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Ultralight telescopes


Ross Sackett Moonsilver series

Moonlight IV: 18" f/4.3, 63 lbs



Litescope, woden litescope dot net, 

astromart



Single arm CSA telescope on hkastroforum. YouTube 



Zingaro

Martin Bruckner Quints 

Roel:

Laurent 

Dreamscope 

Wah! 25kg

Dbpeckhan

Another CF telescope 

8" 3D printed OTA: 8 lbs

Honeycomb 16” mirror, 50mm thick, 5.2 kg



Reference:

Cloudynights 

CN: How much your dob weigh

Serrurier truss 

Tensigrity 

OSP2017 

Bend strength , calculator  

Truss calculator

Beamguru

CF vs AL : half the weight, but 6 times the cost

Tripods 

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劣質洗衣機入水喉

上面白色是最易找到,$2x. 但漏水. 灰色, $4x, 是假冒 "MADE IN ITALY"  假冒 "MADE IN ITALY"  的標緻  左面是白色膠喉的喉頭, 右面是灰色膠喉的喉頭, 上圖左面是真正 好貨 ( MADE IN ITALY )灰色膠蓋.右面是冒牌 白色膠蓋. 膠蓋在安裝扭緊時爆開  上圖左面是真正 好貨 , 標了其他規格.右面是冒牌, 單單印了 MADE IN ITALY  好貨的膠蓋是可以下移, 露出喉頭及黑色軟膠墊 黑色軟膠墊是有坑紋. 質感較柔軟. 緊後可以"迫實"水龍頭 及喉蓋, 沒有滲漏 正板 MADE IN ITALY 賣 $4x, 價錢絕對合理. 冒牌貨在旺角新填地街買的, 也是$4x. 真是要小心!!! NB: MADE IN ITALY 是否真正 意大利制造實在無從考 証
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ES8311 and ES8388 codec IC

ES8388 audio codec module is one of the audio codec modules available that is supported by ESP32 and official ESP-ADF releases. The ES8388 module lets you have: Stereo microphone and line input Stereo headphone and line out Up to 96 kHz 24 bpp high quality audio This module is compatible with all MCUs that have I2C and I2S ports (like ESP32, ESP8266, STM32, i.MX6, Raspberry Pi, etc) ES8311 Maxgerhardt github PCBartist twblogs ESP32-A1S  (limited stock)Audio codec AC101 or ES8388 built-in. NB the pinouts and firmware are different! Arduino - ESP31-A1S instructable Phil Schatzmann and his github   Simple A2DP thaaraak github on ESP32-A1S github of Yveaux and  Marcel-licence ESP ADF   example:  Logitech PiCorePlayer squeeze lite squeezebox forum   ESP32-Audio-kit  (from AI thinker) based on ESP32-A1S, is simple and small. But upgrade-ability seems limited  Alex John Talbert mixer equalizer: can this be used as simple equalizer? how about proces...
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sharpstar 150mm f/2.8 hyperbolic astrograph

to be launched in summer, 2019. spot diagram is now available, and connections diagram to camera is shown . list price RMB 13,000 ( USD 1900 approx) comparing this with Takahashi epsilon-180ED: spot diagram: connections: the focuser is 2.5 inch, and threads are M48 x 0.75mm   cloudynights first impression threads   some nice photo review from skypoint   Astrofotoblog review  c
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