Hello!! It's Joseph

if you want to make an animation or gif from the image files ( image to video ) 1. align and crop ( optional ) 2. use ImPPG to align use PIPP to output as animation PIPP setting: PS: PIPP also has  center and crop feature, but it doesn't work for me.Only roughly 3 in 4 images are aligned properly ImPPG download PIPP download alternatives: - ImageMagick instead of PIPP using free / trial softwares: -  : MATLAB + 'minboundcircle' written by John D'Errico, github Which is in turn using convex hull - OpenCV + Lucas-Kande method (optical flow), using eg python -  互相关 + FFT in numPy R + astrolib using paid softwares: PixInsight, FFT registration script

中科院院士崔向群说，“1956年，杨世杰设计试制了我国第一台13cm施密特望远镜。”这台“天眼”上的镜片由杨世杰手工磨制成。 　　“用于科学观测的天文望远镜镜面非常复杂，不仅要能聚焦，还要求精确度为纳米级。人的手轻轻按在镜面上，手指的温度就会让镜面变形。”刘炎说，天文望远镜磨镜的要求，一般人难以想象。施密特望远镜是折反式望远镜，需要配备一个S形的复杂镜片，现在普通的光学厂也很难磨制出这样的望远镜镜片，但杨世杰在紫台工作的第二年，就设计试制成功了我国第一台13cm施密特望远镜，非常了不起，“那时候没有任何仪器，完全靠手工。要先设计演算，然后一点点打磨，达到效果。可以说，那时他的技术水准就已经达到了大师级。” 　　在1966年，经中科院院长郭沫若批准，三十出头的杨世杰被破格提拔为副总工程师。 　　为了研制更好的天文望远镜镜面材料，杨世杰大胆尝试研制陶瓷材料。 　　中科院院士熊大闰告诉记者，最开始，天文望远镜的镜片用石英磨制，因为它的膨胀率接近零。但是1公斤石英要1万块钱，在上世纪60年代是天价。杨世杰发现，陶瓷膨胀率也接近零，于是大胆试验。杨世杰带领骨干刻苦钻研，历经10年，终于使60cm陶瓷抛物面镜取得成功，于1978年获得全国科学大会奖和中科院重大科技成果奖。 　　熊大闰说，只是，陶瓷镜面没有被推广，而后来又有更先进的微晶玻璃新材料，所以，大众没见过陶瓷镜面的“天眼”。 二十世紀中國學術大典天文學 p151

using very careful ( otherwise cause damage to your eyes and your camera equipments) techniques and planning: From: Colleen Pinski, Sun's Embrace 500mm supertele lens on canon 7D ( APS-C):  800mm eqv focal length ND 4 filter (10 stops) ? 500 meters away from subject: Joshua Cripps Nikon Z 7 (full frame sensor ) in DX crop mode, with the AF-S NIKKOR 200-500mm f/5.6E ED VR lens attached using the Mount Adapter FTZ. Focal length at 500mm (750mm equivalent in DX mode),  f/8, 1/100 second, ISO 200, manual exposure, Matrix metering.  A 10-stop ND (neutral density) filter was on the lens.  400 to 500 meters away from subject nikonusa Albert Dros Sony A7 (full frame) ,400mm lens. 300 meters from subject. With ND filter Taron Lexton, Ted Hesser fstopper Nikon Z7 mirrorless camera and a Nikon AF-S Nikkor 500mm f/5.6 PF ED VR lens with a Nikon AF-S Teleconverter TC-20E-III ,1000mm eqv focal length f/...

tripod spreader set level by spirit level v. important mount onto tripod disengage DEC CW + rod telescope balance DEC engage DEC (RA?) connect cables: short straight RJ11: DEC box <> DEC port (on main motherboard unit, next to 12V input) long curly RJ11: 8048 hand controller <> HBX port plug in 12V power supply set time and position polar alignment CEM25p play fixing and belt tension on stargazerslounge   patent