chantepierre

7 ms·

61.
by chantepierre 1y ago
I'll push him to tidy this up :)
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by chantepierre 1y ago
Hey, I missed your comment. Nowadays the best source for optics is often a secondhand instrument where you scavenge the optics. If we specifically talk about a 6"f/5, most recent industrial tubes have really decent optics. Buying
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by chantepierre 1y ago
You need smooth movement on altitude and azimuth axes, then the telescope must be still and vibration-free to enjoy the view. The other constraint is structural integrity to maintain alignment of the optics. Those two things are the basis o
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by chantepierre 1y ago
I don't have enough experience with nylon to assess whether it would be suitable for a full telescope, sorry.
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by chantepierre 1y ago
The 6" f/5 can often be found cheap and without a mount, but if you are beginning, absolutely find some secondhand dobson before going DIY. Or better : attend a few nights at a nearby astronomy club, that will allow you to get a f
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by chantepierre 1y ago
It's a compromise between having a geometry that is rigid enough to ensure the bottom and top planes stay aligned while the telescope slews up and down, while having a practical shape at the bottom (a square) and avoiding struts going
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by chantepierre 1y ago
Dobsonian mounts are made to feel great and work with friction between (here) plastic and teflon pads, both in the altitude and azimuth axis. The goal is to have your telescope properly balanced so there is no need to apply force to hold it
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by chantepierre 1y ago
There are a bit more information on his website [1] and I've made a temporary grouped BOM [2] : [1] https://la3emedim.fr/assets/SMALLEST%20-%20README.pdf [2] https://docs.google.com/spread
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by chantepierre 1y ago
Yeah his site isn't currently the clearest for that. Here's a direct link to his build instructions [1] and I've made a temporary by-item BOM [2] while he improves things. PETG is great, ASA and ABS might be better if you hav
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by chantepierre 1y ago
For budget entry eyepieces, the generic "goldline" eyepieces have pretty good bang for their buck, especially the 9mm/6mm ones. You can find them unbranded online, or the "redline" equivalents. I'd recommend a
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by chantepierre 1y ago
6" f/5 kits sold by GSO are okay, but the best choice is to find any second-hand skywatcher 6" f/5 tube on your leboncoin/craigslist equivalent and scavenge the optics. For industrial optics, they are on average exc
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by chantepierre 1y ago
The rods are heatshrink tubing wrapped-aluminum. I personnally have built a few partially 3d printed, or full 3d printed (except for a few hardware items and carbon fiber rods) telescopes – it all depends on print preparation skill, correct
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by chantepierre 1y ago
The Hadley is the perfect gateway to telescope building. A 6" packs a lot more punch in a not too much bigger package, and 6" f/5 consumer mirror kits that we test often range from okay (0.77+ strehl) to actually quite good (
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3D printable 6" f/5 compact travel telescope model(printables.com)
96 points by chantepierre 1y ago|48 comments
75.
by chantepierre 1y ago
Hello HN, A friend released files for this 6" f/5 telescope conversion kit yesterday. It is a synthesis of a lot of telescope builds he, I and a few friends made over the last years, as well as general ideas floating in the amateu
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by chantepierre 1y ago
I'm currently donating monthly (small amounts alas) to : - Hologram, an isomorphic web framework in Elixir by Bart Blast - Torchlensmaker, differentiable optics with pyTorch by Victor Poughon Both projects are to this da
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by chantepierre 2y ago
If you want a purely visual experience (which I recommend), a dobsonian telescope has the best capability VS price ratio. The collapsible 150mm dobsons are already very powerful and quite compact. Avoid anything on a tripod under 500$, you&
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by chantepierre 2y ago
That sounds about in line with a microlithography vendor (UK) I ordered zoneplates from. 7-10µm features were accessible and going to 0.7µm was an order of magnitude higher (and went from film to chrome on glass IIRC). File size was also a
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by chantepierre 2y ago
That's awesome, are you using lithographic processes to produce the diffractive elements ?
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by chantepierre 2y ago
It's not about price, but enjoying the process, or making instruments that just are not commercially available. Amateurs are constantly pushing the limits of optical designs. Here is a recent groundbreaking example from Rik Ter Horst,
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by chantepierre 2y ago
I'm truly sorry for your experience. A first mirror can be a lot of process and can indeed get a bit messy. With experience (or guidance, which is even better) you can work cleanly and avoid glass dust contamination of your workspace.
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by chantepierre 2y ago
Telescope making is much alive and there are communities of people (even young people) making their first mirrors right now. Most find their entry in the hobby via the forums (CloudyNights's ATM, Optics & DIY forum, Stargazersloung
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by chantepierre 2y ago
There are dedicated "dirty" schedulers for long-running NIFs that by nature cannot be preempted, to avoid interfering with BEAM process scheduling : https://www.erlang.org/doc/apps/runtime_tools/sche
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by chantepierre 2y ago
I love to see "well-known" people in the Elixir community endorsing and actively developing that kind of approach. Our VM and runtime does so much and is so well suited to orchestrating other languages and tech that it sometimes f
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by chantepierre 2y ago
Continuing bootstrapping my software+service company Alzo ( https://alzo.archi/ ), an Elixir modular monolith. The first clients are here and I am working on "darker tech" now, a single codebase injecting their data
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by chantepierre 2y ago
Working on Alzo ( https://alzo.archi ), a half-SAAS, half-service business giving knowledge management + call for offers / layout automation to french, mid-sized architecture agencies. It's kind of niche but I'm d
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by chantepierre 2y ago
The little test was fun. I scanned it a bit too quick, and was confused when my tests failed with real user input. I did not see the "1-indexed" instruction for user-supplied coordinates while playing against the clock. I guess th
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by chantepierre 3y ago
Hello, thank you for this work as it shows great creative potential. A suggestion for runno's website, though : when I clicked on the link posted on HN, I did not expect to download that much data. Maybe you could find a way to offer p
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by chantepierre 3y ago
Really nice work ! I don't, as I'm doing 100% visual. Your Sadr region picture is really beautiful with subtle contrasts preserved
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by chantepierre 3y ago
That's my ultimate goal, an itinerant astronomy car to go in villages where there are no astronomy clubs. I also started teaching the few things I know about mirror making to my club and whoever asks. I'm building public-compatibl

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