I saw a poster on another forum post a very cool photo using a one second exposure. So, it got me to thinking about my Deville co-axials. By the way, I am no master of Photoshop -- so what you see is pretty much what the camera captured. It was a very enjoyable experience to play around like this.

You may know there is a calibre 2500B and 2500C, which differed in the B version being 8 beats per second/28,800 and the C being 7 beats a second/25,200.

The Deville above is a 2500B and runs at 8 beats a second, which you can see at higher magnification.

A half second exposure is a little easier to see:

I like this one, but should have cleaned the watch better!!

Next I tried to get my Deville GMT, which has a 2628C, running at 7 beats a second/25,200 and the Deville above set to the same time and get a photo of both second hands with a one second exposure.

Another shot

Close ups of each hand, 7 beat 2628C GMT on left, 8 beat 2500B on the right

Before moving on, I just loved the lighting on the blued second hand on the 2500B

So, what about chronographs?

5 beat a second/18,000 1940s Lusserna, with a Lemania equivalent of Omega calibre 321

Another vintage, a Dubey & Schaldenbrand, index-mobile rattrapante, based on a 5 beat per second/18,000 Landeron chronograph movement

Modern chronographs have a faster beat -- 6 beats a second/21,600 Snoopy Speedy Pro

Says something about the visibility of the Speedy dial -- this was far and away the easiest to photograph.

The beat doesn't seem even on this one does it? I'll have to check another Speedy and see if it is a characteristic of the 1861 to beat like that.

Here's an 861 in a Speedy Mark II

Hmmm, the Snoopy may need some work -- what do you think?

A contemporary of the Mark II, the Speedy 125 had the 8 beat a second/28,800 calibre 1041.

Our final chronograph for today -- the Speedmaster Split Seconds, with the same beat of 8 per second/28,800

Sam aka Hewybaby