Lets focus on Lens - Russ Sadler

[Pete Cyr]

Russ has created a thoughtful and detailed review of len performance using a wide variety of lens. Included are pictures and numerical findings to support conclusions. It is recommended you watch the video and then review the data compiled in the attached pdf.

170 https://www.youtube.com/watch?v=yO2TD_h8_nI

Russ Sadler-Lets_Focus_on_Lenses.pdf

171 https://www.youtube.com/watch?v=SqxG9z5MHns

172 https://www.youtube.com/watch?v=iOsVvz2zEBY

How lenses cut.pdf

[Jonas Rullo]

I just watched the video. I've been subscribed to the youtube series for about a year. Thank you so much for providing real world hands on examples of how you get things done. Always great info there. I regularly share the video links with my 3d printing and making group.

Jonas.

[Tim Mellor]

Latest video and details on this from Russ

https://www.youtube.com/watch?v=iOsVvz2zEBY

[Andrew Parrott]

Just downloaded the PDF's and have some bedtime reading.
Thought I better get up to speed after watching RDWorks Learning Lab 197 Long Compound lens Part 2

[Philipp Pap]

Is it ok to make a focus extender with a 3d printer with petg? I don't know how hot the lens gets, but with 3% power costing at 50Watt 1,5Watt would get converted to heat, but there is an air assist cooling, what do you think? (The lenses will arrive in a month)

IMG_20210122_103704.jpg

[Pete Cyr]

You should be fine - if the lens gets hot it will be due to impuries (smoke, debris finger prints) on the lens. In which case it will crack - the lens holder is a lesser issue.

[Gene Uselman]

Phillipp- did you design the tubes [especially the threads] yourself or find an .stl? I need some nozzle extensions in different sizes. I have high hopes for Russ' latest experiments.

[Philipp Pap]

Yes, designed it myself, took a few tries to get the threads right. I published it https://www.thingiverse.com/thing:4733069. A friend has solidworks, I can make adjustments if you like, but it might take a few days.

[Philipp Pap]

And yes, I'm also following the lens adventures from russ!

[Gene Uselman]

Thank you- I actually use Fusion 360 for design- I should be able to modify it with Meshmixer to get the shorter extensions that I am thinking of. I find that getting the nozzle closer to the material you are cutting works way better.