Baader 3.5 / 4nm f/3 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II)
- Baader H-alpha / O-III / S-II f / 3 Ultra-Highspeed Filter Set – Premium Grade
- 3.5 / 4 nm half width (to harmonize the exposure time of H-alpha with O-III / S-II), recommended for extremely fast optical systems from f/3.4 to f/2.3
- Specially designed for the special filter requirements when used with fast f/3 optics
- Enables the highest contrast even with the strongest light pollution, minimizes the size of the stars, makes the finest nebula details accessible – indispensable under Bortle 9/8/7/(6) sky
- Reflex-Blocker ™ hard-coated and optically polished – with sealed coating edges (Life-Coat ™)
- Blackened edges all around, with a filter front indicator in the form of a black outer edge on the front
- Optimized for modern CMOS cameras, but ideally suited for CCD camera technologies
The new generation of Baader CMOS-optimized filters features:
- CMOS-Optimized Baader Filter
- Increased contrast
- Ever more narrow passbands
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
- FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratio
- Identical filter thickness to existing standards, with utmost care for parfocality
- Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
- Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed read more)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Technical Specifications
| MANUFACTURER | Baader Planetarium |
|---|---|
| SUITABLE FOR F/RATIO | < f/2.3 |
| TRANSMISSION RANGE | H-alpha / O-III / S-II |
| FILTER THICKNESS (WITHOUT CELL) |
2 mm Thickness = 1.25″/ 2″ / 31mm / 36mm 3mm Thickness = 50.4mm / 50×50 / 65×65 |
| HBW (HALFBANDWIDTH) | 3.5 nm (H-alpha) / 4 nm (O-III / S-II) |
| CWL (CENTRAL WAVELENGTH) | 656,3 nm / 500,7 nm / 671,7 nm |
| AR-COATING | Reflex-Blocker™ hard coated, planeoptically polished |
| SPECIAL FEATURES | CMOS-optimized with Life-Coat™ |
| FILTER SIZE | Multiple |
| FILTER USAGE | CMOS, CCD, H-alpha, O-III, S-II |
| FILTER MOUNTED | Mounted (LPFC 6mm) / Unmounted |
| TYPE OF FILTER | f/2 Ultra-Highspeed |
| SINGLE OR SET? | Singles and Filter-Set |
| FILTER SHAPE | round / square (depending on size) |
In the Box
- Baader 3.5 / 4nm f/3 Ultra-Highspeed Filters
Warranty & Manuals
Baader Limited Lifetime Warranty
| Filter Usage | OIII (4nm) |
|---|---|
| Filter Size | 2" |
Quick Shipping and Professional Packaging
Our long-standing relationships with UPS FedEx DHL and other carriers around the world gives us the ability to provide an array of shipping services. Our warehouse personnel are well trained and will be able to pack the items according to our precise and exact specifications. Before shipping your items will be carefully inspected and secured. We ship to thousands clients every day from all over the world. This shows our commitment to becoming the largest online retailer on the planet. We have distribution centers as well as warehouses in Europe and in the USA.
Orders with more than 1 item are assigned processing periods for each item.
Prior to shipment before shipping, we'll inspect thoroughly the items you have ordered. Most orders are shipped within 48 hours. Expected delivery times are between 3-7 days.
Returns
The inventory is always changing, and cannot be fully controlled by us because of the involvement of many different parties, such as the factory and our warehouse. Stock levels can fluctuate at any given time. Please understand it may happen that your order may be out of stock after your order has been made.
Our policy lasts thirty days. If it's been longer than 30 days since you made your purchase and we're unable to offer you a full refund or exchange.
To be eligible for return, it must be unopened and in the condition you received it in. It should also be returned in its original packaging.
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