This is an old low powered ring flash which needs to be used with manually set exposures. It reportedly doesn't produce voltage spikes that damage digital SLR's and I have used one with a Pentax K10D and Tamron SP90 macro lens successfully for 9 years for dental photography until I dropped it! This is the replacement and is a good option if the limited power and lack of automatic control are not a problem. The new alternative options retail for above £300 but do have automatic exposure and more power.