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Accessories - Astrodon Unmounted Gen2 E-Series Individual Blue Filter
Accessories - Astrodon Unmounted Gen2 E-Series Individual Blue Filter
Accessories - Astrodon Unmounted Gen2 E-Series Individual Blue Filter
Accessories - Astrodon Unmounted Gen2 E-Series Individual Blue Filter

Astrodon Unmounted Gen2 E-Series Individual Blue Filter

Vendor
Astrodon
Sale price
$242.00
Regular price
$302.00 You save 20%
Unit price
per 
Use code "TAKE5" at checkout for 5% off all orders | Ends:
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Availability:

Estimated Arrival: Between Jun 19 and Jun 25. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.

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Astrodon LRGB Gen2 E-Series Tru-Balance Filters have revolutionized CCD imaging. Their popularity is due to their ease-of-use, high optical throughput and great resulting colors for galaxies, star clusters and nebulae.

E-Series filters are designed to approximately equalize the flux of red-sensitive full-frame (formerly Kodak E-Series) CCD detectors, including compensation for the solar photon flux. This means that your RGB color combine weights will be approximately 1:1:1 within perhaps 10% for equal length exposures.  This can never be perfect, but it does allow you to take one exposure time for all of your RGB data and therefore, only just one corresponding dark exposure time.  Again, this saves you precious imaging time and thus, simplifies your imaging.

Features:

  • Set includes Luminance (NIR/UV-blocked colorless), Red, Green and Blue filters
  • 1.25″ mounted, 31, 36, 49.7 mm dia, 49.7 mm square (36 mm filters will not exceed 36.1 mm dia.)
  •  3 +/-0.025 mm single 1/4-wave fused silica substrate before coating
  • 30 arcsec parallelism
  •  ~1:1:1 color combine weights for G2V white-point for Full-Frame (E) detectors
  • Best choice for back-thinned and Sony detectors
  • Equal RGB exposures and one dark time
  • Better color separation (see spectra)
  • Better color rendition for galaxies based upon color theory
  • Significant reflection and star halo reduction
  • Enhanced contrast for HII regions in galaxies due to narrower red (not orange) filter
  • Spectral “gap” between green and red filters to minimize effect of light pollution, especially from high pressure sodium street lamps (see spectra)
  • Highest efficiency blue filter with less UV
  • Correct “teal” OIII color for planetary nebula (OIII signal >97% in blue and green)
  • Parfocal with Astrodon‘s high-performance narrowband, Clear and Near-IR Luminance filters
  • Ultra-hard and durable sputtered coatings coated to the edge of each filter
  • Proudly made in the U.S.A.

The E-Series filters were designed for cameras containing the full-frame KAF8300, KAF3200, KAF6303, KAF16803 sensors. They are also a good choice for the latest Sony and back-thinned sensor or any Progressive Scan Sensor, Front Illuminated or Back Illuminated. The E-Series red filter is a deep red filter about 60 nm wide, which excludes much of the light pollution from high pressure sodium street lamps. Other filter suppliers try to “force fit” their orange filter (designed for the interline KAI11000, KAI2000 sensors) for use with these full-frame sensors. Their orange filter (see below)  is about twice as wide spectrally as our deep red filter.  As a result, their orange filter tends to “wash out” HII regions in galaxies and detail in nebula. Their blue and green color weights are no longer balanced and as a result, the OIII color in planetary nebula is skewed strongly toward blue, rather than the correct teal color. These are the reasons why Astrodon designed E- and I-Series filters for these different classes of cameras for optimum results.

Notice that Astrodon filters are coated to the edge. Other filters leave an uncoated “rim” near the edge that must be blocked by a mask or the design of the filter wheel.  Our approach minimizes stray light from polluting your image.

Please note, filters usually ship within 3 weeks.

Specs

For the complete technical specifications, click here

Shipping

We know that once you've placed your order, you are anxious to receive it! We make every effort to get your order shipped out to you as quickly as possible.

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. We will process the charges to your credit card and your order will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at info@telescopetek.com.

Standard shipping time in the US is between 3-5 business days, though it can vary slightly depending on the destination. We typically For updates on your shipment you can enter your tracking number here.

We distribute nationwide via UPS and Fedex. Unfortunately, at this time we are not able to provide expedited or international shipping.