Hi fatchai.
Q1 - Some people do this so that the image circle completly fills the CCD up to the top and bottom. I haven't tired it yet. But I believe you would get a bigger image and therfor more pixels in the hemi. So I would say yes, you would get a higher quality hemi.
Q2 - A 3 shot will produce better quality because you are using 1 hemi more pixels in the total image. Better tonal range and more pixels to work with. Also it is more forgiving in seaming. You still have the white balance issues just like 2 shot.
Q3 - using a 1600x1200 hemi I think the max size you should display at is 450 pixels. Anything over that will start making the image less sharp. The size of the pano meaning the dimensional size(4000x2000 or 1400x700) and the viewer size are related. If you try to display a 1400x700 pano at 600 pixels wide it is going to be a soft image. Same image displayed at 400x300 is going to be nice and sharp providing you have a good quality pano that is properly color balanced.
If I want to display the image larger than 500 pixels wide I make the pano at 4000x2000. Open in Photoshop and size it down in steps applying the unsharpen mask each time at about 10 percent. I take it down to say 2000x1000. That is 1/2 half the original size. I do this in 3 or 4 steps. On the last step I apply a little more unsharpen at about 25 percent or so. I find this makes a sharper image than setting the size to custom in PW. But that is just my opinion. This resized image can now be displayed at about 600 pixels wide and still look pretty good.
A 5 megapixel camera will make good panos at 600 pixels wide or less but if you dislpay them bigger than that you will suffer some qualtiy loss ie... soft image and some pixelation depending on the tonal range.
At 1600x1200 this equals a 1.92 megapixel image. A 1280x960 image equals 1.23 megapixel image. The more total pixels the better the final image will be so the larger you can make the original image the better. That is where the higher megapixel camera comes in. The image is at 300 dpi regardless. The higher the megapixels of the camera the LARGER the image is
The CP5000 can make a max size image of 2560x1920. That equals 4.92 megapixels(effective). Your Camera at 1600x1200 max size equals 1.92 megapixels.
But this is only relavent when making panos displayed at 600 pixels wide or larger. 5 megapixles is plenty to make a good quality pano displayed at 600 pixels wide or less. If you need to display at larger than that than that you need more megapixels and better optics like the Sigma 8mm and a 4 shot pano.
Now all that said a 2560x1920 hemi will still make a pretty good 800x600 displayed pano. It is just not as crisp as the smaller size but not that bad. You can definitly tell the difference between these and one made with a Sigma 8mm (the better optics pay off).
1600x1200 hemi will make good panos for sure but will suffer some sharpness issues displayed at over 550 pixles wide.
Gen. Lee
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