Measuring magnification

How to Measure magnification
How can I see how strong a magnifying glass is?


I bought this magnifying glass http://www.liangdianup.com/inventory/189901.htm and I want

to know how to test it to see how strong it is. I hear a lot of people talk about

magnifying and how strong the magnification is, but I would like to know the true

magnification of my magnifying glass. I have a few of them and some seem stronger then

others. How can I rate these? How can I pin a correct number on mine? How do the companies

that make these come up with these numbers.

hi,
don't know if i can give a good answer for you but will try...
for a giving size some with have a higher mag than others.... be that said.....

well i see that you have posted on another board..... and gotten answers.
http://www.opticstalk.com/forum_posts.asp?TID=13815&PID=147862
and they gave you answer unfortuately they ended up giving such a complicated answer it was useless to you. smiling....

but let say in more practical terms...
now first of all it all they generally will have it stamp on a glass.. but many times companies are too cheap.... with that link since they don't tellyou, so you write to them and find out what those values are...

now generally,,, for your 3-3.5" glass magnifications is going to be somewhere between 3x-5x !! the reason for it is that for such a small diameter... to get higher magnification would require a greater curvature and hence greater distortion!! ...

if some of your glasses are large than 3" then they can have greater magnification...... but it all goes back to how much curvature...

practically speaking.... you can do a visual.... you look at the the object and then use the glass and see what the percieved enlargement without too much distortion... basicall does it look like the image is 3 or 5x larger... otherwise you hit the books and the formulaes... smiling...

you might be interested in this articla
http://www.ppgift.com/about_us.htm

now if you know a eleglass place... you might talk to them as far if there a nice simple meathod you can use.... to measure...

well i know i wasn't much help i hope a little bit.....

hellogreen said:

How to Measure magnification
How can I see how strong a magnifying glass is?


I bought this magnifying glass http://www.liangdianup.com/inventory/189901.htm and I want

to know how to test it to see how strong it is. I hear a lot of people talk about

magnifying and how strong the magnification is, but I would like to know the true

magnification of my magnifying glass. I have a few of them and some seem stronger then

others. How can I rate these? How can I pin a correct number on mine? How do the companies

that make these come up with these numbers.