Assumes you are using both holders and film. For those of us processing one sheet at a time the tank can hold a little more and might make a difference on the top edge if you miss it. Depending which versions of the holders you have there may be more/less displacement of volume. I usually mix 500ml and pour in until I see it break the venting hole while squeezing the tank, and have only a few drops left in my mixing vessel.
The magic you are looking for is in the work you are avoiding.
http://www.searing.photography
Esearing has a good point.
If you're only using one holder, be sure to fill to the "450ml tab" (it will take about 480ml).
Personally, I always fill to the "vent hole" because it's easier to see.
Ian,
I leave out the unloaded holder but it really shouldn't matter.
Tim
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