Hi dsulvett, welcome to the forum
While we do not take real estate panoramas so you are safe.. no competition here. We do use a Sigma 8mm f3.5 lens. And we take 4 images for a full 360 around the horizon and 180 degrees vertical field of view. The way you reduce the fisheye affect is to set your zoom in (FOV) to around 90 degrees across the horizon. 90 degrees is about normal eye sight which gets rid of fisheye barrel distortion.
From what I read here in the formum most all use a Sigma 8mm, Nikon 10.5mm or Tokina 10-17 fisheye lens.
We also have and use a Canon 10 - 22mm wide angle lens for single images of hotel rooms, but not for panoramas. Panoweaver will not stitch wide angle lens images. So you will need to find another stitcher software. However, your in luck.. Tourweaver will accomodate wide angle 90 to 120 degree vertical field of view full 360 degree around panoramas. Key factor here is.. when loading your cylinder image.. tourweaver VIEWER maps a full sphere image... so you will need to truncate your vertical field of view down to the height of your cylinder image. You may want to consider taking a panorama (or use an existing Canon 10-22mm @10mm FULL 360 panorama) and try it out in the Trial Version of Tourweaver 3... see how it works.
Nice thing about this.. if you choose a Sigma 8mm lens instead of the Canon 10-22mm wide angle you can buy Studio 2007 [Tourweaver 3 and Panoweaver 5] and take it off on your year end income tax as a valid expense in doing business.
I am not a tax adviser and do not practice law. But it is something to think about.
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