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Dumb question of the month.

CYGNUS-X1

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CYGNUS-X1

CYGNUS-X1

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Erecting Prism and Star Diagonal .........

Excuse me for being a thicko....but, I thought that erecting prism's and star diagonals were 2 different things?

I am probably wrong....as usual........ but I keep seeing adverts saying "90º Erecting Prism Star Diagonal "

Could someone please enlighten me.....;)

Paul .:p

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