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ATM, Optics and DIY Forum

Amateur Telescope Making (ATM) and any do it yourself related activities. Ask questions, discuss and post pictures of telescope related projects, optics, telescopes, observing chairs, etc.

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Topic	Stats	Last Post Info
Pinned Post your Optical Design! (This is a no-discussion thread!) Started by Sean Cunneen , 05 Nov 2019 1 2 3 7 →	Hot 165 replies 18,397 views	Nodda Duma Yesterday, 09:17 PM
Pinned 3D Printed Astronomy Started by Gazpacho , 25 Apr 2020 accessories, ATM, DIY, equipment and 1 more... 1 2 3 24 →	Hot 590 replies 33,020 views	FarmerDave Yesterday, 08:46 PM
Pinned Post your home made scope Started by droid , 22 Jan 2013 1 2 3 66 →	Hot 1,632 replies 373,294 views	ChiefMcGeek 26 Feb 2021
Pinned Moderator Recruitment Started by WOBentley , 03 Feb 2021	0 replies 227 views	WOBentley 03 Feb 2021
Pinned Best of ATM and Help Started by MMICKELS , 02 Jul 2005	0 replies 56,595 views	MMICKELS 02 Jul 2005
Recasting a monster 16" Pyrex blank Started by ccaissie , Yesterday, 11:08 AM	1 reply 114 views	brave_ulysses Today, 01:28 AM
PLOP calculation help Started by jeanine , 05 Mar 2021	8 replies 186 views	brebisson Today, 12:50 AM
Buying large quantities of Pitch Started by elliotwoods , Yesterday, 10:20 PM	1 reply 77 views	dogbiscuit Today, 12:44 AM
Fibre reinforced plastic - Is this the right stuff for bearings? Started by ecorm , 23 Feb 2021	14 replies 285 views	don clement Today, 12:28 AM
Total Wavefront Error of a Two-Mirror-System Started by JuergenB , Yesterday, 07:30 AM	21 replies 268 views	MKV Yesterday, 11:35 PM
A list of Mirror Suppliers Started by flopearedmule , Yesterday, 08:38 AM	9 replies 194 views	Pinbout Yesterday, 10:50 PM
Dobsonian Base for 4.5" Scopes Started by Ginchy , 21 Feb 2021	5 replies 212 views	Ginchy Yesterday, 09:47 PM
Aluminum disc from drops making valves supplier? Started by PrestonE , Yesterday, 05:11 PM	2 replies 109 views	PrestonE Yesterday, 09:27 PM
DIY Power Box - Asking for thoughts Started by CanadianLoki , 16 Feb 2021	12 replies 309 views	Seaquel47 Yesterday, 08:39 PM
Idea for Helical focuser. Started by starcanoe , Yesterday, 11:02 AM	10 replies 180 views	MKV Yesterday, 08:23 PM
Wayno's 16" F/4.45 Dobsonian build Started by Waynosworld , 08 Jan 2021 1 2 3 7 →	Hot 171 replies 4,285 views	Waynosworld Yesterday, 07:47 PM
23.5" f/3.6 Dob Started by Augustus , 05 Jun 2020 1 2 3 22 →	Hot 549 replies 25,531 views	Augustus Yesterday, 07:25 PM
12.5" please help with planning the first build Started by Speo , 02 Mar 2021 Dob	10 replies 426 views	cheapersleeper Yesterday, 06:37 PM
PnP Focus: The simplest-ever Arduino focus controller Started by anat , 11 Oct 2017 1 2 3 13 →	Hot 316 replies 39,407 views	Sniuk Yesterday, 03:43 PM
Cutting truss poles to account for coma corrector Started by ppg677 , 06 Mar 2021	6 replies 161 views	Adam Long Yesterday, 02:01 PM
build: Equatorial ground board for 22" dobsonian Started by hamishbarker , Yesterday, 01:57 PM	0 replies 85 views	hamishbarker Yesterday, 01:57 PM
A question about mirror coatings. Started by 3c_273 , 04 Dec 2019 1 2	34 replies 2,237 views	Vulture Yesterday, 12:37 PM
800mm - the mirror Started by skround , 25 May 2020 mirror making 1 2	32 replies 2,082 views	tommm Yesterday, 11:20 AM
Help Needed with GEM Pipe Mount Plans Started by matt_astro_tx , 06 Feb 2021 ATM, DIY, equipment, mount 1 2	35 replies 746 views	matt_astro_tx Yesterday, 11:19 AM
NEW: Raspberry Camera V3 ASCOM driver Started by RoboRob , 12 May 2020 1 2 3 6 →	Hot 133 replies 11,093 views	stephen_gould Yesterday, 10:14 AM
just scored a dream blank, 16", 3" thick E-6 O'Hara Started by Moonbiter , 05 Mar 2021	12 replies 416 views	Oregon-raybender Yesterday, 03:12 AM
Rocker box joints Started by Piero DP , 25 Feb 2021 1 2	33 replies 802 views	Piero DP Yesterday, 02:51 AM
17.5" BinoScope Build Started by Bob4BVM , 04 May 2018 1 2 3 14 →	Hot 325 replies 19,084 views	Bob4BVM Yesterday, 01:04 AM
$37 Dobsonian DSC for DIY makers Started by Adun , 26 Aug 2017 DIY, dob, mount 1 2 3 11 →	Hot 270 replies 36,588 views	steveincolo 06 Mar 2021
Anyone know the diameter of the drive shaft for celestron equatorial motors? Started by Pokemoncrusher1 , 04 Mar 2021	3 replies 165 views	Pokemoncrusher1 06 Mar 2021
DIY Equatorial Inverted Fork Pillow Block Flange Bearing Build Started by Toups , 21 Feb 2021 Mount	6 replies 465 views	Toups 06 Mar 2021
Uses for 6" f/8 GSO primary? Started by Keudn , 06 Mar 2021 ATM, Astrophotography, Beginner and 1 more...	9 replies 224 views	Steve Dodds 06 Mar 2021
Shipping a mirror Started by Muleskinner115 , 03 Mar 2021	11 replies 379 views	Steve Dodds 06 Mar 2021
Effect of the Heat in Ronchi Test Started by Kanishka827 , 06 Mar 2021 ATM, DIY, Mirror Making, Optics and 2 more...	9 replies 178 views	Pinbout 06 Mar 2021
Building a heavy duty focuser for astrophotography Started by TopherTheME , 06 Dec 2020 1 2	48 replies 2,089 views	Matthew Paul 06 Mar 2021
16” mirror, 3” thick! Started by erick86 , 26 Feb 2021 1 2	42 replies 1,193 views	Waynosworld 06 Mar 2021
Help with Hurst DC Motor Started by matt_astro_tx , 04 Mar 2021	5 replies 175 views	InductorMan 06 Mar 2021
Another Scope Dolly Build! Started by John Miele , 31 Jan 2021	18 replies 552 views	John Miele 06 Mar 2021
Roel's 16" f/4 ultralight traveldob (Propdob Mega) Started by Roel , 03 Dec 2020 1 2	42 replies 2,938 views	Roel 06 Mar 2021
Secondary mounting plate material ? Started by Bob4BVM , 05 Mar 2021	4 replies 121 views	Dan_I 05 Mar 2021
4" Folded Refractor Build Started by bmwscopeguy , 02 Dec 2020 1 2	39 replies 1,033 views	$4" Folded Refractor Build - last post by bmwscopeguy$ bmwscopeguy 05 Mar 2021
What did you work on today? Started by Sean Cunneen , 18 Feb 2015 1 2 3 212 →	Hot 5,296 replies 339,117 views	Garyth64 05 Mar 2021
ASCOM DarkLight Cover/Calibrator Started by iwannabswiss , 20 Aug 2020	8 replies 752 views	iwannabswiss 05 Mar 2021
GSO 8" f/6 Ronchigram Started by mazdak , 15 Feb 2021 1 2 3	Hot 56 replies 1,407 views	davidc135 05 Mar 2021
All SKy Camera dome for the enclosure Started by sgreiner , 04 Mar 2021	4 replies 167 views	BGRE 04 Mar 2021
Ideas to illuminate finderscope crosshairs? Started by Pokemoncrusher1 , 04 Mar 2021	8 replies 229 views	geovermont 04 Mar 2021
house power supply to cg-4 motors ? Started by Adam82 , 04 Mar 2021	3 replies 143 views	macdonjh 04 Mar 2021
Surplus Shed 27MM x 285mm objective Started by texcoco , 23 Feb 2021	8 replies 402 views	texcoco 04 Mar 2021
worth shaving off some weight from a 18" blank? Started by CHASLX200 , 01 Mar 2021	23 replies 458 views	ccaissie 04 Mar 2021
The Ginoculars: 150mm f/5 Binoscope Started by Tucker512 , 17 Oct 2017	23 replies 2,774 views	starcanoe 04 Mar 2021