Magnification is not a good metric to use.
The web site claims 800 nm resolution, which is reasonable.
But magnified 2,000 times, that 800 nm is 1.6 millimeters, which is a little large for a pixel.
At 300 pixels per inch (such as a cheap printer or a good cell phone), you get a magnification of 105x.
To calculate the numerical aperture of the lens, we take 1.22 times the wavelength of the light we are using (we'll use 500 nm for green) and divide by the resolution. We get 0.7625.
A decent 40x objective lens has a numerical aperture of about 0.65, and a nice 60x objective has a numerical aperture of 0.85, so this lens lies somewhere in-between, so it is a pretty nice lens.
I am assuming that the folding microscope does not have a substage condenser, which would double the resolution, so the lens would only need to be half as good. A compound microscope with a cheap 20x objective (0.40 numerical aperture) and a matching substage condenser would have slightly better resolution (762.5 nm). That microscope would generally use a 10x eyepiece, giving a magnification of 200x. Printed on paper, that would be 166 pixels per inch, which is still quite a bit of "empty magnification".
On Tue, Mar 11, 2014 at 6:28 AM, Jeswin <phillyj101@gmail.com> wrote:
You guys hear of this? Sounds interesting. They say it can do 2000x
magnification and cost only 50 cents.
http://www.foldscope.com/
--
-- You received this message because you are subscribed to the Google Groups DIYbio group. To post to this group, send email to diybio@googlegroups.com. To unsubscribe from this group, send email to diybio+unsubscribe@googlegroups.com. For more options, visit this group at https://groups.google.com/d/forum/diybio?hl=en
Learn more at www.diybio.org
---
You received this message because you are subscribed to the Google Groups "DIYbio" group.
To unsubscribe from this group and stop receiving emails from it, send an email to diybio+unsubscribe@googlegroups.com.
To post to this group, send email to diybio@googlegroups.com.
Visit this group at http://groups.google.com/group/diybio.
To view this discussion on the web visit https://groups.google.com/d/msgid/diybio/CAAhF0RKyD-XD5EnCxiU3BvGrNXwWAUgUVBf16hU9nQ-wACKqZw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
-- You received this message because you are subscribed to the Google Groups DIYbio group. To post to this group, send email to diybio@googlegroups.com. To unsubscribe from this group, send email to diybio+unsubscribe@googlegroups.com. For more options, visit this group at https://groups.google.com/d/forum/diybio?hl=en
Learn more at www.diybio.org
---
You received this message because you are subscribed to the Google Groups "DIYbio" group.
To unsubscribe from this group and stop receiving emails from it, send an email to diybio+unsubscribe@googlegroups.com.
To post to this group, send email to diybio@googlegroups.com.
Visit this group at http://groups.google.com/group/diybio.
To view this discussion on the web visit https://groups.google.com/d/msgid/diybio/CAA0yOM59Y%3D_0mhTLg6pn3d2rs9PxFSPAE4djciiNywGsmV3vdw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
0 comments:
Post a Comment