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which one is best for portraits? medium shot TTartisan 75mm f1.5 ,aka clone of Biotar the swirly bokeh king model to camera distance: 1.46m depth of field 3.1 cm blur 7.53% canon 85mm f1.2 model to camera distance: 1.65m depth of field 1.9 cm blur 10.67% btw, you can get even more exotic swirl bokeh from 900g russian helios 40-2 85mm flickr simon utak youtube  on ttartisan 75mm łenses that swirl, really loņg list: sagittal astigmatism lensbaby nukepedia pencilofrays eckhardt petzval home built

  The toroidal superconducting magnet: The newly accepted toroidal field superconducting magnet, a D-shaped structure measuring 21 meters long, 12 meters wide and weighing 582 tons, is the largest fusion reactor superconducting magnet ever built, with 1.3 times the volume and three times the stored energy of comparable magnets in the International Thermonuclear Experimental Reactor. Sixteen such coils will eventually form a ring generating a 6.5-tesla magnetic field at the plasma center. During heat treatment of niobium-tin superconductors, a temperature deviation of just a few degrees can cause performance to collapse, and keeping temperatures uniform across a furnace holding coils more than 10 meters in size is itself a cutting-edge engineering feat. The BEST (Burning Plasma Experimental Superconducting Tokamak) is a compact, next-generation nuclear fusion device being built in Hefei, China, aiming to demonstrate actual deuterium-tritium plasma burning and generate the world's fi...

original. several DSO in one photo using astrometŗy to make annotated details so can use a full frame camera and a 135mm lens cosmos notes weixin

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in thirty years time. trifid nebula is ~ 5000 light years away from Hubble  universetoday adam block: universe within 5000 light years durham

formerly known as WFIRST     comparison orbit :L2 lagrange launch scheduled on 30 august, 2026 Liftoff of the Falcon Heavy rocket carrying the spacecraft is scheduled for 7:26 a.m. Eastern (11:26 GMT) from the Kennedy Space Center. scheduled to be ready(commission) by December 2026 spacenews hardware highlights from @tsuka_ken, google lens translated

  三月七日，沙湖道中遇雨。雨具先去，同行皆狼狽，餘獨不覺，已而遂晴，故作此。 莫聽穿林打葉聲，何妨吟嘯且徐行。竹杖芒鞋輕勝馬，誰怕？一蓑煙雨任平生。 料峭春風吹酒醒，微冷，山頭斜照卻相迎。回首向來蕭瑟處，歸去，也無風雨也無晴。 dugushushi 石鼓