Hypercentric optics: A camera lens that can see behind objects

Telecentric and hypercentric optics are very different from our eyes or normal camera lenses. They have "negative" perspective or no perspective, respectively, leading to very unusual images. In this video I show how to use a common fresnel lens in the creation of your own telecentric optical system. 

Fresnel lens, 300mm dia. 200mm FL is sold out... https://www.amazon.com/gp/product/B071ZQL9YZ/ 

$5 projection lens on eBay: https://www.ebay.com/itm/Delta-108-Projection-Lens-from-U-S-Precision-Lens-inc/264605738684 

Good practical discussion of telecentric optics: https://www.lockhaven.edu/~dsimanek/scenario/labman3/telecen.htm
https://www.mii.cz/art?id=626&lang=409&style=4

Idea to use macro tubes for telecentric conversion of normal lenses came from here: http://www.4photos.de/camera-diy/Telecentric-Lens.html 

In-depth info on telecentric lenses: https://schneiderkreuznach.com/application/files/9715/0781/8897/optical-measurement.pdf 

Commercial hypercentric and telecentric lens maker: https://lw4u.com/ 

Paper on making telecentric lenses with fresnel front elements: https://sci-hub.tw/10.1117/12.455256 

https://www.patreon.com/AppliedScience

Alpha radiation makes sparks, detects smoke, and eliminates static cling

Interesting applications of a strong polonium-210 alpha radiation source.  The half life is only 140 days, so the Staticmaster brushes must be replaced every year or so.

Great technical article on ionization smoke detectors: https://circuitcellar.com/wp-content/uploads/2012/06/CC2011110601.pdf

Staticmaster refill: https://www.amazon.com/Static-Master-4331991414-Static-Master-Refill/dp/B0000ALKDH/

Ionization chamber: https://www.aliexpress.com/item/32838644316.html

Carl Willis' video on spark gap detectors. (check out his whole channel) https://www.youtube.com/watch?v=-8GlzUjYazs

Polonium poisoning: https://en.wikipedia.org/wiki/Poisoning_of_Alexander_Litvinenko
https://sci-hub.tw/10.1088/1361-6498/aa58a7

Mightyohm geiger counter: https://mightyohm.com/blog/products/geiger-counter/

Applied Science on Patreon: https://www.patreon.com/AppliedScience

Antique 4x5 camera creates 20 micron photolithography masks

I use an antique 4x5 view camera to create high resolution photomasks in my home shop.

Source of film and developing chemicals: https://www.freestylephoto.biz/531345-Arista-Ortho-Litho-Film-3.0-3.9x4.9-50-Sheets-For-4x5-Film-Holders

Possible source of poster-sized printouts: https://blueprintsprinting.com/pricing/

Gold on microscope slide: https://sci-hub.tw/10.1109/MEMSYS.2013.6474404

Commerical microelectrode arrays: https://www.multichannelsystems.com/products/microelectrode-arrays

Vacuum film holder: https://web.archive.org/web/20111016132122/http://cloudynights.com/documents/large.pdf

Test patterns: http://www.bealecorner.org/red/test-patterns/

Thought emporium: https://www.youtube.com/user/TheChemlife

Huygens Optics: https://www.youtube.com/user/huygensoptics

Sam Zeloof: https://www.youtube.com/user/szeloof

Support Applied Science on Patreon: https://www.patreon.com/AppliedScience

Electron microscope animation: Carbon nanotubes pulled into thread

First-ever animation of carbon nanotubes self-aligning into a thread, captured by an electron microscope (as far as I know). Electron microscope animation of phonograph needle: https://www.youtube.com/watch?v=GuCdsyCWmt8 Toothbrush: https://www.youtube.com/watch?v=cwN983PnJoA Active integrated circuit in homebuilt electron microscope: https://www.youtube.com/watch?v=eoRVEw5gL8c Electron microscope image capture system: https://www.youtube.com/watch?v=ruuxn2u3yao https://www.patreon.com/AppliedScience

Details in the process of making "blacker than vantablack" coatings (part 1?)

Recreating MIT's "blacker than vantablack" in a home shop (almost). MIT press release: http://news.mit.edu/2019/blackest-black-material-cnt-0913 MIT nanotube-on-aluminum paper: https://sci-hub.tw/https://doi.org/10.1021/acsami.9b08290 NIST nanotube darkness comparison: https://aip.scitation.org/doi/pdf/10.1063/1.5009190 Shaper handheld CNC router: https://www.shapertools.com/
Almost-as-large quartz tube (I used 76mm OD) : https://www.ebay.com/itm/Fused-quartz-glass-tubing-OD-50mm-x-ID-46mm-x-L-1-240mm-48-Free-Shipping/113713893883 Insulating firebrick for tube furnace: https://www.ebay.com/itm/Insulating-FireBrick-Thermal-Ceramics-K-26-3-10-pk/131698699891 Black velvet on Amazon: https://www.amazon.com/gp/product/B07BGZ82XH/ LR-1 spectrometer: http://www.aseq-instruments.com/LR1.html Applied Science on Patreon: https://www.patreon.com/AppliedScience