question on focus merge

[srg]

Hi, I use a lot the phocus merge in AP to get dept of focus. Now my question is if it is better, for my purpose, to use a small F (example F4) with smaller (more) focus increments  or a large F (example F11). 

Furthermore is there a limit or optimal number of the shots that can be merged?

Thank you.

 

[John Rostron]

8 hours ago, srg said:

Now my question is if it is better, for my purpose, to use a small F (example F4) with smaller (more) focus increments  or a large F (example F11).

Most lenses have what they call a 'sweet spot' that gives the best resolution as a compromise between depth of field and diffraction. It is typically around f/5.6 or f/8. You really need to try your own lens and see.

8 hours ago, srg said:

Furthermore is there a limit or optimal number of the shots that can be merged?

There is no theoretical limit, but unless you are doing micro or extreme macro stacking, then 10-20 should be adequate at the sweet spot.

John

[srg]

Thanks