Ok - sounds silly I know but, it seems that different cameras use different techniques for performing auto-focus. For example, my D70s and Olympus 2100UZ can focus very well through glass (like a fish tank). But.... My friend has a Canon Powershot A95 (I think?) (This is not a Canon Bashing thread - OK?:smile: ) but with his camera it is very hard to get it to focus through the glass. The point is here, I guess different camera's use different techniques to perform auto-focus? Perhaps P&S cameras use a less expensive focus technique than DSLRs? I do not know much on the different techniques available for digital camera focusing mechanisms and if someone can shed some light what the various methods that are used for auto-focus and perhaps a work-around so he can use it to take fish/coral photographs. I am making any sense here?