doing that will result in a reel that is too big to fit in the smaller 2520 tank, thus must be used in the larger 2550 tank, and will require a min of 800ml or so. Assuming you could possibly load 6 sheets vertically on this reel, there will be nothing to keep the film from buckling and collapsing onto each other, thus leaving only the option to load them horizontally, meaning you could only load 3 sheets, but that does not even begin to consider the amount of modification to the reel channels to accept a sheet longer then 5 inches.
We did this when we designed the
CL81, and we did consider 5X7, there was just no placement for it. There is no direct fitting tank, and no standard feel that could have been used. The cost of R&D and bringing it to market only bearly paid for itself as the market is fairly small. It is possible that 5X7 is even a smaller market, being the "forgotten format" as my RIT professor used to say. Even if it were the same, the fact there is no tank to fit it and high "waste/cost" that would result from using a too large a tank would be, a least in my eyes a non viable project.
In short, as the 3006 drum is readily available and works beautifully, there is just no reason to spend that much energy on this project which does not have a compatible tank to match.
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