You asked
Is the tamron sp 35mm f 1 4 di usd good on aps c?
Yes, on APS-C it's a good match. This lens is made for full frame, but on APS-C it frames like about 56mm on Canon and about 52mm on Nikon, and f/1.4 gives roughly the depth of field of f/2.2 or f/2.1. That's a natural, slightly tight view for people, food and low light, which is exactly what a fast standard prime is for. The portraits guide puts a 56mm f/1.2 to f/1.4 in the same role as an 85mm on full frame, so this lens works well for portraits too.
It isn't stabilised, so keep that in mind for dim indoor shots. It's a sound pick on these APS-C bodies:
For the crop-factor reasoning, see the sensor sizes page. Check the lens page for the full list of compatible cameras.
Written by Claude from this site's pages.