Hi Georges and Smooth,
I have the same question for a long time. In fact, I never switched to PW6 and stayed with PW5 since I've never been able to find the right parameters and didnt get any answer from Easypano customer support. In PW5, it was not necessary to set this parameter and everything was ok except that almost each time I want to run this software, I have to delete the setting.dat file and to reenter all my preference smartblend parameters. If someone has a solution for this issue I welcome any idea (again support didnt help).
What I know is that with the auto mode, stitching doesn't work fine in PW6 or 7.
I use a Canon 50D (1.6x crop factor) and Sigma 8 mm which means 4 shoots for a 360 and drum fishyes selection in PW.
It would be interesting to understand how this HFOV is calculated. In PW7 auto mode, it gives a HFOV of 110.24. In this configuration, stitching doesn't occur right. In noticed that I don't get any matching point between image 3 and 4 and PW6 or 7 doesn't claim for manual settings of this matching point?
I've also noticed in PW6 that with my camera configuration, I get a dead zone on top (I do not shoot ceiling) which is normal. However, if the settings were right, this zone should appear as a square when you do a preview of the spherical image. In my case, I get a rectangle, so 2 of the initial image are stretched more than the other two which is visible in the 360 view.
It would be interesting to get an answer from the software developer on that subject and maybe get a parameter table depending on the shooting configuration (camera + lens). Something else to improve would be the matching point checking window. I should show the matching pairs as follow. 1-2 / 2-3 / 3-4 / 4-1 and not 1-2 / 2-1 / 3-2 / 4-1.
As professional user of Easypano software, I would love to use the last version, but as of today, I prefer to stay with my old version (PW5) that I understand rather than using the last version that I dont understand how it works.
I also use DXO but after stitching so it deosn't modify the original pictures before stitching.
Best regards, Laurent.