Hi John 35, 28, The YN- 568EX are originally based on the Canon style flashes, which only zoom in 24 50 etc graduations. Canon Speedlite 320EX vs 430EX II: Which one is better? Start taking clear images and pick up your camera with confidence.
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This tutorial covers the methods I use for astrophotography with my Canon XSi digital SLR and Celestron CGEM. It is similar to the tutorial I wrote in December of for digital SLR astrophotography with my Canon 300D.