Scanners for 4x5" comparison

[Pierre Kervella]

I have added a section on the Dynamical range, Dmax and Dmin of my two current scanners, the D2400UF and the FS2710, both from Canon. You are kindly invited to visit this web page :-).

The adress is the same as before (see above). There is a BIG surprise from the D2400UF ! :-)

[Pierre Kervella]

The direct adress to the new page is:

http://elb ereth.obspm.fr/~kervella/Scanners/dmax.htm

[Pierre Kervella]

I have completed my series of tests with the measurement of the modulation transfer function (MTF) of the Canoscan D240UF. Its resolution is really 2400 dpi for a modulation of 50%, and it is probably even higher optically but limited by the detector sampling.

There is also a paragraph on a suggested "optimal unsharp masking" procedure for this scanner, considering its MTF.

All comments will be appreciated :-).

[Baxter Bradford]

Thanks for all of your work Pierre.

I too have an Epson 1200 Photo and have struggled for sharpness. Noticing a distinct improvement the larger my neg size.

I now struggle with Newtons rings with 4x5 B+W negs (and some colour). Am experimenting with making some new neg holders and working out how to tension the neg to prevent the sag. Blu-tack is am obvious, but inelegant candidate.

Are the neg holders any better with the Canon. I'm very impressed with the performance.

[Pierre Kervella]

The film holders of the D2400UF are in my opinion very well designed. The film is not touching at all the scanner window, and I have never seen Newton rings even on 4x5". I suppose this is one of the most important parameters to have good quality scanning.

With my previous Epson Perfection 1200 Photo, the Newton rings were really a nightmare, even with medium format film.