I have asked about the differences between 35mm and 4x5 scanning targets Wolf directly and here is part of his answer:
Mr Wolf:
"... As there is no difference between
the dyes used in the film between various formats, you can use the
35mm targets with medium format and large format films. Actually,
all targets except A3 are produced on 8x10" films wich are than cut
to the wanted size. Roll films have a rather nasty behaviour of not
being flat when scanned in some scanners. The large format films are
thicker... no problems with bending in 35mm frames.
...
The large format film targets are less affected by scanner flare.
They are individually measurement. Combined this can result in a very
small but visible difference in scanned colors. "
I guess I will go with 4x5 - large enough not to get lost :-)
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