For Canon EOS cameras
With this adapter you can use Pentax K-mount lens on Canon EOS camera. Although the lens will fit physically, automatic diaphragm, auto-focusing or any other functions will not operate correctly while using this adapter. This is designed for operating with manual settings and camera Manual mode.
A T-Adapter allows you to attach your Canon EOS EF / EF-S SLR or DSLR camera to the prime focus of your telescope or spotting scope. This arrangement is used for terrestrial photography and short exposure lunar and planetary photography. It can also be used for long exposure deep-sky photography when using a separate guidescope.