Hello guys and girls,

I am just getting started in large format photography, I bought and assembled my own "Bulldog" LFC and recently I bought a Fujion 180mm/5.6f lens of ebay (Image circle was 280phi according to seller). Could someone tell me, how many milimeters that is?

And most importantly, it seems that I have to move the lens very far away from the camera, before I get a sharp image (at infinity). This point is almost the outer limit of my forward extension. Now, is this a normal phenomenon? Is there a formula that, given a focal size and image circle, tells you which distances from the lens to the focusing screen make an object which is x meters away from the camera look sharp?

Thank you very much
Kind regards!