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Fabulous image Martin.
I take it the lens has an electronic aperture? Some older lenses like Nikon have a little tab that slides on the mount to open/close the aperture. You can fix it in place with a tooth pick or similar. But a modern lens with electronic aperture probably can't unless you put it on your DSLR, set it to a particular aperture then turn the camera off but the lens may default on power off to wide open - but worth a try?
Stop down rings are better though as they don't create sunstars out of every bright star.
Greg.
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