OPTOLONG 1.25" H-beta Filter Nebula Filter for Astronomical Deep Sky Photography
Items Description
Narrowband
H-beta filter is designed for nebula observation allowing 25nm
bandwidth of light centered on a wavelength of 486nm through, and
reducing the transmission of certain wavelengths of light, specifically
those produced by artificial light including mercury vapor, and both
high and low pressure sodium vapor lights and the unwanted natural light
caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
H-beta emits 486nm and it is a blue-colored filter.
Main Use and Performance:
- Use with a large aperture telescope under clear and dark viewing conditions with good seeing.
- Suitable for viewing on the faint and elusive Horsehead Nebula and California Nebula.
- Narrowband
filter do not eliminate the effects of light pollution or increase the
object's brightness. In many cases, they increase the contrast between
nebula and night sky, not brightening the nebula.
Technical Data:
- Schott substrate material
- Thickness 2.0 mm
- Surface Quality: 60/40 (Refer to MIL-O-13830)
- Fine-optically polished to ensure accurate 1/4 wave front and< 30 seconds parallelism over the both surfaces
- 90% transmission at H-beta line 486nm
- 0.1%
transmission of off-band, specifically the major emission lines of
artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).
Transmission of 0.1% is equivalent to OD3 (Optical Density), and a high
optical density value indicates very low transmission, and low optical
density indicates high transmission.
PLS
NOTE: THE FILTERS OF OPTOLONG ARE NOT DESIGNED FOR SUN OBSERVATION. DO
NOT LOOK AT THE SUN WITH OPTOLONG FILTER. YOU WOULD BE BLIND IF YOU FAIL
TO OBSERVE THE WARNING.
Package Include:
- OPTOLONG 1.25" H-Beta Filter
- Sturdy Plastic Case
- Shipping
- Payment
- Feedback
- Returns
- Contact us
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- Processing time:
- We will prepare the shipment in 48 hours after we receive the payment and after the eCheck is cleared.
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- B:Chinese Domestic Dispatch
| Country |
Delivery Time |
| 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% |
Refund |
- You can pay extra shipping cost to get express delivery, such as EMS, DHL or UPS. It just takes 3-7 business days to receive order, please contact us if necessary.
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