The IDAS Hydrogen-Alpha family of filters allows astrophotographers to select an Hα filter optimally tailored to their equipment.
Features include:
- 6.8 nm bandpass (measured value 6.5 +/- 0.1 nm)
- 98% transmission (measured value)
- IR blocking out to 1200 nm
- 2.5mm and 3.0mm filter thickness options
- Configurations:
- 50.8mm for filter wheels (QHY/ZWO/Atik)
- 48mm and 52mm mounted
- Each filter is individually measured and inspected for quality
- 3 classes* available: STD, HS, UHS
- Made in Japan
The IDAS Ha-6.8 family includes 3 options – STD (Standard), HS (High Speed) and UHS (Ultra High Speed) with bandpasses adjusted to accommodate the f-ratio of different speed astrographs. In addition each class comes in two different glass thicknesses – 2.5 mm & 3.0 mm.
- STD – recommended for most regular scopes
- HS – ideal for the optics between F2.0 and F3.5 such as Takahashi Epsilon Series, RASA11, and standard camera lenses
- UHS – highly optimized for the optics for F2.2 or faster such as RASA8 and HyperStar Series
Prices are the same across the filter family regardless of the option selected. Filters are designed to fit in 50.8mm QHY, ZWO and ATIK filter carousels.
Reflection Test Sample:This test (200 second exposure) shows clean images of bright stars in the field, indicating good anti-reflection (AR) design.
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Another set of photos from the Orion belt region demonstrates the lack of reflection artifacts around bright stars.
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Examples from Bortle 8 skies (5-minute exposures):
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Also from Bortle 8 skies – Simeis 147
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| Thickness | 2.5mm, 3.0mm |
|---|---|
| Class | STD, UHS |
| Size | 50.8mm, M48 (2") Mounted, M52 Mounted |
Fast Shipping and Professional Packaging
Due to our longstanding partnership with UPS FedEx DHL as well as other major international carriers, we are able to provide various shipping options. Our warehouse personnel will pack each item according to our strict requirements. Before they are shipped, your goods will be thoroughly examined and secured. Everyday, we send to thousands of clients in different countries. This is a sign of our determination to become the largest online retailer globally. The warehouses and centers for distribution are in Europe, as well as the USA.
Note that orders containing more than one item will be processed according to the specific item.
Before shipping before shipping, we'll inspect thoroughly the items you've purchased. Most orders are delivered within 48 hours. The estimated delivery time is between 3 and 7 days.
Returns
The inventory is always changing and we do not fully manage it because of the fact that many parties are involved, including our warehouse and factory. Therefore, the actual inventory could change at any time. It's possible that your order will be unable to fill when you have placed the order.
Our policy is valid for 30 days. If 30 days have gone without a trace since the purchase and we are unable to offer an exchange or refund.
In order for your item to be returned it must be in its original packaging, unopened and in the same condition as when you received it in. It must also be in its original packaging.
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