not as sharp as espected (noisy)

[alexb]

hello,
i'm doing test  to see how I coul scan small objects on a turntable.
I use a 35mm at f16 on a nikon 5100 (so its 56mm) (100iso)
i'm shooting with 2 flash on a softbox.
there is 95 shots but my result are alway far from good...
what am i doing wrong? what should I change 1st?
wider angle lens? more lights? more photos?
thank you for your help.

[meshmaster]

The problem may be that the object is is quite smooth and lacking "texture" (note the specular highlights). Smooth, shiny, featureless surfaces are non-starters for photogrammetry.  You could try projecting a dense noise pattern onto the object, that might improve your results.

Also, f16 might be a bit high, I don't recommend going past f11 due to the softening of the image from diffusion.

Cheers,

J

[alexb]

thank you fot the help.
ok i'll try an other object on the same setup, and post the results.