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Thread: What magnifyer do you use over your glasses for soldering, etc?

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    Reading glasses are cheap and might be all you need for close up work; since you have piqued my interest, I have ordered a 6 diopter pair on ebay for $5 to try out.

    If one's eyes are not matched, one could purchase pairs of differing strength and then build ones own 'prescription'; round lenses have an advantage here.
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    Last edited by ashiekh; 06-28-2020 at 01:36 PM.

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    Quote Originally Posted by DWD1961 View Post
    I'm thinking about getting some of those clip on magnifiers to see how they work. I also don't want my focus length to be 3" either. lol.

    Finally got them (6 diopters); they focus around the theoretical 17cm (around 6 1/2"), so enough room to work in.
    Last edited by ashiekh; 07-27-2020 at 07:04 PM.

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    Quote Originally Posted by ashiekh View Post
    Finally got them (6 diopters); they focus around the theoretical 17cm (around 6 1/2"), so enough room to work in.
    Ah so you can use the most powerful at 6.5"?


    I just got this articulating magnifier lamp/arm:
    https://www.amazon.com/gp/product/B084SV2WK1

    It actually has a glass lens. lol. It's 5 diopter and it's focal point is about 6-7". So, it will work for soldering too! Plus it has a nice and bright built in lamp. It's not your industrial unit with aluminum knobs and things like that, but it will do.

    I still might try those lenses you got. I don't like having to pull around a lamp, really.
    Last edited by DWD1961; 07-28-2020 at 12:58 PM.

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    Quote Originally Posted by DWD1961 View Post
    Ah so you can use the most powerful at 6.5"?

    Seems to work well for a $5 solution.
    Last edited by ashiekh; 07-28-2020 at 10:35 AM.

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    Quote Originally Posted by ashiekh View Post
    Seems to work well for a $5 solution.
    Do you have a link to them? I would rather use those than a lamp, really.

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    ebay; search for

    "Black Oversized Computer Reader Round Reading Glasses +4.5 +5.0 +5.5 +6.0"

    There are actually cheaper versions but I thought these looked cool in a Kurt Gödel sort of way.
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    Last edited by ashiekh; 07-28-2020 at 03:36 PM.

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    Quote Originally Posted by ashiekh View Post
    ebay; search for

    "Black Oversized Computer Reader Round Reading Glasses +4.5 +5.0 +5.5 +6.0"

    There are actually cheaper versions but I thought these looked cool in a Kurt Gödel sort of way.
    Good picture! Thanks.

    You like them? I mean no distortions, etc?

    I need the type that just magnify by clipping to the lens because I need my prescription glasses too.

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    Very clear close-up, but don't go walking around the house with them on.


    Quote Originally Posted by ashiekh View Post
    If one's eyes are not matched, one could purchase pairs of differing strength and then build ones own 'prescription'; round lenses have an advantage here.
    You don't need to use your present glasses as you can construct a stand alone close-up pair tuned to your own prescription.

    Without proof (one can get this from the thin lens equation): The optical power of two close lenses is the sum of the powers of each lens.
    That means that you want the same diopter difference between left and right lenses as for your prescription; then you will have a pair that can be used alone.

    i.e. let's say your

    • left eye has a prescription of -2 diopters
    • right eye has a prescription of -0.5 diopters

    So if you pick +6 diopters for your right eye, then you would want +4.5 diopters for your left eye

    But if your prescription has both eyes the same, say your

    • left eye has a prescription of -2 diopters
    • right eye has a prescription of -2 diopters

    then you could pick +6 diopters for both lenses.


    For the same reason, the optician gets the reading prescription from the long distance prescription by just adding the same diopters for each eye (more for reading glasses, less for computer glasses). One might add +2.5 for reading (book at 0.4m) and maybe +1.5 for computer use (screen at 0.67m).

    If you can't be bothered to lookup your prescription https://www.glassesusa.com/scan/ will read the strength of your present glasses; this same place will let you go all the way to +9 diopters, but then you would only have 4 1/2" working space (but over 3 times magnification).

    DISCLAIMER: I am no optician and take no responsibility for the accuracy of any of the above; use at your own risk.

    P.S. Optical power and magnification are not the same thing.


    Perhaps you are right and getting a set of clip-ons is easier, but for me figuring out the above was an education; I'm still happy with my stand-alone +6 diopter glasses for $5
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    Last edited by ashiekh; 07-29-2020 at 10:24 AM.

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