If any of you are like me and have not the greatest eyesight it's difficult to focus sometimes. I was wondering what's the best way you guys can get a shot in perfect focus?

What I've been doing is i put the camera in manual, because I'm never satisfied with auto-focus, use the live view on my D90 and zoom in on the screen as much as it will go and focus my center of focus point and take 3 shots in a row, one under-focused, one where I think focused is, and one over focused.

I have gotten some pretty decent pics this way but was wondering if there's a better way of doing it?

Here's a few shots I've taken
5 lined Skink (during a cloudy day)

and my cat inside

Thanks
Zack
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Zack Greens Reptiles