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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.
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
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.
Not used it yet but have read great reviews on it,Great service from FLO as usual
A fantastic filter. I had to wait a while to use it as the weather has been hindering progress. First light was on the Veil Nebula complex with a modified DSLR and Redcat 51. The first 5 minute exposure blew me away. The amount of Ha and OIII detail visible in a single image is astonishing. I had read that the filter was prone to creating haloís around brighter stars but Iíve yet to see any haloís in my images. I look forward to using this filter more and more as the quality it delivers speaks for itself.
Unlike most astro purchases this one arrived without clouds, 3 consecutive clear nights and a big bright moon. I inserted it between my astromodded DSLR and scope, I managed to get 5 hours of data over the first two nights of the Rosette Nebula and the quality of the subs was superb, processing the data was so easy, the result was probably the best astro picture I've ever produced. The 3rd night I tried to capture some data on IC 443 the Jellyfish Nebula, 3 hours just isn't enough on this target but what I have got looks very good, I shall be getting more data the next clear night, hopefully with less moon about.
Thanks to FLO for a very fast delivery. I tried out the filter with a ZS61 at F4.8 on the February 26th full moon night on several emission nebulae and obtained good results using exposures of 4 to 8 minutes, depending upon altitude, at ISO 800. The filter worked really well.
Amazing product. Really works in heavily light polluted skies. Highly recommended and lightning quick service as ever from FLO.
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