This series of collimation  videos are the best I've seen on Youtube. They clearly lay out the principles; how to diagnose and finally how to collimate.

This was produced in the mid 1990’s. Lots of new tech available now, but the principles remain, as well as the need for understanding the basics. Rich

The monaural, sound in one ear, and the long-winded explanations tested my patience, but having made my own Dob, I  can appreciate the  things Mr Dobson didn't put into his design.  I may go back and update my mirror cell.

Best collimation video on youtube! thank you

Very informative and extremely interesting to see how some of those newts/dobs were assembled prior to todays offerings.  The difference in how the secondary and primary mirrors were secured would definitely make collimation much more difficult. I have owned a 10” dob for a decade now and have been very impressed by how crisp the views are when collimated to as close to perfect as I see it through the cheshire.  Add a couple of high quality EPs and off you go!  I will say that i do my initial collimation with a laser and do a final check with the cheshire.  Cheers and thanks for sharing this series!   Clear skies to ya!

Cool informative and funny 😂

My old Celestron Starhopper single stalk wasn't quite collimated so I used a thin piece of cardboard as shown and shimmed the focuser.  Now the focuser axis intersects the secondary axis as shown in the video.  I had to search my YouTube history to find this video again.  Thanks!

Finally a Cheshire collimation explained!!! TY!

Video muy instructivo, las explicaciones paso a paso y claras para todos los que nos iniciamos en el mundo de la astronomia como aficionados. Felicitaciones

I liked the learning by doing method here.
The others show less info and are often just a visual overview of the process.
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What he failed to mention or make very clear in 'Part 1', after dropping the secondary mirror assembly down the 'OTA' or 'Optical Tube Assembly!', was; "This will likely lead to primary mirror damage!", "Do not let this happen.", "Do this step in a horizontal or front/downward angle."
Yes he does mention a caution warning.

Great job! Right to the point. This is a big help

wow, thanks!  excelent videos.. the best ones i've seen of how to collimate... and i have seen a lot!!   who is that kind fella on the videos?

Did you say Binford 2000 screwdriver?   Home Improvement reference ..... no one catches it till me.  Lol

Binford 2000 electric screwdriver...🤣🤣🤣