A different diaphragm

For the mystery abstract theme of today's Abstract Thursday challenge. Those of you who have this object will probably recognise it :-)

Just a close-up and converted to Cool Tones B&W in Nik SilverEfex

If you're entering the challenge too, please tag your entry AT134 and do tell me if your entry doesn't end up in the whole collection here. For example, my own entry here is properly tagged but hasn't appeared yet, neither the one of Hinden !

We've come through today's storm damage-free, thoughts with those who didn't, there was a moment when all trains were stopped and basically all traffic, including air traffic was deemed impossible, some of the videos of roofs, people, trucks, containers, portable loos being blown away are truly shocking. Unfortunately there are also fatalities due to the storm.

And glad to say that today I'm coughing a little less !

Thanks so much for all your kind comments, stars and even two hearts for yesterday's tulip !