Sorry guys, but it's probably not a glass prism

Started Sep 5, 2007 | Discussions thread
OP David Kilpatrick Veteran Member • Posts: 5,436
Re: Sorry David, but it IS definately a glass prism!!

dkloi wrote:

I'm also slightly worried about the language they use
to describe the noise reduction, AA filter, and look of the image. It
could imply a fairly heavily smoothed image and I hope it isn't.

The bit about a 3 layer optical low pass filter did catch my eye.
They were touting reduced moire. I have found a patent which could be
relevant:

Abstract of WO2007083661
An infrared radiation is blocked by providing a coating layer (11)
comprising high-refractive index and low-refractive index layers
stacked alternately on a base material (10) in its light incident
face. One of the high-refractive index layers is formed of an ITO
film (11a) to enhance electroconductivity of the surface of the
coating layer. Preferably, the outermost high-refractive index layer
is formed of a transparent electroconductive material from the
viewpoint of imparting electroconductivity to the surface of the
coating layer to more reliably suppress the adherence of dust.
Further, preferably, the sum total of thicknesses of the refractive
index layers provided outside of the high-refractive index layer
formed of the transparent electroconductive material is not more than
140 nm.

I actually think it just means that the third layer (sandwiched in
between the other two) is the Indium Tin Oxide layer which they use
in the "anti-dust" system. Otherwise, it seems to be a conventional
IR filter/low pass filter.

As ever, Daniel, your patent detective work is valuable!

They seem to imply the three layers does more moiré reduction. I reckon their language is often not very carefully considered.

If I had been writing up what this camera can do, and what is its USP, I would have made far more of it than Sony appear to. They have the old Minolta hang-up of being obsessed with little unique details they are proud of, and missing the big picture in the process!

David

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