Product Details
About the straight-through BF30 Blocking Filter:..
A blocking filter is a secondary interference filter which mounts at the eyepiece end of the telescope. You must use this filter in conjunction with the front narrowband element (SolarMax II 90)....either component cannot be used alone. The straight-through BF30 is specifically optimized to produce a full disc image on telescopes with a focal length of up to 3000mm. It is a 2" straight-thru unit.
About the RichView Tuner...
Some events on the sun, notably active flares and coronal mass ejections (CME's), are extremely fast-moving. If such features occur on the disc of the Sun, their high velocity towards the observer results in their wavelength being Doppler-shifted shorter than Ha. If the velocity is high enough, this wavelength could be outside the passband of the filter and the feature would not be observable. The RichView allows the user to de-tune the SolarMax II slightly to bring such phenomena into better visibility. The RichView fits between the SolarMax II and its adaptor plate. A simple rotary wheel movement accomplishes the tilt necessary to move the passband of the filter. Because of the filter position at the front end of the telescope, this does not compromise the performance of the filter nor limit the Ha field of view as is the case with rear-mounted filters.
Below you'll find a list of explanations regarding important accessories that may be required for this product. To add them to your order, just click on the "Accessories" tab and choose the appropriate items.
Important Note: OPT highly recommends a 2nd Day Air shipping upgrade on this product. Please read Coronado's new Shipping Policy (PDF, 60K) for important information regarding this recommendation...your choice could affect the manufacturer's warranty!
specifications
Aperture | 90 mm (3.54") |
Bandwidth | <0.7A |
Blocking Filter Barrel Size | 1.25" |
Emission Line | Alpha |
Filter Type | H Alpha |
Free Shipping | Yes |
Optimized For | 600mm & Under |
Size | 1.25" |
Warranty | 1 Year Warranty |
Wavelength | <0.7 A |