I posted my last comment to the wrong section of the board (Filter) - what a newby - sorry....
I am new to Focus Stacking and am considering options re software. Helicon vs Zerene (already found that Photoshop CC 2014 has issues with stacking). A big issue for me is that Helicon only saves to lossy .jpg format. It can process a number of formats but it can only save to the least preferable format (in my mind). I have read that Helicon deals with halo better and so the choice is not easy.
Is there a way to save to .tif or .dng? Is it an upcoming update?