Jump to content

Magnifying visors: eyes crossed!


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 comment
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 comment
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:

hengshandajie280hao

yuanshixian

shijiazhuangshi

hebeisheng

050000

CN

 

Link to comment
Share on other sites

  • 2 years later...

I took the plunge and ordered a Donegan Optivisor from Cousins - I also got the loupe thing that goes with it in a mad moment of buying frenzy! I now have a little buyers remorse, does anyone have any experience with the loupe thing.... did I just waste my cash 😟

Here is what I am talking about:

image.png.279ae50cc7d42e7c021664f55650a829.png

Link to comment
Share on other sites

I have one of these.

I use reading glasses 1.5 and the two lenses 2.5 and 3.5 for normal work. I use the loupe for fine work. So that I can see effectively, I have inserted a black piece of board in-between the lenses that allow the view for the left eye. Using the sight of my right eye means I do not have double vision.

https://www.ebay.co.uk/itm/404167874198?hash=item5e1a485696:g:z-YAAOSwv-5j7z1i&amdata=enc%3AAQAIAAAA8IlOhxI4B%2F26Yd0W8vnK2aD3GEdV%2BiCMWZPHKqmkctk%2Bt72pJFk54kEWB8pzOlQaElcpEK%2BilKp%2BvAufAL5hTNHm4xfLb2wlc%2BnD8IRPbkCZarYKMP7wt1y9X2ZTtdzX9JXIdnWdCQH9NOUPCpIEigCt9yQAbXMjU485159Pck8OZB0iZ9PaWKH97T%2Bf1NOZy%2FV9MWZly9KhT%2B9jxK9nBuKNhI%2BGb8hJkUJS0HUbanSVgUJVEoZtH0QvXhuW6N6qIhNBnc0lZXkqiFGzztMiCQEIBBo6qSOPbUxt6mBOFlUkvk007AxTrEOVEUx6xGyu2w%3D%3D|tkp%3ABk9SR9rDodTwYQ

Edited by rossjackson01
grammar. spelling.
Link to comment
Share on other sites

6 hours ago, spectre6000 said:

I've tried a few (3) different optivisors now, and none of them worked for me even a little. I stepped up to a stereo microscope and THAT is the ticket.

Me neither, the lenses on my visor make me feel woosey. I use +4 reading specs, sometimes through a bench magnifying glass for genral work then a couple of scopes for more detailed work.

Link to comment
Share on other sites

On 4/27/2023 at 12:42 PM, Waggy said:

I took the plunge and ordered a Donegan Optivisor from Cousins - I also got the loupe thing that goes with it in a mad moment of buying frenzy! I now have a little buyers remorse, does anyone have any experience with the loupe thing.... did I just waste my cash 😟

Here is what I am talking about:

image.png.279ae50cc7d42e7c021664f55650a829.png

My optivisor has arrived and I've tried it on and it's much lighter than my previous one, but I haven't tried it for a prolonged time yet as I am changing my workshop configuration and it's in no condition to do a watch at the moment. Will give full feedback when I've given it a real try. I used a visor almost from day 1, so I suppose I am used to it, but my previous one had lights on it, which seemed like a great idea, but after an hour+++ of wearing it the weight from the light and batteries felt like I was wearing a housebrick on my head, so hopefully this much lighter version will be much less fatiguing over prolonged use.

Link to comment
Share on other sites

Scott

I wear the housebrick (Magnifying Glass Loupe LED Light Adjustable Headband Visor Magnifier Loupe - 3rd reply above).  For me though, many is the time I do not notice having it on. I put in on just after I have placed the watch in my component tray in the working box. I always use the LED, relying on rechargeable batteries.

I think my head is thicker than yours. No headaches. Except for trying to get better amplitude.

Edited by rossjackson01
more information
  • Like 1
  • Haha 1
Link to comment
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.

Guest
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

    • These are the places where I oiled with HP 1300...  These are the places where I oiled with HP 1300...  I can see that the cannon pinion is moving as it should once I installed the pallet fork. I created a small video but was not able to upload it. It is a mov file type. I need now to source a GR4014X mainspring, a stop ever #9433 and both calendar disc as the days/dates are peeling out... This is the mido watch which holds the ETA Movement.... I just want to thanks all of you guys for your help, specially @eccentric59 who nailed it! So, I would consider this case as closed unless of course any question from any of you... Best regards Fernando     I could not download the file... I will tray to located. Many thanks. 
    • Thanks a lot everyone!  I'll update you as soon as a final decision has been made by my friend (and depending on her decision, what I may find inside). 
    • Thanks Marc, clearly I have a lot to learn about metallurgy. I’d expect the cutting of tool or spring steel to be a lot harder to cut into a precise shape- I expect I’d have to anneal it first? 
    • Unfortunately if you have used mild steel you will have little hope of hardening and tempering it, it simply doesn't contain enough carbon. You need to use a steel with a higher carbon content like tool steel or spring steel. One good source for this is engineers feeler gauges which can be picked up relatively inexpensively and provide a range of thicknesses of material. this will then harden and temper in pretty much the way you have described.
    • Thanks for this excellent tutorial and very fine illustrations @Jon! Really first class! 👍 I noticed that your image was a bit too small to read with ease, so here's a larger copy of it. I summarized @nickelsilver's method for adjusting beat errors to the following, but you can find all the info in the thread I linked to: “For everyday work, from the smallest ladies’ movements to marine chronometer, I set the balance with the cock on a bench block so the roller table is in a hole, balance on the block. Lift up the cock and move it over- not flipping it, just moving laterally, until I can see the slot in the hairspring collet, get in there and adjust (for tiny watches this is usually with an oiler, larger, a small screwdriver). Go back in the watch and check on the machine. I hold a balance arm of the rim with tweezers while moving the collet.”    
×
×
  • Create New...