The problem is that Hugin is trying to correct vignetting, but your photos 
overlap perfectly and this is giving bad vignetting parameters (Hugin expects 
partial overlap).
You need to use the 'advanced' Hugin option and use the 'reset exposure and 
vignetting' function before stitching.

The 'rectilinear' lens type is working for you because your photos have the 
same centre, but if they are even slightly misaligned you will get much better 
results with a 'fisheye' lens type.
Also if you use the right lens geometry Hugin can do other useful things you 
might want, like output an equal area projection.

I would recommend calibrating this lens by stitching a normal panorama and 
saving these parameters for future projects, this will save a lot of time and 
give consistent better results.

-- 
Bruno


On 29 March 2016 12:06:13 BST, JuanManuel Cellini wrote:
>
>Thanks for your Reply Dklol.
>
>I post 2 print screens of my problem, 2 original photos and 2 Stitch as
>
>result.
>I managed to use the data I post (Lens = Normal (r) Focal L = 100 mm
>Focal 
>M = 1 x) becouse I had better results stitching the pictures. But the 
>problem itself is the product. As you can see, the best result I had is
>the 
>preview in the print screen.
>
>Why? Becouse I need to measure Forest Cover, and as you can see, only
>the 
>preview picture without the PHOTOMETRICS is the best.
>
>How can I save this preview picture? 

-- 
Bruno

-- 
A list of frequently asked questions is available at: 
http://wiki.panotools.org/Hugin_FAQ
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