Contact our Sales Team by Email: sales@orionoptics.co.uk or Telephone: 01782 614200

TERMS & CONDITIONS | FIND US | YAHOO GROUP

socialicons2socialicons2asocialicons2b

item3

SEARCH

homeicon

Shop Details
Prices exclude VAT

mirrorrecoating
arrow1

Back to previous page

Information
You will find a recoating price guide and and an A4 Printable PDF Form to return with your mirror(s) at the bottom of this page.

One of the most important and very widely used services we offer is the re-coating of established or, coating of newly made mirrors. This service we offer is taken up from every corner of the globe as it offers both added reflectance qualities to mirrors, over and above what most other companies can offer and, a vastly extended lifespan of the reflective surface if care is exercised in looking after the coating.

For this service we offer Hilux as standard as it is so widely accepted in all astronomical circles as being one the best if not the best system available anywhere using aluminium as the reflective component of the optical stack. Stack is the technical term used to describe the multi layers of dioxides etc and the aluminium which are applied under vacuum to the mirror’s surface to produce a high quality reflective coating.

Some important points to consider when shipping a mirror(s) to us for re-coating.

Mirrors can be sent to us for re-coating whilst still attached to their adaptors/mounting plates etc. Because of the nature of the equipment used in coating a mirror we have to remove these parts for two reasons:

These are the two main reasons we have to remove everything attached, even a thin layer of glue or silicone rubber can ruin the process and damage the oil.

If you are able to remove all attached parts and any residual glues, paints, resins etc, we can then immerse the mirror in the ‘stripping solution’. If you are unable to remove these ‘attachments’ and adhesives etc, we can do it for you. It is not possible in the space allowed here to look at all alternative and options of these attachments and resins etc which we have to initially mechanically remove then use several different solvents to remove the enormous number of adhesive variants.

We can also, if so requested, re-mount your mirror(s) on their supports/attachments for you. Because of the hundreds of combinations it is not possible to display all these alternatives so, if you do wish us to carry out this function, please tick the box shown on the table and include a printed version when you send in your mirror(s) and we will contact you with details of costs involved.

We take the best possible care when coating a customers mirror and on arrival in our coating lab we carry out a thorough check of the mirror(s) you have sent us. We look for many aspects of the mirror’s condition and also whether there may be a problem with the newly coated surface we apply.

Some mirrors we receive have been kept is wet conditions or conditions where moisture occasionally condenses on the optical surface and stays for hours, sometime days. This is one of the biggest problems which cause degradation of the reflecting surface. The moisture gradually seeks out microscopic pin holes in the top protective layer of a mirror’s coatings and begins, ever so slowly, to attack the aluminium underneath this layer. Over the years, this action can also attack the glass but to a far lesser extent. However, glass needs very little attack to loose a little of it’s polished finish.

When we first examine a customer’s mirror we look to see if this reaction may have occurred and if it is likely it has, we then advise the customer that he may have a flaw in the surface. By flaw we mean an area which, when re-coated with new Hilux, will look slightly duller than far larger surrounding highly reflective areas of the mirror. Let me stress, this is quite rare but, we do find a dozen or so examples every year from around several hundred re-coats we carry out. We give the customer the option as to whether to cancel the coating process or, go ahead and hope the problem is minimal, which in most cases, it is

Unfortunately, there are one or two cases a year when there is very little sign of any attack on the mirror’s surface and we consider that it will coat to a virtually perfect reflecting mirror. The problem is that when coated, we come across areas which are slightly duller which, were impossible to detect in it’s original condition or when the old coating was stripped off. Let me stress, this is a rare occurrence but, it does happen, even after we have given the mirror the most stringent visual tests prior to coating. The dulling of the surface in these rare instances is usually very limited and detracts only from the mirror’s appearance, it has little or no effect on the mirror’s overall performance. The only way to remove this attack on the mirror’s surface if it is very noticeable and which may detract from it’s performance, is to re-polish and re-figure the mirror. This is usually very expensive and in some instances not possible.

We examine customer’s mirrors but, it is not possible to be 100% correct in all our assessments as to the finished, re-coated quality of a mirror’s surface.

Elip1Elliptical Mirrors should be measured across the Minor Axis as shown - example shows a measurement of 50mm

Allow me to clear up a misconception some customers may have. Nearly all the mirrors we receive are several years old and have a few scratches, hair like marks (sleeks) on the surface or general dullness, especially round the edge of the mirror. These faults, if in the actual old coating on the mirror, will be removed during the stripping and re-coating process. However, if these marks, regardless of how thin, small or slightly dull areas (not completely polished glass) Hilux, or another coating for that matter, will do nothing to either ‘fill it in’ or ‘cover it up’. The reason is Hilux will faithfully reproduce the form of the mirror’s surface, warts, bumps, scratches, micro grinding pits and every other thing which can occur on a glass surface. Please do not think that a scratched or damaged surface can be magically removed by re-coating, they won’t. In reality, because these marks may have been somewhat ‘camouflaged’ and hidden amongst the old, somewhat rough looking reflective surface, they may appear even more distinctly when re-coated due to the much higher reflectivity showing them up more clearly. Having said that, a newly coated Hilux mirror is a joy to behold. Even a few scratches, sleeks or other blemishes are completely insignificant when compared with the massive increase in light being reflected from superb multi layer Hilux coated surface.

recoatform

NOTE: When we coat new mirrors and re-coats alike, the thickness of the aluminium layer and the enhancing layers of Hilux coatings are measured to within a few angstroms to give peak performance. The aluminium layer in particular is kept as thin as possible to avoid the slightest chance of producing a slight difference in thickness and possibly overall accuracy of the reflective surface. This process is checked regularly as described on our web site but we always err on the side of caution.

Keeping the thickness to a minimum has the effect of allowing a small fraction of a percent of light to pass through the aluminium, whilst still ensuring the overall efficiency of the coating lies in the 97% region of the visual and photographic spectrum. This very small and insignificant amount of light can be seen with the naked eye if a mirror is held upagainst a bright light, the very small amount of light is still sufficient to be able to see some bright objects through the coating. This is quite normal and it shows the coating process is working in it's most efficient way possible by ensuring the reflective performance is above excellent and, there are no irregularities in the coating which could cause a problem.

imgalbutton

Circular Mirrors (Dia in mm)

Price Ex. VAT

Shipping Cost

Elliptical Mirrors (mm)*

Price Ex. VAT

Shipping Cost

50 - 60

25

5

15 - 20

13

4

61 - 75

32

6

21 - 25

18

4

76 - 90

36

6

26 - 30

20

4

91 - 110

44

8

31 - 36

25

4

111 - 130

51

9

37 - 44

30

4

131 - 160

64

12

45 - 50

33

5

161 - 180

73

14

51 - 60

37

5

181 - 200

86

15

61 - 75

50

6

201 - 250

106

20

76 - 90

58

7

251 - 300

124

25

91 - 110

63

8

301 - 350

142

30

111 - 130

79

9

351 - 400

169

35

131 - 160

97

10

401 - 450

179

55

161 - 180

118

14

451 - 500

216

60

* See note above about Elliptical measurement

501 - 600

273

80

FREE Shipping on Ellipticals if sent with Circular Mirrors

OPTICS : Telescope Mirrors : Elliptical Flats : Mirror Cells : Zygo : Optics Finish Note : PV Explained
Mirror Recoating : All About Optics : Optical Coatings : Optical + Telescope Testing

service
oouklogo1

NEWSLETTER SIGNUP

testimonials