Make a ID stick from a tongue depressor with a 0 on one end, a 5 on the other end flip it over and put a 10 on one end and 15 on the other. Coat it with epoxy and put it on a string attached to your rig. When you have finished taking some pictures take a picture of the proper end of the tongue depressor corresponding with the diopter just used. Then you will know that the previous pictures were taken with a (XX) diopter.
It will be easier to do this after the pictures as opposed to before the picture. You will have to make this a habit to work.
The other option is to put the proper ID end of the tongue depressor in each shot and crop it out later.
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