK GRANDAGON 75mm f6.8 on their Linhof Color.
I haven't used my Linhof Color for quite a while, but should imagine that the 75mm would be fine, although you will not get much movement without a bag bellows. When I used the color with a 90mm I just relocated the tripod collar to behind the rear standard, allowing the front and rear to come close together, but you probably are aware of that.
The 75mm lenses are quite useful (I have a Super Angulon) giving a good wide angle view but not too extreme.