Does anyone here have a dome/paperweight magnifier they could try an experiment for me?

BAC1967 · Mar 17, 2020

jsmoove said:
@BAC1967 So you were saying that the distance between the bottom(flat side) of the magnifier and the paper was 4cm then? https://imgur.com/a/udQJOO6

Basically, my goal is https://imgur.com/a/bgKv17G where the image would be in focus in this scenario. With the thickness of the lens is less than the minimum phone distance of the phone. (6cm)
I am unclear what type of lens I need to accomplish this..

I was measuring to the camera lens.

jsmoove · Mar 17, 2020

@BAC1967 How thick is the condenser lens? Or what is the distance between the bottom of the condenser and the newsprint?

BAC1967 · Mar 17, 2020

jsmoove said:
@BAC1967 How thick is the condenser lens? Or what is the distance between the bottom of the condenser and the newsprint?

The condenser lens is about 2 centimeters thick.

jsmoove · Mar 17, 2020

@BAC1967 So do I have it correct that there is then 2cm between the bottom of the condenser and the newsprint?
And if the condenser had an extra 2cm of glass you could do this https://imgur.com/a/bgKv17G to have the image in focus
Sorry to ask so many questions,
and the diameter of the condenser is?

BAC1967 · Mar 17, 2020

jsmoove said:
@BAC1967 So do I have it correct that there is then 2cm between the bottom of the condenser and the newsprint?
And if the condenser had an extra 2cm of glass you could do this https://imgur.com/a/bgKv17G to have the image in focus
Sorry to ask so many questions,
and the diameter of the condenser is?

That’s about right if my measurements are accurate. Unless you get the exact same condenser lens you will probably get different results. The condenser lens is 5 centimeters in diameter.

jsmoove · Mar 18, 2020

@AgX I'm not sure I understand the formula..I don't know alot about optics to be honest.
I'm wondering if there is a "range" of dome magnifiers I can look for/buy online to work in this exact situation: https://imgur.com/a/bgKv17G
Where the black is the thing I want in focus.
Ideally I was looking for something between 20-30mm in diameter, and I know most of the mobile phones seem to have a minimum focus distance of around 6 to 8cm.
Is there a way to go from there? Most of the dome magnifiers online mention their magnification and diameter, their thickness too, but not always their diopter.

jsmoove · Mar 18, 2020

@BAC1967 It seems that it needs to have an elongated thickness to achieve the phone/magnifier/object sandwich I want, im just not sure if that means regardless of diameter it would always need an additional thickness added on, or if I can find a dome magnifier or condenser in the wild that would actually work without this modification. Appreciate the help, and the pics!

AgX · Mar 18, 2020

jsmoove said:
@AgX I'm not sure I understand the formula..I don't know alot about optics to be honest.

That is why I advice you to tudy some textbook to base any further experiments on.

jsmoove · Mar 20, 2020

@AgX I think I just need to know if the physical thickness of a dome can be less than the minimum focus distance of the phone if I want to capture in focus whats on the bottom surface of the dome.
From the other thread
https://www.photrio.com/forum/threa...m-focus-distance-digital.169411/#post-2261974

If I have a physical size restriction of 1"x 1"x 1" (a cube) roughly, as in the dome magnifier can not be larger than this, is it possible to accomplish what I need?
Or does the dome magnifier required to be 7cm/2.5" in thickness? (my phones minimum focus distance)

Is there an online calculator for this type of thing? I know there is the thick lens calculator.
https://www.optical-calculation.com/calculations/thick_lens_paraxial_parameters.php

I don't really know where to start.

Does anyone here have a dome/paperweight magnifier they could try an experiment for me?

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