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P.S.
The focal length of my mirror is f5.7.
It has a slight T.D.E. and a small hill in the middle.
I have tried Photographing to give me an idea of how
it is shaping but have found it very difficult to place the reflection.
I shall next try to use a small scope to look at the Mirror and if that fails
I shall have a go with making a Bath Interferometer
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