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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
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 halo’s around brighter stars but I’ve yet to see any halo’s 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.
Only had a chance to use it once so far but the minute I slotted it in to my scope and looked at my real time image on my PC I could see a huge difference and the couple of objects that I did manage to shoot had far more detail and brightness.I live in an area where there are LED Street lamps and the Optolong L-Extreme seems to just cut straight past them.Highly recommended for anyone wanting to get great images of emission nebula, supernova remnants and the like with a OSC or DSLR.
Only had chance to use once so far due to clouds, but am amazed at the results, looking forward to using again
Due to the disruption caused by Covid, I had to wait a while before this 2" L-eXtreme filter arrived, and I've had it for a short while now but long enough to be impressed. I've reserved it for shooting while the moon is fairly well illuminated, and even shooting fairly close to the moon I get decent results. It really does manage to darken the background and help bring out faint details. Well worth the money and the wait.
Amazing results with an ASI 533MC Pro. Highly recommended, particularly if you are in a Bortle zone 8-9 like me. Getting results that I never thought possible from my site.
I use this attached between a 72mm doublet and 533mc pro OSC. Before this filter, I had to drive an hour from a bortle 9 house location to a bortle 4 wilderness, spend 3 hours there scared at darkness, and drive back home for another hour tired and sleepy. This filter saved me from wasting 2 hours on road, spending on fuel and car running costs and most importantly horror of darkness at wild. I can have 10 minute subs under intense light pollution of Doha city including white LED street lights. So far I had great results on nebulas. I can barely see a max of 10 stars with my eyes and this filter can extract nebulosity in 10 min subs.
Received order after 2 days (int'l) - extremely fast!Will review filter after use!
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