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TomGW
路Have you tried on the Mk IV before? Is quite bulky and heavy, a bit more than the Mk II, and quite a lot more than the Speedmaster Professional (Moonwatch).
Omega Speedmaster Mark IV - 176.009 Need help deciding.
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TNTwatch
路I have both the MKii and MKiv and don't notice much difference between them in terms of size or weight. The MKiv has a raised bezel, which is the main difference in shape and size. Are you sure you're not thinking of the MKiii, as it's a bit of a brute?
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Lonestar
路Just thought a few minutes about the pulseometer thing yesterday... actually simple maths can help use a tacho as a pulseo... Same concept, you time a fixed metric, and convert. The conversion ratio is the key 馃榾
So time 12 beats on your "patient", read the tacho speed (must be on a km/h basis like most speedies), divide by 5 (easy... divide by 10 as all writings are multiples of 10, then multiply by 2...) and voila, you have your bpm.
example:12 beats take 17 seconds, read 220km/h, divide by 10, 22, multiply by 2, 44, voila, 44bpm
(check: bpm = 60/17*12=42.3bpm, close enough, same uncertainty as when ready a pulso anyway)
Voila.
Otherwise you can buy a proper bezel, too 馃榿
So time 12 beats on your "patient", read the tacho speed (must be on a km/h basis like most speedies), divide by 5 (easy... divide by 10 as all writings are multiples of 10, then multiply by 2...) and voila, you have your bpm.
example:12 beats take 17 seconds, read 220km/h, divide by 10, 22, multiply by 2, 44, voila, 44bpm
(check: bpm = 60/17*12=42.3bpm, close enough, same uncertainty as when ready a pulso anyway)
Voila.
Otherwise you can buy a proper bezel, too 馃榿
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TomGW
路Of course it's not really km/h or mph, or any other specific unit. It's just that 16.364 secs occurs 220 times in any hour, so all Tachy bezels are the same.
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Lonestar
路you are correct, brain fade here, what matters is timing something "per minute"
(which my dumb brain inevitably associated with "per hour", then by another f'ed-up piece of logic, "kilometers per hour"... thanks 馃槈 )
(which my dumb brain inevitably associated with "per hour", then by another f'ed-up piece of logic, "kilometers per hour"... thanks 馃槈 )
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TomGW
路you are correct, brain fade here, what matters is timing something "per minute"
(which my dumb brain inevitably associated with "per hour", then by another f'ed-up piece of logic, "kilometers per hour"... thanks 馃槈 )
@TNTwatch
Yeah, the Tachy scale is just fractions of an hour, so timing a single occurrence of literally anything at all can be translated directly as 220, or, 90, or whatever, per hour. Dividing by 60 will therefore give you the per minute rate, or in the above example divide by 5, as you have already lumped 12 occurrences together as one unit.
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TNTwatch
路@TNTwatch
Yeah, the Tachy scale is just fractions of an hour, so timing a single occurrence of literally anything at all can be translated directly as 220, or, 90, or whatever, per hour. Dividing by 60 will therefore give you the per minute rate, or in the above example divide by 5, as you have already lumped 12 occurrences together as one unit.
Edited:
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Andy K
路Wearing mine today. Like the one you were considering it had a complete Omega spa treatment around 2009-2010. As you can see the case has been restored nicely and the dial was swapped out with the service dial.
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gravel54
路Thank you all for your input!
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