Aluminising & Optical Testing (Updated 22th June 2005)
All prices are inclusive
of VAT and delivery unless otherwise stated
| Vacuum Coatings Scientific Mirrors | |
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Aluminising & Optical Testing (Updated 22th June 2005) |
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ALUMINISING | |
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Prices quoted are for double aluminising and silicon over-coating. Please state clearly with your order if you do not require your mirror to be over-coated (there is no price difference). If your mirror is being sent for a re-coating, there is no charge for the removal of old aluminium coats. |
| Newtonian Flats (listed by Minor Axis) | |||
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| Minor Axis | Price | Minor Axis | Price |
| 1" - 1.5" | £6.00 | 3" | £12.00 |
| 1.6 - 2" | £7.00 | 3.5" | £14.00 |
| 2.1 - 2.25" | £8.00 | 4" | £16.00 |
| 2.3 - 2.5" | £9.00 | 4.5" | £18.00 |
| 2.6 - 2.9" | £10.00 | 5" | £20.00 |
| Circular Mirrors | |||
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| 3" | £15.00 | 8.5 - 9" | £40.00 |
| 4" | £18.00 | 10" | £50.00 |
| 4.5" | £20.00 | 11" | £55.00 |
| 5" | £25.00 | 12" | £60.00 |
| 6 - 6.25" | £30.00 | 14" | £68.00 |
| 8" | £38.00 | ||
| Larger circular mirrors with standard thickness up to approximately 1 3/4 inches: | |||
| 16" | £75.00 | 22" | £120.00 |
| 18" | £90.00 | 24" | £140.00 |
| 20" | £100.00 | 30" | £160.00 |
| Larger circular mirrors with greater than two inches thickness: | |||
| 16" | £85.00 | 22" | £140.00 |
| 18" | £95.00 | 24" | £180.00 |
| 20" | £120.00 | 25 - 30" | P.O.A. |
| Remember - we also provide a re-coating service for camera mirrors and prisms. We can only coat these once they are removed from your camera. Please contact a camera specialist if uncertain. Prism re-coats are £20 incl. p&p. Mirror re-coats/re-makes are £12 incl. p&p. | |||
| All prices do not include return postage | |||
| Post & packing charges are as follows and are for main mirrors with or without optical flats, returned via insured post or insured carrier. | |||
| 5" max | £5.00 | 8 1/2" - 12" | £16.00 |
| 6" | £8.00 | 14" - 16" | £18.00 |
| 8" | £14.00 | 18 - 20" | £25.00 |
| Mirrors larger than 20", carriage prices on application. | |||
| For small individual items post & packing is £3.00, this applies to flats up to 2.5" minor axis. | |||
| Optical flats 3 - 5" post & packing is £5.00 | |||
| Please see our packing notes on how to pack your mirror safely on our Contact Us page - or click HERE | |||
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OPTICAL TESTING SERVICE | |
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V.C.S.M. offers an economical service for amateur astronomers, wishing to ascertain the working quality of an optical system or component. This will be specified as a suitability guide for the intended purpose of use and a statement of actual optical quality in comparison to a 'perfect ' system. |
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Test method for Newtonian Optical Flats | ||||
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Optical flats will be tested against a reference flat. This will determine their accuracy in wavelengths of light by the interference fringes shown. Flats will also be tested by auto-collimation against a spherical mirror to determine image quality and detect astigmatism. Flats mounted on holders can often be distorted by poor glueing methods. This test will prove the quality of the mounting system, before the flat needs to be dismounted and tested separately. | ||||
| Test method for Primary Mirrors, including Cassegrain systems and Object Glasses | ||||
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Optics
are tested by auto-collimation against a perforated 20 inch diameter
optical reference flat. Newtonian mirrors are placed such that light from
the test source radiates from behind the flat, through the central
perforation and on to the mirror being tested. This in turn reflects the
light in a parallel beam onto the test flat, which returns it for
re-focusing by the mirror being tested, back to the tester behind the
flat. Double reflection by the mirror being tested greatly enhances any
deviations from true. With Cassegrain systems and object glasses, the
light source is placed at the focus of the system again, but with the
optics and the tester facing the test flat .Again light passes twice
through the optics being tested with subsequent enhancement of any optical
faults. | ||||
| To test Newtonian mirrors to |
12" diameter £10 |
14" to 20" diameter £20 | ||
| To test Cassegrain systems to |
12" diameter £20 |
14" to 20" diameter £30 | ||
| To test Object Glasses |
4" diameter upwards, to a max. focal length of 84" £12 |
Over 84" to a maximum of 144" £16 | ||
| To test Optical Flats |
max. minor axis 6"
£8 | |||