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Hello Frank, Really appreciate your tutorial. The fourth order aberration you mentioned in the video I assume you are referring to as the wavefront aberration right? and its derivative is the 3rd order seidel aberration. thanks!

Jeff Oppenheim Alfa Romeo Team F1.

Wonderful (even 10 years later!) Thank you.

Shredded that place up 🔥

So, you know that double switchback at the beginning on Chaparral? I manage to clear that 25% of the time. Never though it was possible until my brother proved me wrong. Video doesn’t do it justice. It’s very steep. Track stand practice helped me a lot. Nice video and I love the data overlay!

Thank you very much. Now I know why the 6 element double gauss lens in the zemax samples produce excellent simulated results

I should be studying for a test tomorrow. I don't even know what this lens does. God help me.

Thank you for the video! You guys rock 🎸

That looks awesome! But not for me just now. I just went back out for the first time in nine years last week. Man, I am OUT OF SHAPE!!!

My husband is a tool and die maker.. 45 years. Not many real tool and die makers left. He started as a machinist and is a Supervisor now. Not a trade you can train in house. Not everybody has the math skills or the ability to see the finished product. Today's tool and die maker are really just technicians. Everything is CNC and more like assembly work. Or the flip side of that is repairs..which isn't really die making or tool making..its repairing.. a technician. My husband is totally up to date on current trends, programs and computer software but was doing it long before computers..drawing his own blueprints by hand. Math skills and the ability to see it..See lots of people who tried but didn't have it. America needs all we can get. Money is better than it was..still high stress though.

Our group too saw the elk on the beach after Fern canyon and a picnic. Big fat sucker male was right near us. Some were closer to the water. Gold Bluffs Beach is not easy to walk but those suckers are out there.

watched the whole ride. the trail is much harder back then compare to this date. some of the logs been removed. i love watching your vids

Which specific trail is this?

when any company hires an employee then it is job of the employer to train their workers. It does not matter if you are one employee shop or multinational. The reason that there are die makers in US is because the big multinationals like your company moved all the manufacturing away from US and kill all the demand for the die makers. Come on Tim, admit it. You just don't want to pay American salary and put up with American labor laws and environmental laws while amassing incredible amount cash while selling your phones to American.

Not an easy feat, as this is a narrow trail, technical in several places!

i like your videos.

Very well done my friend! It has helped me understand the Double Gauss design much better.

how not to hike. don't go up into the mountains if there's a chance of thunderstorms.did you actually summit? how come no footage? that's for the video, still a hike to remember

I just rode this today, but from the opposite direction (clockwise). Corcoran going uphill was brutal. I walked most of it. Gotta try your direction someday.

Just as brief FYI it’s pronounced Leyets not Leets. You wouldn’t say Eezenhower (Eisenhower). When in the middle of a word, in German “ie” is phonetically a long E where as “ei” is a long I.

Good relfex avoiding those roots

what race stage was this ?

thanks. i first saw these guys, probably their great great great great great grandfathers, 50 years ago. a place on earth where very little has changed.

Actually said "I stopped to piss"

Best shop tour I have seen, watched the entire 46:15. Enjoyed Grandpa and his enthusiasm for his toys. Awesome.

Нам в России до вас далеко((((Но мы стараемся строить удобные мастерские тоже!!!

i've been a tool and die maker for 21 years so i know what it was then, and what it is now. Most of the skilled workers quit the field because wages dropped while the cost of living continued to sky rocket. it really is that simple. tool and die is very VERY challenging work, both mentally and physically. When i first started in 1996 it was 1 man per 1 machine. Now I have 8 machines that I am responsible for, and my boss expects me to keep as many running at 1 time as I can. Aaaaand I also do all my own programming and pre-machining layouts. At some point you are putting in way more than you are getting back. And thats when workers quit.

great video. great for myself as a neophyte optical engineer. :)

Free garmin software called virb edit

how did you augment the data on the screen in real time?

1st generation woodworker here, can't wait till I can be the old man showing the herd around the shop.

how you made the calculation in step 1? the first eq. is above, what is the second one?

Pretty sweet, who are they?

FUN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Very informative - thanks

nice video! The real time grade metric really helps show the steepness of the trail.

@BurnsRubber, were did you start this run?

keep practicing!

Thanks Mike. Too bad I missed you. I find the GoPro to be a good training tool. I see new lines reviewing the footage and sections where I can carry more speed. I am still learning. I do try to scrub speed through blind sections in case there are hikers on the trail. Go fast, but safely.

I found a really nice singletrack today that I hadn't seen before. Turn right immediately after the Backpacking Camp and take that all the way up and through the gate. It spits you back out on Somersville. It's worth a ride if you haven't yet.

Your videos are awesome. I actually rode this trail this morning, must have barely missed you.

That's funny lol

It would be wonderful to be able to see a higher definition version, as this is just shot from somebody's television screen. They had to be frustrated, as I was, not to be able to see the various versions of the commercial. Hint to Visit Humboldt people! It was shown through SF Giants game and GS Warriors game. Both won!

This is simply wonderful, magic, and easy to watch again and again and again. Bravo!

I would love to hang out with this guy for a day and build something. I don't know anyone around me that even owns a saw

Dang that ride up must have been brutal.

Wonderful Woodshop, i hope you had some more wine after this.

Big business ceos like tim cook are the reason tool and die making is a dying trade in the US. Its all about their pocket and nothing else. The US manufactures much more complex tooling than any of the fixturing and dies used to manufacture apple products. He should have just stuck to the tax excuse and left US tool and die makers out of it. im sure there's lots of ignorant people that believe this two faced liar, but not everyone is an idiot

King Tim Cook manufacturing products in china: Cheap Labor Wages and Skills. USA have lost skills over the years. One of so many things that is killing U.S. economy. I agree with Donald Trump bring jobs back to the USA.

Even if he may be right about the future of mobile technology, I wish Apple would invest more in their desktops and Mobile devices, in that they should be more modular. I want to be able to upgrade my current Mac Pro just as I do now, as I would with a Mac Pro, years down the road.