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Model: opt_l-extreme_1.25Part Number: 13801
For One Shot Colour / DSLR Imaging - Simultaneously Capture H-alpha and Oxygen III
The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximises nebulae signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.
Unlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.
IMPORTANT: Filters manufactured by Optolong are NOT designed for observing or photographing the Sun. DO NOT use Optolong filters to observe or photograph the Sun. If you do it will result in permanent eye damage!
L-eXtreme is a two 7nm bandpass filter which can be used with one-shot colour cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximised. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter.
Hydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the Sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life.
White Line - Represents the transmission curve of the L-eXtreme Filter.
The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)
The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)
O3 7nm+Ha 7nm
Light pollution lines blocked >99.9%
Transmitted Wavefront RMS
For me, in terms of detail captured, this is an absolute game changer. I couldn't work out 'correct' exposure times and gain settings, so my first light with this filter was guess work. Even so, with just a few subs I could see more detail in the Elephant's Trunk Nebula than I had ever managed to capture before, even with hours of data. I have a lot to learn in regard to processing the data produced by this filter but already this feels like a massive leap forward on my AP journey.
This is just an amazing piece of filter. We are using it bortle 9 sky.
Finally got the chance to try this filter on a DSO. I had previously imaged the Eastern Veil Nebula with Skywatcher 200P and Canon 1000D (modded), proding a reasonable image with 1.5 hrs of data. However, the image was dominated by the star field and there wasn't very much blue nebulosity (OIII emission). The Optolong L-Extreme improved this enormously, isolating the HA and OIII nebulosity beautifully and enhancing the nebula above the background star field. All on 1.5 hours (5 minute subs) exposure, with a full moon nearby! Very pleased with this filter.
I already had the ZWO duo-band filter, but seeing other images taken with this filter, I took a punt on it to see how much of a difference this filter makes. I was absolutely blown away by the immense richness of the colours, with limited clear skies of late, I only had one night but imaged both the east veil nebula (C33 - NGC 6992) and the bubble nebula (C11 NGC7635) and the results were stunning, so looking forward to the coming dark skies season and have a list of objects to capture.I am using this with the ZWO filter wheel and the ASI 533MC Pro, with William Optics Z73 APO
I could not be more impressed! Revealed otherwise hidden details that my Astronomik pollution filter excluded. There were perhaps issues with focusing and platesolving but perhaps I need to up the exposure times a bit
Haven't used the filter yet due to cloud cover, but fitted on my RedCat scope nicely. Usual great service from FLO, thanks!
I only received this lens a few days ago & was lucky to have a whole night clear last night. I Took 50x180 sec on IC1396. Test shot at same exp length showed good Ha signal straight out of my asi 533. I'll be processing these later today but I expect good things. The lens acted faultlessly under a 97% Moon, VERY impressed. Came well packaged & arrived very quickly from FLO as usual.
I live in a Bortle 4/5 zone, with more light pollution towards the North, so wasnít sure how much of a difference this would make for the summer nebulae (was primarily bought for the northern DSOs such as heart / soul menís etc). However it is a game changer for everything. The signal and contrast from veil, butterfly, pelican nebulae were a step change improvement to equivalent images taken without it. Thoroughly recommend the L-extreme if you are after imaging the Ha O3 nebulae. Canít wait to have a look at Orion Ö.. Service from FLO was as excellent as ever.
Only managed to use the filter for one short session (2hours) and was blown away with Subs and final image. I live in Bortle class 5 and the moon was at approx 50%, all subs came out clear with lost of nebula details. Final image show no star bloating and lots of detail for so little data. Highly recommend the filter and FLO as they have been great with every purchase I have made.
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