Hi Izzie,
No, absolutely not.
I
really looked forward to your post this week, got a cup of coffee and sat down to write the response when I had time to do it justice, as I have in previous weeks, often being late to the party. I try not to read others replies as it sometimes makes my brain 'switch off' rather than properly analyse the shots, so apologies for mention ProPhoto again (but that's gonna happen from time to time), just ignore me on these points if already addressed.
After I had replied, I was definitely not feeling disappointed, quite the opposite - you had taken on board so much of what we'd all contributed last week, perhaps I didn't make that clear enough.
These are NOT a disaster!
You do need to give yourself time (and energy) to do a good job though, I usually work to the principle of a job being done properly (if a little late) is better than being on time, but rushed and quality suffering for it.
I completely missed that these were focus stacked, the EXIF doesn't say (AFAIK).
I don't focus stack, but am wondering if there is a technical flaw in your method (as I wouldn't know), or simply whether tiredness caused the problem this time.
Focus stacking should achieve better DoF than a single image, as long as you ensure that you have an image with the nearest part of subject sharp, plus a similar one of the furthest part of the subject sharp, then a number of shots between them - the number required being determined by the physical distance between nearest and furthest parts and the DoF of the aperture used.
e.g.
nearest shot at say; 10 inches (DoF for 105mm at f/16 on D810 = 0.16")
furthest shot at say; 12 inches (DoF for 105mm at f/16 on D810 = 0.24")
rough calculation by averaging those comes to about 0.2", so that's 10 shots for 2" (12-10), but the DoF on first and last shot is only half the figure, we'll add another one making 11, then (personally), I'd add another 'for luck', making 12 to fill the gap, and 14 shots in total.
I assume we should shoot them sequentially from nearest to furthest (not first, last, then fill the gap).
As I said, I haven't ever stacked in PS, so I can't comment on a sensible or bad methods of stacking 14 shots, but my instinct suggests do them all in one go, having shot them in a numbered sequence, to avoid possible slip ups or compounding artefacts (not that I saw any obvious ones, or I'd have guessed you had stacked).
Now that I have 'done the math' with a DoF calculator for this reply and seen how thin the DoF is for you, it becomes blindingly obvious that these were stacked (Dave smacks his head), so either you didn't have sufficient range, or perhaps gaps appeared in the coverage due to the multi-pass combining process and tiredness. It sounds like you did take enough for coverage though.
Yes, this should be fun, if it's not, ease the pressure on yourself.
You have made good progress, please don't be despondent,
be proud.
It is only natural, if concentrating hard on one aspect of a shoot, to overlook other areas, with more practice, it will all come together eventually.
Keep it up (
but only if you enjoy it), Dave