The makers of 135mm enlarging lenses for 4x5 film have not heard of your rule.
Perhaps I should have said rule of thumb. The same rule applies to taking lenses. Yes you're right but you have to be careful in making a choice. As with most things in photography there are tradeoffs. There are 135 mm lens which will cover a 4x5 negative but they contain more elements and are more expensive. The cheaper ones may cause distortion, lower contrast, or light dropoff at the corners of the print.
Last edited by Gerald C Koch; 08-24-2012 at 12:30 AM. Click to view previous post history.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.