All-Star Telescope Canada - For All Things Astro!
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Products are usually delivered in 3-7 days.
Products usually ready for pickup from Edmonton Warehouse between 2 and 3.
Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia H-alpha 3nm Pro filters are designed to deliver 88% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.
Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T>88% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR(signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.
Great service, and seems like a great filter.
Just a little thing I would improve : when ordering, I chose the UPS air 2nd day. I received my order +8 days later.
Otherwise, everything is amazing!
Works very well, the Crescent Nebula pops right out with ten minute shots. VERY well packaged, fancy case and all. Just be aware of any sticky gum material that may transfer to your fingers/gloves while opening.
We love to help you find just the right thing! We never try to sell you more than you need, in fact it's a policy!