Here it explains how to make an split dark slide:
http://www.largeformatphotography.in...ow-to-make-one
Straight, you mask one half of the sheet or the other, you have two shots in a sheet, with front or rear rise/fall you can center the half frame in the lens axis.
When you remove the 8x10 darkslide off the holder, before you shot you insert the split darkslide to mask the half you don't want to expose... and of course you replace the split slide by the original 8x10 darkslide before you remove the holder from the back
if not...
As you see, with an split darkslide you have it very easy...
Single problem is you make same development for both shots in the sheet, still you can cut the sheet in two halves before development to develop different times.
With the darkslide you don't need to but 4x10 holders, you don't need to cut 4x10 or to buy uncommon formats, you transport more shots with less weight and volume, and in the field you can choice the format.
4x10 holders are nedded only if you use a 4x10 camera.
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