thank you Clive, will try that on a tree! Though I detect a divergence of words and meaning. With landscape panoramas one usually has a limited choice of viewpoint. In my waterside one, right outside the boat house ±3 ft, on Gordon's peaks, could be a 1000ft drop if you go back or forward much! So the question becomes:"from a given viewpoint, do you get the same result by using say 2 frames at FL 18± as you would with 4 or 5 at FL 80±?" Need to try that too.