IPHONE SCREEN - 100X

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Jonnyvine
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IPHONE SCREEN - 100X

#1 Post by Jonnyvine » Fri Mar 16, 2018 9:50 pm

Ever wondered what your iPhone screen looks like up close? 8-)

Specimen taken at 100x magnification.

Image

Please leave any comments on what you think... :)

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Crater Eddie
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Re: IPHONE SCREEN - 100X

#2 Post by Crater Eddie » Sat Mar 17, 2018 12:15 am

Cool!
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75RR
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Re: IPHONE SCREEN - 100X

#3 Post by 75RR » Sat Mar 17, 2018 6:00 am

Interesting. I take it that was the 'white' background screen you imaged?
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MicroBob
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Re: IPHONE SCREEN - 100X

#4 Post by MicroBob » Sat Mar 17, 2018 6:57 am

Good idea for a microscope object!
Compared to biological objects it is not so easy to find small man-made structures to look at under the microscope.

Old microchips are interesting, but it is difficult to remove the housing.

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Re: IPHONE SCREEN - 100X

#5 Post by MichaelG. » Sat Mar 17, 2018 7:58 am

Jonny,

Please forgive me questioning, but I find myself confused by your stated magnification
... Could you kindly explain ?

The latest iPhones have a somewhat higher resolution; but on most models, the 'Retina display' has 326 pixels per inch
https://en.m.wikipedia.org/wiki/Retina_Display
and 326ppi equates to a pixel pitch of 78 microns

100x magnification would make an apparent pixel pitch of 7.8 mm

How are you specifying your magnification ?

Thanks
MichaelG.
.
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P.S. ... Yes I agree, these displays make interesting subjects
Here you can see an image of my iPod Touch '4th Generation' screen for comparison:
viewtopic.php?f=5&t=5732
This has the 326ppi resolution, but appears to be of different construction to that on the iPhone.
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75RR
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Re: IPHONE SCREEN - 100X

#6 Post by 75RR » Sat Mar 17, 2018 8:23 am

Here you can see an image of my iPod Touch '4th Generation' screen for comparison:
viewtopic.php?f=5&t=5732
One can copy the link of the actual post in the topic:
viewtopic.php?f=5&t=5732#p51337
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
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Re: IPHONE SCREEN - 100X

#7 Post by MichaelG. » Sat Mar 17, 2018 8:30 am

75RR wrote:
Here you can see an image of my iPod Touch '4th Generation' screen for comparison:
viewtopic.php?f=5&t=5732
One can copy the link of the actual post in the topic:
viewtopic.php?f=5&t=5732#p51337
Thanks for pointing-out that useful feature
[it is lacking from the other forum that I use]

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Jonnyvine
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Re: IPHONE SCREEN - 100X

#8 Post by Jonnyvine » Sat Mar 17, 2018 2:01 pm

I used the 10x objective and a 10x eye piece, so I calculated 100x total magnification.

I think it might be different sizes depending on electronics for example television, tablet or smartphones.

This was a iPhone 5s for your reference.
Last edited by Jonnyvine on Mon Mar 19, 2018 1:39 pm, edited 1 time in total.

MichaelG.
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Re: IPHONE SCREEN - 100X

#9 Post by MichaelG. » Sat Mar 17, 2018 2:54 pm

Jonnyvine wrote:I used the 10x objective and a 10x eye piece, so I calculated 100x total magnification.
That seems perfectly logical
... I therefore remain utterly bewildered.

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MicroBob
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Re: IPHONE SCREEN - 100X

#10 Post by MicroBob » Sat Mar 17, 2018 8:12 pm

I see an image width of about 21 pixels and this means that at 326 dpi this is 1,6mm

Here is a formula for the calculation of the FOV:
https://www.microscopyu.com/microscopy- ... ld-of-view

With a field number of 16 and an objective of 10:1 this would fit. Looks perfectly normal to me.

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Re: IPHONE SCREEN - 100X

#11 Post by MichaelG. » Sat Mar 17, 2018 9:55 pm

MicroBob wrote:I see an image width of about 21 pixels and this means that at 326 dpi this is 1,6mm

Here is a formula for the calculation of the FOV:
https://www.microscopyu.com/microscopy- ... ld-of-view

With a field number of 16 and an objective of 10:1 this would fit. Looks perfectly normal to me.
Thanks for that link, MicroBob

I have no argument against that logic, as a method of assessing the visual field of view:
But I am still struggling to see it as a calculation of photographic magnification
... Probably because I generally use 'eyepiece projection' onto the sensor

Presumably, Jonnyvine is using 'afocal' imaging ... in which case the optics of the camera should [in my opinion] be taken into account when stating magnification. Edit_2: Although, frankly, I do not know how this would be appropriately expressed.

Ultimately, of course; with both techniques we usually apply further magnification at the point of display.

Forgive me if I am making hard work of this !!

MichaelG.
.
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Edit_1: For what it's worth ... Jonny's photo displays at a width of 160mm on my iPad Pro 9.7" screen, in landscape format.
So, for me, the final image is indeed at 100x magnification.
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Re: IPHONE SCREEN - 100X

#12 Post by MichaelG. » Sun Mar 18, 2018 4:32 am

Here is Leica's discussion of the issue:
https://www.leica-microsystems.com/scie ... ally-mean/

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MicroBob
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Re: IPHONE SCREEN - 100X

#13 Post by MicroBob » Sun Mar 18, 2018 6:40 am

The given eyepiece magnification means that you see the image 10x enlarged compared to viewing it with the naked eye from a distance of 250mm. This is recorded by the camera. When you look at the photo from the right distance, this magnification is maintained.

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Re: IPHONE SCREEN - 100X

#14 Post by MichaelG. » Sun Mar 18, 2018 7:08 am

MicroBob wrote:The given eyepiece magnification means that you see the image 10x enlarged compared to viewing it with the naked eye from a distance of 250mm. This is recorded by the camera. When you look at the photo from the right distance, this magnification is maintained.
I am evidently worrying too much.

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Jonnyvine
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Re: IPHONE SCREEN - 100X

#15 Post by Jonnyvine » Mon Mar 19, 2018 9:07 am

Just a note for everyone discussing what magnification it was taken at.

I just checked and realised my eye piece says "10xWF". So it's a 10x Wide Field (18mm) eye piece. :roll:

Is my total magnification still 100x?

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Re: IPHONE SCREEN - 100X

#16 Post by MichaelG. » Mon Mar 19, 2018 2:05 pm

Jonnyvine wrote:Just a note for everyone discussing what magnification it was taken at.

I just checked and realised my eye piece says "10xWF". So it's a 10x Wide Field (18mm) eye piece.
Is my total magnification still 100x?
Visual magnification is still 100x
The photographic magnification also remains constant.
The Field of View is 'evident' [because we can see a croppped circular image]

As I think we have successfully clarified ... The final magnification is related to the display [or print] upon which the image is presented: This makes it impossible to state a definitive single figure without making reference to the display and the viewing distance.
MicroBob's point is entirely valid; i.e. It's the angle of view that matters.

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Jonnyvine
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Re: IPHONE SCREEN - 100X

#17 Post by Jonnyvine » Fri Mar 23, 2018 1:13 pm

I see, thanks for the point.

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