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Elliptical secondary mirrors of the highest quality

hilux1hiluxdiagram1All our secondary Elliptical flats are available to buy here online (see bottom of this page) and are coated with Hilux coatings. The top part of the diagram opposite shows a highly magnified but not to thickness scale of light travelling through Hilux and being reflected off the aluminium layer. The left green arrow shows that perpendicular light (almost identical to the light striking a primary telescope mirror) is reflected almost along the exact line it struck the mirror. The majenta arrow shows the distance the light travelled (twice the distance shown) under this method. Compare this with the right hand side of the diagram which shows the much longer distance light has to travel through the Hilux multilayers when struck under the circumstances occurring when light strikes the secondary elliptical mirror in a Newtonian type telescope.The light travels around 40% further overall because of this effect. Because of this, the actual layers of Hilux have to be significantly reduced to enable the Hilux layers to operate at maximum performance. if the layers were not reduced, i.e. they were coated as in a normal telescope mirror, as most other companies coat, the performance is significantly reduced. This does not only apply to Hilux, it applies to every coating on mirrors used at 45 degrees as in Newtonian type telescopes.So if your secondary has not been coated in this manner, your telescope is not working to it’s maximum and can be improved if coated properly, especially with Hilux.

EliponlyAll sizes, up to 82mm are made from standard 10mm thick glass for stability.

90mm upwards are made from Pyrex glass. 
90-130mm are 15.5mm thick 
140mm-170mm are 20mm thick.

Custom sizes are available on request please ring or email sales@orionoptics.co.uk
to receive a quote

All the elliptical secondary mirrors listed here are of adequate quality to ensure there is no degradationin image quality even in the most accurate primary mirrors.Typical accuracies are up to 1/6PV surface.

Elliptical Secondary Mirrors (Flat) - Click on a price to buy

Minor axis mm

Major axis mm

Thickness mm

Material

Price exVAT

35

49

10

Plate

42

44

62

10

Plate

50

50

71

10

Plate

60

63

89

10

Plate

90

75

106

10

Plate

114

82

116

10

Plate

144

90

127

15.5

Pyrex

198

100

141

15.5

Pyrex

234

110

155

15.5

Pyrex

258

120

169

15.5

Pyrex

282

130

183

15.5

Pyrex

312

140

197

20

Pyrex

432

150

212

20

Pyrex

630

160

226

20

Pyrex

912

170

240

20

Pyrex

1020

 

 


 


 

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OPTICS : Telescope Mirrors : Elliptical Flats : Mirror Cells : Zygo : Optics Finish Note : PV Explained
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