Pentax AF160 on Canon 450D?

You can use it but be aware that it will only work on full power and might lead to overexposed pictures.

It has an auto mode, whereby the flash is responsible for deciding when to quench its output. The minimum working distance is 0.5m (green auto mode); maximum is 4m (red auto mode); and the maximum ISO is 400 (though a chart for higher ISOs could be produced).

If some exposure compensation is required, simply set a different aperture to the one suggested for the ISO, range and auto mode in the chart on the back of the flash unit.

I don't know how the camera will react to a non-eTTL "dumb" flash: it should be OK in Manual mode.
 
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