Flashes per second when focus stacking.

[Sandro_gsp]

For a normal macro focus stacking session, I usually shoot about 50 Raf files, to be later processed in order to create the final image.

This is fine when I'm outside with plenty of light, but indoor I must use a flash.

With electronic shutter my camera is able to reach 20 fps in Raw mode , 15 when using mechanical shutter.

IMO this means that when focus stacking  my flash should be able to provide at least 15 flashes per second, all of them with constant power.

Almost impossible.

Alternatively , I would like to be able to set a delay from 1 shot to another.  But unfortunately in the settings I can only specify 0 seconds delay, or 1, or 2, or 3 ..... and so on.

No way to set -say- 1/4 of a second. ( to get 4 Raw files per second, instead of 15) .
 

How do you guy manage to solve the problem ?

Edited October 28 by Sandro_gsp

[pw-pix]

I'm pretty sure that typical macro flash use is at quite low power settings and the flash has no trouble keeping up with higher frame rates. Often a diffuser like the Cygnustech is used and this maximises the use of the light on the subject too.

Have a look at this video from Naturefold