Camera Field of view

[NR1168]

Hi,
Is there any problem if I use large field of view for image acquisition and use in photoscan for accumulation? Currently I am using a 16mm lense from a height of 11 m. and it gives me a field of view 16.2 m*10.7m. And my fields size are field 1: 84m*24m and field 2: 100m*9.8m.
Every time I made a 5-6 flight line for my drone. But I found that 1-2line flight is enough to cover the whole filed because of bigger field of view. But it did not give good result. Even full flight of 6lines also sometimes cannot give me good result. Is it the fault of lense or field of view that it takes almost same image every time because of bigger field of view.

Wahat should I do? Do I need to change lense? If yes then which size will be good? I am also concern about resolution.
 
Please give me some suggestion if there is any solution and How can I improve my accumulation.

Thanks

[Outis79]

Hi,
I'm not an expert, personally I've never shot with lens wider than 18mm so I can't say if they are too much wide (they look like to me) and affected by too many distortions.
I don't get exactly what's your problem, is the alignement unsuccessfull? do you get a distorted mesh or DEM?
Do you have GCPs for the alignment optimization? If you have used them and still don't have an acceptable result, I would then "crop" (using masks in photoscan) the images keeping only the central part of them, that is affected by smaller distortions, and perform again the alignment. Be sure when masking to keep a good overlap among the images.
In order to use the same mask you might create it on one image, export it and import it for each other image.
I hope this can help you.