Quote Originally Posted by Dr Croubie View Post
Back to the OP, why is 90mm the 'standard'? Because lens designs back in the day of "angulons" could only get so wide in terms of degrees of coverage, and 90mm just happened to be the length that covered 4x5 nicely (wide open and/or with movements, whatever the market thought was 'good enough').
Only so wide? Is that so? See http://trichromie.free.fr/trichromie.../27/PERIGRAPHE ; http://www.cameraeccentric.com/html/info/zeiss_3.html , p. 36; http://www.cameraeccentric.com/html/info/cooke_2.html , p. 9. Re the Cooke Anglic, at 100 degrees the 2.5 incher covers more than 4x5. And let's not forget the widest of them all, see http://www.cameraeccentric.com/html/info/goerz_2.html , p. 35

You shouldn't make things up.