If that lens has a fixed Minolta MD mount, there is no simple mechanical adapter possible which will allow infinity focus. There are MD to EOS adaopter which allow infinity focus, but they have optics in them which will (a) degrade image quality and (b) act as a weak multiplier making the effective focal length of the lens longer.

With the Spiratone lens it may be possible to remove the Minolta mount and replace it with something else, but I'm not familiar with the lens and I don't know how it is constructed or how the mount is attached. If it has the YS mount, then if you unscrew the Minolta MD part, it should screw into a T mount adapter for EOS. The stop down pin might have to be jammed in the stop down position to make the aperture adjustable.

You can find T mount adapters on ebay

See http://www.bobatkins.com/photography/eosfaq/manual_focus_EOS.html for more details on adapters in general.

T/T2 refer to "T mount"  a screw thread developed by Tamron so that their early lenses (late 50s) could be adapted to many different cameras. T2 is a slightly modified T mount to sllow additional adjustment.

M42 refers to the Pentax Screw Mount. It's very similar to the T mount (42mm diameter), but the thread pitch is different.

YS is very similar to the T mount system (same thread diameter and pitch), but adds a pin which is used to automatically stop the lens down when shooting. It's not very common. It's also sometimes known as a T3