f/0.38 camera lens made with oil immersion microscope objective

I removed the protective glass from a CMOS image sensor, and used optical immersion oil to couple the bare image sensor to a 40X NA=1.3 microscope objective.

f/0.7 Zeiss lens described in amazing detail: http://www.marcocavina.com/omaggio_a_kubrick.htm 

Fake f/0.33 Zeiss lens: https://petapixel.com/2013/08/06/carl-zeiss-super-q-gigantar-40mm-f0-33-the-fastest-lens-ever-made/ 

Camera and sensor that I used: https://www.ids-imaging.us/store_us/products/cameras/ui-5584le-rev-1-2.html 

https://www.onsemi.com/products/sensors/image-sensors/mt9p006?pdf= 

Conversion from f/# to NA: https://www.eckop.com/resources/optics/numerical-aperture-and-f-number/ 

More discussion about the f/#: https://wp.optics.arizona.edu/jpalmer/wp-content/uploads/sites/65/2018/11/The-f-stops-here.pdf 

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Mutarotation: a sugar that spontaneously changes from sweet to bitter

Simple sugars can exist in multiple molecular conformations, some of which have different tastes and optical properties.

Steve Mould's video on optical rotation: https://www.youtube.com/watch?v=975r9a7FMqc

Reaction's video on Mexican Coke: https://www.youtube.com/watch?v=NY66qpMFOYo

Research paper describing enzymatic synthesis of L-glucose: https://nopr.niscpr.res.in/bitstream/123456789/17714/1/JSIR%2061%285%29%20361-365.pdf

D-mannose on Amazon: https://www.amazon.com/Micro-Ingredients-Mannose-Supplement-Soluble/dp/B01L2TFP1Q

My crystals were almost entirely the sweet form, but it is possible that your bag may have the bitter-tasting form to begin with.

D-fructose on Amazon: https://www.amazon.com/Fructose-Fruit-Sugar-16-ZIN/dp/B07DXVSGJT

D-glucose, also known as dextrose, also known as "corn sugar", can be found on Amazon, or beer homebrewing stores.

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Micronics SLS nylon 3D printer makes electronic circuits

A new desktop SLS nylon 3D printer can make printed electronic circuits with the addition of a powdered catalyst and electroless copper plating bath. The printer is available here: https://www.kickstarter.com/projects/micronics3d/micron-a-desktop-sls-3d-printer







Applied Science video on SLA printed circuits: https://www.youtube.com/watch?v=Z228xymQYho

Favorite copper plating bath recipe: 

Heat 250ml deionized water to 60*C in a 300ml beaker, stirring at 350 RPM 

Add 2.5g CuSO4*5H2O, wait until dissolved Add 4.6g EDTA disodium dihydrate, wait until dissolved

 Add 0.84ml of 1% Triton-X 100 solution in water Dissolve 5.8g NaOH in 30ml DI water, stir until clear, then add to bath Add 4ml Formaldehyde (37% HCHO) 

Lower stirring to 100 RPM and begin filtration with 0.5 micron syringe filter and peristaltic pump. 

No intentional oxygenation or bubbling. 

Filter return is below surface for minimal splashing.

I experimented a little with PEG and 2 2' Bipyridine, but didn't find them impactful enough to discuss in this video.

  LED rectenna designs: https://josepheoff.github.io/posts/1-hatband https://www.nrl.navy.mil/STEM/LEctenna-Challenge/ Electroless copper references: https://www.nmfrc.org/pdf/p0295g.pdf Copper chromite catalyst: https://www.sigmaaldrich.com/US/en/product/aldrich/209317 Possibly available here: https://www.kremer-pigmente.com/en/shop/pigments/pigments-of-modern-age/spinel-similar-pigments/47420-spinel-black-no-42.html It's been backordered for a month, so I wasn't able to test it. Open Sauce 2024: https://opensauce.com/Support Applied Science on Patreon: https://www.patreon.com/AppliedScience

Photosynthesis photography: Making images with living plant leaves

How to make photographs using plant leaves: the technique, examples, f/0.5 camera lens construction, and tips & tricks that I learned along the way.

Inspiration for this project came from a 1970's video made by The Royal Institution: https://www.youtube.com/watch?v=l2JTiAASdyw

Starch formation refs: https://www.journals.uchicago.edu/doi/pdf/10.1086/329993

https://www.ars.usda.gov/ARSUserFiles/50820500/GPRG/2022PulicationsandSummaries/2022_Photosynthetic%20responses%20of%20greenhouse%20ornamentals%20to%20interaction%20of%20irradiance%20CO2%20and%20temperature.pdf

Video describing inkjet printed photomasks: https://youtu.be/bR9EN3kUlfg?si=k9RU6EwM5-pKx2tr&t=643

A different technique to make leaf prints: https://www.alternativephotography.com/chlorophyll-prints/

Video from Alpha Phoenix on making photos with cyanotype: https://www.youtube.com/watch?v=ewQQX3fxQKk&t=85s

Ray optics simulator: https://phydemo.app/ray-optics/

Giant tweezers: https://www.amazon.com/Stainless-Tweezers-Anti-slip-Aquascape-Maintenance/dp/B07LDLWJMM/

Anhydrous ethanol: https://www.extractohol.net/1gal-200-proof-pure-food-grade-ethyl-alcohol

Hanging basket geranium plant: https://www.lowes.com/pd/2-Gallon-Multicolor-Geranium-in-Hanging-Basket-L5450/1000151713

Methanol toxicity: https://en.wikipedia.org/wiki/Methanol_toxicity https://sci-hub.se/https://doi.org/10.1016/j.ccc.2012.07.002  Skin absorption in a quantity high enough to be a problem is rare, according to this.

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Measuring the amount of lead (Pb) consumed when drinking from lead crystal glassware. Is it safe?

I show a "DIY" chemical color-based method to determine the amount of lead in water, and then use the method to measure the amount of lead extracted from various types of lead crystal glassware.










Skip to 27:05 to see the detailed results 

Code, analysis, raw data, more references: https://github.com/benkrasnow/LeadCrystal 

Average daily lead consumption: 50ug in early 1980s, about 2/3 of this came from food and water https://openlibrary.org/works/OL18340799W/Food_contamination_from_environmental_sources?edition=unset0000unse_z0t6 

The FDA established a maximum daily intake for Pb called the Interim Reference Level (IRL). The IRL for children and adults is 3 μg/day and 12.5 μg/day, respectively. In 2022, FDA tightened its Interim Reference Levels (IRLs) for lead to 2.2 µg/day for children and 8.8 µg/day for females of childbearing age—a drop of 27% from the original IRLs it established in 2018. 

(2011) The estimated average daily dietary exposure of the French population to lead was 18 μg for adults aged 15 years or more https://apps.who.int/food-additives-contaminants-jecfa-database/Home/Chemical/3511 

ChatGPT on cloudy lead acetate solutions https://chat.openai.com/share/b24593ea-e467-4c41-ac79-55a4c0546a63 

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