离岸价格
Get Latest Price50 ~ 360 / Piece
|1 Piece Minimum Order
国:
China
モデル番号:
H-Alpha 7nm
离岸价格:
50 ~ 360 / Piece Get Latest Price
ロケーション:
-
最低注文量の価格:
50 per Piece
最低注文量:
1 Piece
パッケージの詳細:
High-density carton, with protective sponge inside
納期:
Air/Express
供給能力:
20000 Piece per Month
支払いタイプ:
T/T, Western Union, PayPal
製品グループ :
China
連絡先担当者 Ms. Vivian
NO.8 Xinzhi Alley ,Middle Changyuan Rd, Kunming National High Tech, Ind Dev. Zone, Kunming, Yunnan
H-alpha 7nm filter is an extremely narrow emission-line filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.
The full width at half-maximum (FWHM) of 7nm is optimized for a maximum contrast between the (H-alpha emitting) object and the background. The contrast gain is much higher than with our *2nm emission line filters but you wont see as much stars in the resulting images.
The design of the transmission curve makes it possible to use the filters with instruments from 1:3.*5 to 1:*5. Selected filters for faster system are available upon special request.
Main use
The Optolong H-alpha-CCD (7nm version) increases the contrast between objects, in this case between the H-alpha emission line and the skyglow background in the same way as the *2nm version. The gain in contrast is much higher due to the smaller FWHM. The 7nm H-Alpha filter is the right choice for extremely dim objects, even in the milkyway, and for observations from heavily light-polluted places. The Optolong 7nm H-alpha-CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow.
Other uses
Using the Optolong 7nm H-Alpha together with the *2nm H-Alpha gives you the ability to have a maximum contrast in the HII objects and to keep the stars in the final image.
The Optolong 7nm H-Alpha filter may NOT be used for solar observation.
Alternatives
If you plan to do (false-)color imaging with other emission line filters, you should get our filters with *2nm FWHM. Images taken with filters with differing FWHM are very difficult to combine into the final image.
Photographic Filter | Visual Filter | Size |
UHC CLS CLS-CCD LRGB O-III H-Beta ND2~***0 SII-CCD *2nm NII-CCD 7nm H-Alpha 7nm/*2nm Night Sky H-Alpha Single Polarizer Filter Variable Polarizer Filter |
UHC CLS O-III H-Beta H-Alpha *0nm Moon & Skygolw Filter Single Polarizer Filter Variable Polarizer Filter |
1.*5 2 φ*6 |
国: | China |
モデル番号: | H-Alpha 7nm |
离岸价格: | 50 ~ 360 / Piece Get Latest Price |
ロケーション: | - |
最低注文量の価格: | 50 per Piece |
最低注文量: | 1 Piece |
パッケージの詳細: | High-density carton, with protective sponge inside |
納期: | Air/Express |
供給能力: | 20000 Piece per Month |
支払いタイプ: | T/T, Western Union, PayPal |
製品グループ : | Astronomy Filter |