00:00Need real optical glass on budget?
00:02Most cheap prisms junk
00:04Clouded plastic, weak refraction
00:07Tested real gear
00:09Found best options for cheap optical prisms that actually bend light without ruining beam
00:15First up, 25mm K9 isosceles right angle triprism
00:20$4.01 pure K9 glass, not acrylic
00:24Throws razor-sharp rainbows across room, zero chromatic aberration where unwanted
00:30Over 4,000 sold, 4.8 stars
00:34Unbeatable entry point for physics demos or lens flares
00:38Next, 10-pack copper-coated corner cube retro reflectors
00:41$8.23 total
00:45Beam hit face, bounce straight back to source within 5 arc seconds
00:49Copper backing keep reflection efficient, no light bleed
00:54Insane value for laser alignment projects, LiDAR builds, or surveying rigs
00:58Third, K9 right angle prism with blackened sides and internal 45-degree reflective coat
01:04$8.12
01:07Comes in multiple sizes from 5 to 30mm
01:11Blackened edges kill internal scatter and stray glare
01:14Best pick for custom camera rigs or tight periscope optics
01:19Fourth, naked 25mm 90-degree right angle prism
01:24$6.06
01:27Simple, zero coatings, perfect 90-degree beam bounce through total internal reflection
01:32Flawless 5-star rating from over 2,000 buyers
01:36Rock-solid tool for basic benchtop setups or beam steering
01:40Last, premium batch of 10 copper and silver-coated corner cubes
01:45$9.53
01:48Similar to earlier set, but dual-layer silver-copper finish give higher reflectivity across wider
01:53wavelengths
01:55Return beam hold tight at 5 arc seconds
01:57Great if need spares for high-power laser arrays
02:01All links in description below
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02:08Tell me in comments what optics to test next
