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Author Topic: Lighted desk magnifier  (Read 579 times)

Sharyn

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Lighted desk magnifier
« on: June 06, 2021, 02:02:21 PM »
Just wondering if anyone has used a lighted desk magnifier at all i have trouble with head loops and i am thinking of buying one but i am not willing to hand over money if it is useless.
Cheers sharyn

Faceting Frank

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Re: Lighted desk magnifier
« Reply #1 on: June 06, 2021, 02:15:33 PM »
What power magnification are you wanting. I don't think any desk magnifiers I've seen come close to a number 5 lens Optivisor.

Sharyn

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Re: Lighted desk magnifier
« Reply #2 on: June 06, 2021, 02:26:26 PM »
Thats the problem. I would like around 10× but i cant find anything on line.
Cheers sharyn

Faceting Frank

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Re: Lighted desk magnifier
« Reply #3 on: June 06, 2021, 04:21:48 PM »
I bought a pair of jewelers spectacle magnifiers a few months back with 10x lenses thinking I could share the workload between two eyes, but you can't. The focal length of 10x is about 25mm from the object and you can't see it with both eyes.

Aussie Sapphire

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Re: Lighted desk magnifier
« Reply #4 on: June 06, 2021, 06:29:29 PM »
I bought a pair of jewelers spectacle magnifiers a few months back with 10x lenses thinking I could share the workload between two eyes, but you can't. The focal length of 10x is about 25mm from the object and you can't see it with both eyes.

That is exactly the issue.  All very well to want x10 magnification but no point in a magnifier that is intended to be some distance away from your eye.

Focal length is critical to consider when choosing a magnifier - the higher the magnification, the closer it needs to be to your eye.

For this reason, desktop magnifiers will not be that high in mag as focal length will dictate what works best.
Also consider depth of field.  Higher magnification means smaller depth of field so gems have to be held in exactly the right position to be in focus - lower magnification has larger depth of field so a bit more forgiving.

A standard x10 hand loupe is used with the loupe right up to your eye and holding the gem the appropriate distance away.  It just doesnt work in a desktop situation.

This info may help:






Remember that Donegan Optivisors will be labelled with their dioptre value - so a DA5 lens will have a dioptre value of 5 and magnification of approx x2.5.   Quite often we get people who are used to Donegan dioptre values ask for x10 but are actually confused what the numbers mean.  An optivisor number 10 lens is not x10 magnification but rather x3.5 times magnification.


Cheers
Leah

Aussie Sapphire - The Lapidary Warehouse

Buch Metter

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Re: Lighted desk magnifier
« Reply #5 on: June 06, 2021, 08:40:40 PM »
I think it is worth the time and effort to get accustomed to a head loupe, it will save you a lot of grief in the years to come, mainly because there are imperfections, meets, finishes that dominate your work and only a loupe will meet your demand.
Absinthe makes the heart grow fonder

Sharyn

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Re: Lighted desk magnifier
« Reply #6 on: June 07, 2021, 05:57:58 AM »
Thanks everyone. I will preserver with the head loop i have two so i will just see which is better.
Cheers sharyn

xcvator

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Re: Lighted desk magnifier
« Reply #7 on: June 07, 2021, 09:31:22 AM »
Another alternative that might work would be to have a camera focused on your work connected to a display monitor

 

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