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Dieter, thank you for your reply and explnations.
The image was for recognition puposes only; my attempts at photography were with the lens mounted with varoius combinations.
With the lens in place, and off Manual, a message is displayed, "No lens mounted".
Once put into manual the message goes away.
So far so good!
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My initial attempts went as follows:
Looking through the eyepiece, one can observe any subject, and one can adjust for focus accordingly.
The red focussing dots are working.
I believed that the mirror was not moving because the image is absolutely a solid black rectangle.
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Following your instructions:
I set the ring to 4.5
switched on flash (just in case)
I cannot see a way to remove the extender (physically off the body) so I retracted it as far as it could be, and spun it round to 1:1, the minimal setting.
I snapped, and found that the camera recorded an image.
voila!
now I will experiment with the old lens, as it is clear my initial assumption was flawed.
Thank you very much for assistance.
Best Regards,
Cyril