EOS R6 Mark II stops well short of focus bracketing image count

[DannyC71]

I have an R6 mark ii and have an EF 35-80 macro lens. I was trying some focus bracketing to make a focus stack. I set it for 150 images at the smallest increment. On the first try it only took 20 something images before it stopped, and on the second attempt only 65 images. Would this have to do with the capability of the lens seeing as how it’s an older EF lens? I can’t imagine I’d be up against the buffer like if I was shooting high speed + or something like that.

[p4pictures · Accepted solution]

Your lens is not compatible with focus bracketing, as only a few EF lenses are. 
The list of compatible lenses is on the Canon website

 https://cam.start.canon/en/H001/supplement_0010.html 

However if the lens took a series of images, it is possible that it reached infinity focus and at that point there's no value in taking the remaining 100s of pictures if they will be the same. Most of the time you won't need hundreds of images to make a focus stack.

[DannyC71]

I had a feeling it was the lens, thank you!