Jump to content

Recommended Posts

16 hours ago, HectorLooi said:

Ok. I understand now. That "toe-in" angle is called the convergence angle.

The visor loupe that I have has a built in convergence angle. Even though the two lenses appear flat, if you look at the left and right edges of the lens, they are thicker than the middle where the lenses meet.

But then, with a simple, non-adjustable setup like this, it doesn't suit everyone. If you are lucky and the distance between  your eyes (inter pupillary distance) is the same as that of the visor, then all is good.

Even if you get an expensive surgical binocular loupe, you have to adjust the inter pupillary distance to suit you. And in my case, even the convergence angle didn't suit me. After using it for five years, squinting through slightly skewed lenses, I decided to do what the factory warned against doing. I loosened the lock screws and set my own convergence angle. And I have been using them for the last fifteen years.

Thanks for filling the gap in my vocabulary. The visor I got has no convergence angle. I imagine you're meant to adjust the pupilary distance by moving the lens set in/out, but with no angle at all, no amount of in/out will get the job done.

Link to post
Share on other sites

I had a cheap Chinese made visor before I had to wear glasses.  It was never any good.  I got a Donegan Optivisor and it is worlds better.  It gets a little weird with progressive lenses in my glasses but I have it figured out now.  I don't know how they correct for pupil distance and convergence but they do.  It's their secret sauce. 

An Optivisor that ships from China is going to be a cheap fake.  Find a source for the true Made In USA one. 

Link to post
Share on other sites

Yeah. It was sold as genuine, and I didn't have any reason to suspect otherwise until I got the tracking number. I'll be in contact with Donegan and Amazon once it arrives.

Link to post
Share on other sites

I saw Donegan on Amazon and it shows that it ships from China. If you look at the seller detail you find this, very suspicious. I’m buying mine from Esslinger. It costs more but at least you know what you’re getting.

Business Name:shijiazhuangqiamiaoshangmaoyouxiangongsi

Business Address:








Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing

    No registered users viewing this page.

  • Topics

  • Posts

    • Just so I understand clearly first it's an hour off then you reposition the hands it's one half hour off? As it's the calendar parts shall have to take the hands and dial off and see what's going on. Then it's hard to go beyond this because which movement is this? But we could guess if the hands are actually tracking it's probably not a Canon opinion the problem perhaps. That takes us back to something to do with the the calendar parts which are under the dial unfortunately. Then we can't even look for a tech sheet if one even exists without a movement identification. But more likely have the watch hasn't been serviced in a long time that needs to be done.
    • Just in case your part doesn't work the last link has one. Big part of the problem might be for people identify the watch perhaps. It actually goes by several different names. Then as far as I can tell from looking at bestfit online and the Site below there's only one set bridge. I snipped some images out of the physical bestfit book at one time there was what was called the fingerprint system used to setting parts to identify your watch. In this case will use it to see what your parts are supposed to look like. Unfortunately the snipped images won't print out the correct size but at least you can look at the shape and see if it matches.. The second link has a listing of all the parts. The third listing  which watches have your set bridge and its and the last listing in case you want to buy one it looks like they have it in stock. http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Langendorf_1305 http://cgi.julesborel.com/cgi-bin/matcgi2?ref=LNG_1305 http://cgi.julesborel.com/cgi-bin/matcgi2?ref=X`_DZLU http://www.julesborel.com/s.nl/it.A/id.57704/.f  
    • Hi everyone and hope everyone is OK. bought this watch in a joblot for a tenner (£10.00) so no complaints. The watch works fine but the date changes an hour forward every 24 hours. So if I cycle through the watch and it changes at 12, the next cycle it will be 1am, the next 2am etc. I also removed the hands, cycled the watch to the precise time of date change and then replaced the hands at the 12 O'clock position but the date started to change at the half past position with the same problem as above. The hands sit fine and are snug. Any ideas on what is going on? Many thanks and kind regards. Pedro.
    • Not very much out there for this one, but here is a nice page. with a leaflet. https://eterna-fanatic.com/calibre-1406-1407/
    • hey Also any one got any work , parts sheets for the eterna 1406u cheers gary
  • Create New...