Over the years I have seen so many questions floating about regarding how high the negative has to be above the scanner glass for max sharpness.
I have been thinking about this for some time.
Scanner lens
We know that the Epson Vx has two types of lens, one so called Low Resolution used for scanning directly off the scanner glass and one so called High Resolution lens which is used when scanning from a film holder. The High Resolution Lens only scans an area of 9.7 x 5.7 ins.
No Auto Focus
We know that the Epson has no auto focus and by moving the negative closer or further away from the lens is going to affect the focus.
Adjusting The Film Holder
Epson supplied film holders can be adjusted up or down slightly to move the negative closer or further away from the lens.
Third Party holders such as Better Scanning Holders also have an option to adjust the holders height which in effect moves the negative closer or further away
People have come up with all sorts of heights which claim to be the optimal height for max sharpness.
Epson Fluid Mount Holder
Epson also offer what they call a Fluid Mount Holder which allows you to wet scan the negative.
The holder is of a fixed height which when I measured mine roughly places the negative 3mm above the scanner glass and has no adjusting options.
This leads me to this question ...
If the fluid holder has no adjusting options, doesn't this mean that the holder during design is optimised for the correct height so therefore why have the option to adjust the non fluid holders.
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