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GSO 6" f/8 Parabolic Primary and 31mm Secondary Mirror Set for Telescope

GSO 6" f/8 Parabolic Primary and 31mm Secondary Mirror Set for Telescope

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1. PRODUCT DESCRIPTION

This set contains the following products:

  • GSO Parabolic Primary Mirror - 6" f/8
  • GSO Elliptical Secondary Mirror - 31mm (minor axis diameter)

Please note that only these two items are included. The other items referred to in the description and specification tables below or shown in the photos are sold separately.

For years, GSO has made dobsonian telescopes sold under various labels. Users of these scopes know the excellent quality of the optics included, and they have a well-deserved reputation for being the finest mirrors in their price range. We are now pleased to offer virtually the entire line of GSO's Newtonian optics in the US market.

GSO's parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. Ranging in aperture from 6” to 16” and offered in various f-ratios, these mirrors are made from optical grade BK-7 glass. All mirrors have a reflective aluminum coating with a reflectivity of 92-93%. The aluminum coating is protected by a silicon oxide (SiO2) over-coating. GSO's elliptical flat mirrors have the same high quality as their parabolic primary mirrors.

GSO uses high-volume, state-of-the-art, high quality manufacturing and test lines. GSO guarantees diffraction limited performance, but their mirrors typically have a mirror surface quality of 1/16 wave RMS at least, and often better. This very smooth mirror surface results in excellent optical performance with practically no light scatter.

Please Note:

Most parabolic mirrors will have 2-4 minor uncoated areas along the edge of the mirror. See photo 3 above for an example. These are caused by the clips used to hold the mirrors in the coating chamber. Note that these are not defects. A couple of these uncoated edge strips will typically be covered up by the clips in your mirror cell anyway.

Additional Information:

Q. Is a test report included with each mirror?
A. No. GSO tests each mirror via laser interferometry before shipping, but does not provide individual test reports.

Q. Is the primary center-dotted?
A. Sometimes yes but mostly no. It just varies from batch to batch.

You can easily center-dot the primary yourself if the mirror you receive is not dotted. Instructions to do this are readily available on the internet. If you want a center-dotting sticker, just request one from us at the time you place your order.

If you want a mirror that does not have this center dot, please check with us before your purchase. Removing the center dot is not easy or recommended. If the mirror already has a center dot but you do not want it, we recommend that you not purchase this item.

 

Specifications of GSO Primary Mirrors

Part NumberApertureFocal RatioMirror DiameterFocal LengthMirror ThicknessMirror WeightSuggested Secondary Size

AD096

6"

f/4

153mm

600mm

20mm

1lb-14oz (847g)

62.5mm

AD046

6"

f/5

153mm

750mm

20mm

2lb-1oz (941g)

50mm

AD045

6"

f/6

153mm

900mm

20mm

2lb (921g)

50mm

AD011

6"

f/8

153mm

1200mm

20mm

2lb (921g)

31mm

AD048

8"

f/4

200mm

800mm

24mm

3lb-15oz (1794g)

70mm

AD049

8"

f/5

200mm

1000mm

24mm

4lb-1oz (1831g)

62.5mm

AD082

8"

f/6

200mm

1200mm

24mm

3lb-13oz (1717g)

50mm

AD094

10"

f/4

250mm

1000mm

34mm

9lb-2oz (4126g)

88mm

AD081

10"

f/5

250mm

1250mm

34mm

8lb-9oz (3891g)

62.5mm

AD095

12"

f/4

304mm

1200mm

38mm

14lb-8oz (6574g)

88mm

AD017

12"

f/5

304mm

1500mm

38mm

14lb (6348g)

70mm

AD015

16"

f/4.5

406mm

1800mm

45mm

28lb-14oz (13092g)

88mm

Notes:
Actual measurements can vary by a little bit from all values shown above due to manufacturing variations.
Actual coated mirror diameter will be 2-3 mm less than the Mirror Diameter listed above.

 

Specifications of GSO Secondary Mirrors

Part NumberMinor Axis DiameterApprox. Major Axis DiameterApprox. ThicknessMirror Weight

AD041

28mm

38mm

5mm

0.3oz (9g)

AD012

31mm

43mm

8mm

0.7oz (20g)

AD064

46.5mm

65mm

10mm

2.1oz (60g)

AD007

50mm

70mm

10mm

2.3oz (65g)

AD047

62.5mm

88mm

12mm

4.5oz (128g)

AD091

68mm

95mm

15mm

6.7oz (190g)

AD009

70mm

97mm

12mm

5.5oz (156g)

AD092

74mm

104mm

16mm

8.2oz (232g)

AD093

80mm

114mm

18mm

11.5oz (326g)

AD037

88mm

122mm

20mm

14.5oz (411g)

AD018

104mm

145mm

17mm

18.2oz (515g)

Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above.

Description copyright: Agena AstroProducts - Reproduction without permission prohibited.

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