I’d like to send you a weekly email with four quick tips to help you climb better, safer and smarter, AND a sampler of some of the most popular articles on my Premium Member pages.

Science geek note: the Fresnel lens was invented by a French physicist in the 1800s, and was originally used in lighthouses to concentrate the light beam. Several excellent examples can be seen at historic lighthouses, including several in Oregon.  When seen full size in a lighthouse, they are quite amazing!

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Jan 6, 2022 — Because the chromatic aberrations happen in the lens, not the sensor - the picture is already distorted by the time it reaches the sensor, ...

Heat Resistant 2mm Color Plastic Transparent Perspex PMMA Cast Acrylic Sheet, Find Details about Acrylic Plate, Plexiglass from Heat Resistant 2mm Color ...

RS232 Pin Out. Reference pinout diagrams for DB9 connector (sometimes known as DE9 connector or D-sub connector) for RS232 serial communication ports. RS232 is ...

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This website offers information and ideas (not advice) intended to reduce your risk when climbing. Many of the tips here are appropriate only for those with prior experience. All climbers need proper training and equipment, and to take personal responsibility for their choices.

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This high performance liquid light guide is ideal for visible and ultraviolet light applications. It has a 5 mm diameter active area and is 1.8 meters long. End adapters sold separately.

Contact Us · Integrated Components · Switching and Routing · Miniature Opto-Mechanical Switch (MOMEX Series) · Monitoring / Conditioning · C-Band, L-Band PIN ...

by Q Gu · 1996 · Cited by 3 — In this paper we show the relationship among the Lagrange invariant, the interference invariant and the space bandwidth product, they are important in ...

For a perfect optical system, the optical path, or distance, from an object point to a corresponding image point will be equal for all rays. In near-perfect ...

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This compound microscope is a day to day workhorse instrument for biological applications. This microscope features a 45 degree inclined, ...

Light GuideOptics

So, the way I heard the story . . . Several older and experienced hikers were hiking in the Columbia River Gorge. As light was fading, they needed to make a route choice at a trail junction. They pulled out their map . . . and couldn’t read it because no one had reading glasses! They didn’t know where to go, and decided to stay put for the night. (That was probably the best choice, and luckily they had the gear to do so in reasonable comfort.) The next morning, when there was enough light to read their map, they walked out unassisted.

For more “well seasoned” climbers, reading the small print on a map or phone screen can be tricky. But who wants to bring reading glasses on a hike or climb?

Lightguides

Polarized light refers to light that has been filtered to vibrate in a single plane. It is especially useful in metallography for revealing the grain ...

These little puppies are simply thin, flexible, plastic magnifying glasses. About the size of a credit card, they are dirt cheap, magnify to about 3x power, and really help to read that 8 point font. (The image clarity is not as good as what you’d get with a lens actually made of glass, but it’s probably  good enough to read your map and make the correct trail choice.)

• Liquid Light Guide • Better UV Transmission then Fiber • 5 mm Active Area • 1.8 meters in Length • End adapters sold separately

In-person instruction from a qualified instructor is strongly recommended for any technique that, if you do it wrong, could result in serious injury or death.

UVLight Guide

I respect your privacy. I'll never sell your personal info. Unless you get really famous. Then I might. We can talk then. =^)

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You can get a multi-pack of pocket magnifier lenses online for something like $1 each. So, buy a bunch, keep them scattered around your gear bags, and give ‘em away to your friends. Search Google for “pocket Fresnel lens”.

If you use any of the ideas or information presented here, you acknowledge that the technique may be inaccurate or out of date, and you agree that Alpinesavvy LLC is not responsible or liable for any injury (or worse) that might result from you using the techniques presented here.

If you want to show off your bushcraft skills, they can apparently be used in a pinch to even start a fire, provided you have steady hands, perfect tinder, and bright sunshine. (Disclaimer, I have never done this, your mileage may vary, and YouTube is your friend.)

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