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Showing content with the highest reputation on 06/11/2019 in all areas

  1. 1 point
    The really expensive Asco loupes are achromats, the next level down (140 bucks) are aplanatic. As I've always understood, achromats are usually also aplanatic, so they deliver accurate color and an undistorted view across the lens. Aplanatic might have some color error. The color gets important when dealing with precious stones but isn't an issue for us watchmakers. I have several of both, and honestly can't tell which is in my hand without looking at the loupe body to see. In lower powers, the aplanatic issue is sort of a non-issue, as the simple single double convex lens delivers a good image. In higher powers it's almost a necessity that the loupe be a double lens design or there is awful distortion. Most good brands go to double lens groups (two single convex lenses) at around 10x. Seems like there used to be more offerings of double lens loupes in the 5x-ish range, I have a Wild Heerbrug 5x with double lenses and am pretty sure I have an old Asco or Bergeon or two lurking around here the same. I think all the current offering from the Swiss suppliers are good, you can't go wrong with Asco/Bergeon/Horotec.
  2. 1 point
    thanks for sharing this, very inspiring...
  3. 1 point

    roamer quartz

    As far as the winding stem, the Ranfft site shows them both as having the same stem :- http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA-ESA_955_412 http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&ETA-ESA_555_415 Not sure if the hight difference that you mention would be significant but I'd be inclined to give it a try. Sent from my moto g(6) play using Tapatalk
  4. 1 point

    Omega with plastic case back

    Hello Liam! Please let us know how did it work. I have a venus 170 missing the case back, and started to consider this option.
  5. 1 point

    Whats wrong with my Omega?

    Are the hands catching on each other or the crystal ? is it stopping in the same place
  6. 1 point

    Whats wrong with my Omega?

    Dose it repeat stoping at same hands position( time)? You probably removed hands altogether. Eliminate hands one at a time. When it stops, remove seconds hand only. if the fault has remained. remove the minute hand as well, if the fault remains, remove the hour hand. Dirty or faulty center tube, bent seconds hand, worn out center hole, dial plate center hole drift, so on.
  7. 1 point

    Whats wrong with my Omega?

    Potential problems. 1. Out of beat, could happen if the watch was dropped. 2. Mainspring not good. 3. Dirty. 4. Bent/damaged pivots or pivot jewels... I would take it back to the person who serviced it if the service was done recently. Good luck
  8. 1 point
    Eyes.. plural? Surely you just need one large eye for a loupe like that.
  9. 1 point
    Very thorough and detailed and great images for phone. Love that dial on your watch.
  10. 1 point

    Watch dial help for a student

    Thank you for your introduction and welcome to this friendly forum. You could google watches for the blind and take a look at some images, that would give you some idea. There are also watches that work on batteries, you press a button and it tells you the time, no hands needed. Don't forget if you use numbers or figures they need to be razed.
  11. 1 point

    Poljot 2415 cap jewel?

    Like to help . If i have the parts. But don't like the ones that always ask for parts. And not contributing to the forum. I ask for help sometimes and it's great to get some back. Scratch your back and you scratch mine
  12. 1 point
    To be fair (and not particularly helpful since the spring has already been removed) the trick is to not remove them in the first place. They are designed such that once the tail is free the whole spring can be hinged upwards, pivoting around the tips of the arms until the cap jewel can be slid out from underneath. Reinstallation of the cap jewel is simply the reverse sequence. Interestingly, these are not strictly shock absorbers, rather they are just retaining clips. The design of shock absorber settings is such as to allow the pivot to enter further into the setting under shock until a shoulder on the staff, which is much more substantial than the pivot, contacts the jewel and arrests the movement without damaging the delicate pivot. The spring then returns the staff to its operational position. If you look at the pivots of the wheels served by these settings you will find no such shoulder as the pivot is already substantial enough to withstand most knocks without ill effect. Also the springs flex only very little as a function of the mass of the wheel they support, unlike the shock protection set up on balance wheels where you have a comparatively large mass, a very fine pivot, and a lot of flex in the spring. That being said they probably do flex under extreme shock and as such may help to protect the pivot.
  13. 1 point

    Landeron 187 Chronograph problem

    Here is a pic.
  14. 1 point

    Omega with plastic case back

    Try using a claw crystal lift tool first. If you are lucky it may not have been glued in. Good luck.
  15. 1 point

    Omega with plastic case back

    just a cover to protect from dust,....original though...:)
  16. 1 point

    Omega with plastic case back

    They probably put it on with crystal cement and you will have to run a razor blade all around it until you get it to come off. Steve Sent from my iPad using Tapatalk Pro
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