Full Format Cameras How Do You Know If A Lens Works On A Full-frame DSLR?

How do you know if a lens works on a full-frame dSLR? - full format cameras

I have a digital SLR system entry, and I think going to full screen soon. The research of lenses on the Internet that I could not see, APS-C lenses on full frame cameras. Some stores do not specify, this point in the product description. How do you know? Are there any lenses that work in both formats?