Oz - since I believe you and I have similar 700x500 machines, in your experience, what specific lens length is the all around best compromise? 90? 80?
When I open up the lid on my machine and measure from the angled front area of the opened lid (most flat area when lid is raised) down to the bed, it appears I will have in the 600-620 mm range. I have done the calculations on the ordering page and those say I can theoretically use 80 and higher.