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Lets focus on Lens - Russ Sadler
Posted: Wed Sep 04, 2019
by 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.
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https://www.youtube.com/watch?v=yO2TD_h8_nI Russ Sadler-Lets_Focus_on_Lenses.pdf
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https://www.youtube.com/watch?v=SqxG9z5MHns
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https://www.youtube.com/watch?v=iOsVvz2zEBY How lenses cut.pdf
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Sep 06, 2019
by 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.
Re: Lets focus on Lens - Russ Sadler
Posted: Sun Oct 13, 2019
by Tim Mellor
Latest video and details on this from Russ
https://www.youtube.com/watch?v=iOsVvz2zEBY
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by 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
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by 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
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by 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.
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by 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.
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by 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.
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by Philipp Pap
And yes, I'm also following the lens adventures from russ!
Re: Lets focus on Lens - Russ Sadler
Posted: Fri Jan 22, 2021
by 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.