More on flat making
More information on flats; grinding a flat and and how you can use (in some cases) the water test without using a collimating lens. A large collimating lens may be hard to find.
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Russian Optical Flat Testing
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Using Polishing Pads to Clear the Back of a Telescope Secondary Mirror
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How to make Very Flat Optical Surfaces on Glass
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Reading Optical Flats Part 1
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Making a Spectrascope
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Very cheap unique wavelength light for using with Optical Flats... Using a 532nm. 50mw LED laser
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Making a Mirror with a Variable Surface Shape
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The Strange Story of the Bird-Jones Telescope (One Designer Was Blind!)
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Curve Generating medium size lenses or mirrors
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DIY Carbon Fiber Telescope Tube
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How did they make this in the 1800's?!
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Flat From Scratch, revised - The 3 plates method
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PRECISION GROUND TOOLROOM STONES
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How to Make a Pitch lap and Polish a telescope mirror!
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Measuring the flatness of a surface with a laser and a webcam to microns over large surfaces.
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Parabolizing a 12 inch F/7.6 parabolic mirror
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Lapping It Up: Setting up for precision hand lapping
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Making a Fizeau Interferometer
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My Zeiss grinding and polishing machine
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