You asked
Is the tamron 35 100mm f 2 8 di iii vxd good on aps c?
Yes, it's a solid choice on APS-C. The lens is designed for full frame, but on an APS-C body it frames like a 52-150mm, which covers portraits and events well. f/2.8 also gives about the depth of field of f/4.2 there, so backgrounds still soften nicely. If you want to compare it with other lenses on a common basis, the focal length converter shows how the crop changes the framing.
It fits APS-C bodies from both Sony and Nikon, including the Sony a6600 and Nikon Z50 II. For more on how focal lengths suit people, see the portraits guide.
Written by Claude from this site's pages.