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Here are some of the optical elements i have to work with:
The 15 inch mirror is a light-weight aluminized plastic about 1/8th inch thick and rough spherical shape. It has a short focal length and suffers from spherical aberrations and other mishaped areas leading to a larger than theoretical focal spot size. diameter = 381mm, focal length = 247mm (f:0.64) *field of view with different detector sizes: Size -- FOV in degrees 1mm 0.23 2mm 0.46 3mm 0.69 4mm 0.92 5mm 1.15 10mm 2.31 |
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11 x 8.5 inch fresnel lens. A cheap dime store page magnifier.
I'm using this for my xenon strobe transmitter.
diameter = 265mm x 200mm, focal length = 330mm (f:1.24 x 1.65) *field of view with different detector sizes: Size -- FOV in degrees 1mm 0.17 2mm 0.34 3mm 0.52 4mm 0.69 5mm 0.86 10mm 1.73 |
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8 inch F7 parabolic reflector. My favorite astronomical telescope on an alt-az Dobsonian mount.
diameter = 203mm, focal length = 1421mm (f:7) *field of view with different detector sizes: Size -- FOV in degrees 1mm 0.04 2mm 0.08 3mm 0.12 4mm 0.16 5mm 0.20 10mm 0.40 |
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5 inch double convex lens from an old overhead projector, with some edge chips and scratches.
diameter = 127mm, focal length = 330mm (f:2.59) *field of view with different detector sizes: Size -- FOV in degrees 1mm 0.17 2mm 0.34 3mm 0.52 4mm 0.69 5mm 0.86 10mm 1.73 |
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2 inch achromatic lens doublet from an old pair of binoculars.
Currently using this to aim my xenon strobe transmitter.
diameter = 50mm, focal length = 162mm (f:3.24) *field of view with different detector sizes: Size -- FOV in degrees 1mm 0.35 2mm 0.70 3mm 1.06 4mm 1.41 5mm 1.76 10mm 3.53 |
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2 inch achromatic doublet from a cheap refractor telescope.
diameter = 50mm, focal length = 600mm (f:12) *field of view with different detector sizes: Size -- FOV in degrees 1mm 0.09 2mm 0.19 3mm 0.29 4mm 0.38 5mm 0.47 10mm 0.95 *FOV in degrees = 57.3 / focal length in millimeters x detector size in millimeters |
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