20D - improved Katz Eye focsuing screen - Part 1/1

Started Aug 13, 2005 | Discussions thread
haoda Regular Member • Posts: 149
Can you tell us what raw material do you use?

As far as I know, all of the aftermark split image focusing
screen on DSLR are modified screen. No one have the
injection molds for their screens.

The following words are said by Rachael

"Canon has the luxury of making injection molds for their screens... and those molds cost in excess of $100,000 to make. But once they have the molds, their per part cost is litterally just a few pennies. So when you work the math, they can sell them pretty cheap and still make a lot of profit. On the other hand, I have to do all the R&D, set up a small semi-automated production line, and machine them in small batches from sheet material - a considerably more expensive process."

So basic idea for ALL of those screens are cutting 35mm screens
to proper size to fit 20D or other camera.
As far as I know, all of the split image focusing screen will have the
f/5.6 or f/6.3 optical limitation. This problem has been exist from
the split image apear.

The question is you only modify the screen how come this
can be better than the original Canon focusing screen, like
Canon Ec-B.

Best,
Haoda

Haoda Fu
Haoda Split Image Focusing Screen On Canon DSLR
http://groups.yahoo.com/group/screen4DSLR/

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