Hi Jon,
I often read the contributions here but rarely contribute, not usually having much to say, but here I do have a little experience!
As far as I know, you can't actually focus stack in Lightroom (although I admit I rarely use this), but one can send images from Lightroom
to Photoshop, where you can stack them.? I use Photoshop almost exclusively, and focus stacking is really easy.? From Bridge (my preferred
method), you select the images to stack, then go to Tools>Photoshop>Load Images into Photoshop Layers.? I guess if you're using Lightoom,
there is a similar method for sending images to PS?? Then, select all the layers in the Layers palette and go to Edit>Auto-Align Layers.
Next, with the layers still selected, go to Edit>Auto-Blend Layers.? Then go and have a cup of coffee, especially if you have lots of layers!
And that's it.? Provided your focus stack is good - move the focus stage in only very small increments - Photoshop actually does a very good
job of stacking.? You will need to flatten the image before you can save it, especially if you have many layers and a high-pixel-count camera!
I have also used other freebies such as the various flavours of CombineZ in the past, but I've always had much greater success with the
current versions of PS CC.
There are lots of tutorials on YouTube, btw!
Good luck and best wishes
Chris
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Chris Gibbins