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OPTOLONG 1.25" 25nm O-III Filter Suitable for Visual Observations of Emission Nebulae, Planetary Nebulae

Product Description

This Optolong OIII filter has a FWHM of 25nm, making it suitable for visual observations of most emission nebulae, planetary nebulae, and supernova remnants with a telescope of at least 6-8”. The OIII broadband filter increases the contrast between the background sky and these objects, so it will also help with observations of bright nebulae, such as the Great Orion Nebula, M42, from light polluted skies. Fainter objects require nights of good seeing and reasonably dark skies for best filter performance. This filter just might allow you to see objects that you'd otherwise miss.

Quality Filter Materials:

  • CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading
  • Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
  • Surface quality, according to MIL-O-13830, is 60/40
  • 90% transmission at 495.9nm and 500.7nm
  • 0.1% transmission Hg at 435nm and 578nm
  • 0.1% transmission Na at 589nm
  • High value transmission of pass-band and optical density of off-band is assured through Optolong's planetary rotation system, a homogenous and precise coating procedure
  • Thin metal cells have a clear aperture of 26mm for 1.25" filters
  • Each filter comes with a plastic case with high pressure EVA case lining

Package Includes

  • 1.25" OPTOLONG O-III Filter

 

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Delivery details
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Delivery details

Processing time:as the item description.

  • We will prepare the shipment in 48-72 hours(Sundays and holidays excepted. )after we receive the payment and after the eCheck is cleared.
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    to provide you the most reliable, affordable way of shipping service.
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Custom fee
(including VAT&GST):

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A:Overseas Warehouse Local Dispatch

  • From US Local Dispatch: USA: 2-6 business days , other countries: 5-14 business days.
  • From UK Local Dispatch: UK: 1-5 business days , other countries: 3-8 business days.
  • From DE Local Dispatch: Deutschland: 1-3 business days , other countries: 2-5 business days.
  • From AU Local Dispatch: AU:2-6 business days.

B: China Domestic Dispatch

Delivery Time

Country
Working Days(not including holiday)
5-7
8-11
12-14
15-19
20-22
>22

Working Days+Saturday+Sunday
5-9
10-15
16-20
21-25
26-30
>31

United Kingdom
Rate(item arrived)
9.9%
63.2%
19.1%
3.4%
4.4%
Refund

Australia
Rate(item arrived)
21.4%
50%
14.3%
7.2%
7.1%
Refund

France
Rate(item arrived)
10.5%
28.6%
43.8%
10.1%
7%
Refund

Germany
Rate(item arrived)
11.1%
22.2%
30.3%
20.9%
15.5%
Refund

Canada
Rate(item arrived)
0%
47.1%
31.4%
17.6%
3.9%
Refund

Spain
Rate(item arrived)
3.5%
25%
47.9%
12.9%
10.7%
RefundYou can pay extra shipping cost to get express delivery, such as EMS, DHL or UPS. It just takes about 5-10 business days to receive order, please contact us if necessary.

Returns

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  • If you want more items or make wholesale order, feel free to contact us. We will offer you a good discount!

    PushAuction

    On May-17-18 at 00:59:29 PDT, seller added the following information:

    DataCaciques

    Filed under: Eyepieces & Accessories