focus stacking

So, yesterday I got a RRS catalog in the mail. It had a rather extensive section on macro shooting, including the instructions for how to focus stack pics so you could get the entire subject in focus, which can be a big deal with macro shots.

So a bit ago I'm thinking that this should work with a normal shot to isolate the background by using a large aperture and stacking shots. So I gave it a try. Since it was a quicky test I only took four shots, but it does prove the concept.

This is four shots with a Pentax SMC Takumar 55/1.8 @ f/1.8 taken from the minimum focus distance of the lens ( ~18" ). Please note there is no inherent artistry to the shot, it's a proof of concept thing.  

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At that aperture/subject distance the DOF is 4.3mm according to DOF Master (iPad app) so you'd need a bunch more shots to actually get the whole flower in focus. Interesting exercise.

Now I have to go find my macro rail...

 

I can see uses for the concept, especially for static subjects where you have to be close the subject and still want to isolate it from the background. Might be a little tough in the wild outdoors trying to contend with wind etc. though.