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Sold by: EXPLORE SCIENTIFIC
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(237 ratings)
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Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (2")

4.7 4.7 out of 5 stars 48 ratings

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2"

Purchase options and add-ons

Brand Optolong
Photo Filter Thread Size 48.04 Millimeters
Coating Description Multi Coating
Photo Filter Effect Type Enhancing
Water Resistance Level Not Water Resistant
Product Dimensions 2"L x 2"W

About this item

  • Dual H-Alpha/O-III 7nm narrowband filter
  • Allows for imaging in bright man-made light pollution and moonlit conditions
  • Most useful for One-Shot Color cameras
  • Take color images without needing to combine images with multiple filters
  • Use for taking images of emission nebulae
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Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (2")
Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (2")
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Price$306.00$217.60$249.00$171.16$159.99$198.00
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Sold By
StarPal
StarPal
StarPal
StarPal
SVBONY Direct
StarPal
thread size
48.04 millimeters
48 millimeters
0 millimeters
1.25 inches
2 inches
48 millimeters
photo filter effect
Enhancing
Enhancing
Enhancing
Enhancing
Nebula, Polarizer
Enhancing
water resistance
not water resistant
not water resistant
not water resistant
not water resistant
not water resistant
not water resistant

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Product Description

The Optolong L-eXtreme is a 7nm dual-bandpass filter which can be used with one-shot color cameras like DSLRs and CCD/CMOS astrophotography cameras. It is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image emission nebulae even in bright, light-polluted or moonlit skies. The L-eXtreme isolates the H-Alpha and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio of the nebulae are maximized. For people who are imaging in very light polluted areas or when the moon is out, the L-eXtreme is an excellent choice. The advantage of the L-eXtreme filter is that there is no light transmission between the H-beta and OIII lines (as there are no nebula emission lines there). This reduction in light pollution maximizes the nebula's signal and makes the sky background darker while imaging. Unlike the L-eNhance filter, which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual-band, passing just the Ha and OIII emission lines in order to deliver improved light pollution rejection. Note: For imaging galaxies and reflection nebulae, the Optolong L-Pro filter is more appropriate as this filter will reject much of the light from those objects.

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Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (2")


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Customer reviews

4.7 out of 5 stars
4.7 out of 5
48 global ratings
LOVE it for deep sky
5 Stars
LOVE it for deep sky
I have a red cat 51 and this filter is a game changer for deep sky objects. I have tried it on my svbony f/7 120ed and so far not much luck. I think the reviews are correct that if you are going to use this, you need a faster scope. I won't take nebula photos without it anymore.
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Top reviews from the United States

Reviewed in the United States on May 28, 2023
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5.0 out of 5 stars LOVE it for deep sky
Reviewed in the United States on May 28, 2023
I have a red cat 51 and this filter is a game changer for deep sky objects. I have tried it on my svbony f/7 120ed and so far not much luck. I think the reviews are correct that if you are going to use this, you need a faster scope. I won't take nebula photos without it anymore.
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Reviewed in the United States on July 20, 2023
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5.0 out of 5 stars Works great with an OSC camera to image Ha and OIII
Reviewed in the United States on July 20, 2023
Highly recommend for astrophotography. See my image for results with a Redcat 51 and ASI294MC Pro camera
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Reviewed in the United States on August 1, 2022
One person found this helpful
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Reviewed in the United States on June 21, 2022
Reviewed in the United States on December 22, 2021
One person found this helpful
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Reviewed in the United States on February 15, 2022
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5.0 out of 5 stars No good for galaxies or planetary nebulae.
Reviewed in the United States on February 15, 2022
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2 people found this helpful
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Reviewed in the United States on July 11, 2022
2 people found this helpful
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Reviewed in the United States on February 9, 2022
One person found this helpful
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