Products in the Same Family
Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
Stress Free, Secure Transactions
You can trust purchasing and delivery with All-Star Telescope. All of our transactions are 100% secure and Level 1 PCI DSS compliant thanks to Shopify's ShopPay platform. For additional protection, we insure 100% of the value of every shipment we make. If it get's lost during shipment, we replace it. If it gets damaged during shipment, we replace it. We make sure your product arrives exactly as you would expect it to; we promise.
We also ensure privacy protection. We never keep any of your credit card information on file and any of your personal data is stored according to our policies.
30 Day Return Policy
Buy with confidence knowing that we accept returns up to 30 days after purchase. We want you to have something you will actually use and we are confident that we keep good quality products in our store with No Junk.
Price Match Promise
Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
Product Description
This 3nm dual narrowband (H-Alpha + OIII) filter features an ultra-narrow FWHM bandwidth of only 3±1nm, which efficiently filters out background stray light. Combined with a wide cutoff wavelength range of 300-1050nm (covering ultraviolet to near-infrared spectra) and an average OD5 transmittance as low as 0.001%, it strongly suppresses light pollution and stray light, significantly improving the signal-to-noise ratio (SNR). Meanwhile, its high transmittance performance of over 85% greatly reduces exposure requirements. Even in heavily light-polluted urban environments, it enables fast capture of deep-sky objects. In addition, it adopts multi-layer minimal halo coating design, which effectively reduces glare and halo interference, enhances image contrast and color accuracy, improves the purity of deep-sky photography images.
What's in the Box
Specifications
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Product specification
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1.25 inches
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Mirror ring size
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Φ31.75x7mm
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Thread Type
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Single Thread/Male Thread
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Thread Specifications
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M28.5*0.6
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Material
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6061T aluminum profile
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Substrate Thickness
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2.0 mm
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Aperture of light transmission
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26mm
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Center Wavelength
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500.7/656.3 nm
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Bandwidth/FWHM
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3±1nm
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Cutoff wavelength
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300-1050nm
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Cut-off depth
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average OD5
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Surface quality
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60/40
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Surface flatness
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transmitted wave front PV≤λ/4a
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Parallelism
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30″
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Net weight
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7g
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Additional Articles, Videos, and Links
Astrophotography for Beginners Step 4: Shooting Deep-Sky Images
Taking deep sky pictures can be daunting, luckily there is an easy process to follow to allow you to get great shots! Here is the typical process for actually taking deep-sky images in the field.
Astrophotography for Beginners Step 3: Choosing Gear for Deep-Sky Imaging
Using a star tracker gains you experience with the fundamentals of deep-sky imaging. Shooting the Moon gains you experience focusing and framing through your telescope. Through your sessions you’ll...
Astrophotography for Beginners - Start Here: Getting into Astrophotography Step by Step
Shooting the night sky has never been more popular, nor easier. The choice of equipment has also never been better, or more affordable. However, as per the advice given by Dickinson and Dyer in the...
Astrophotography for Beginners Step 1: Using the Star Adventurer Tracker
By far the most economical and easiest way to capture beautiful images of the Milky Way and large deep-sky objects like the Andromeda Galaxy (shown here) is to use a star tracker. Here are steps an...
Astrophotography for Beginners Step 2: How to Shoot the Moon
Close-ups of the Moon are rewarding, and an easy way to learn to shoot through your telescope. While good results are possible with a phone camera clamped to an eyepiece (as shown below), this tuto...