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As new condition ultra narrowband 1.25" Baader filter. 3.5nm bandpass for nice small stars.
Bought and loved it, but using a DSLR again and have no use for this filter.
£140, can post.
This has been a bit of a project. Last year I worked out that my 200mm Canon F2.8 lens and ASI1600 would frame the whole of the Veil complex quite nicely. I captured Ha and OIII data for the east and west nebulae with a Tak FSQ 106 and added this into the widefield image. Although the Tak data had to be shrunk down it did add a bit of extra resolution where it was needed.
The difficulty for me has been the processing. I have found it really difficult to tease out the faint wisps of detail and have tried the usual routines of micro contrast adjustments using curves along with Scott Rosen's Screen blend/mask inversion method but the results weren't great owing to the close proximity of faint and bright nebulosity. I'd heard about the PI process tool for removing stars, Starnet, so loaded this and had a rare foray into PI. This proved very helpful. It was a luminence created from Ha and OIII using the 200mm lens with the Tak data mixed in. Then the starless layer was added in PS with the screen blend mode at 50% opacity. The nebulosity detail was so well preserved I didn't need a mask. After blending I reduced the stars a bit more using the starless layer again and darken as the blend at 50%. I should really unleash some of the stars to add a bit of "punch" but I've wrestled with this data enough for now! I plan to use it further as I look deeper into the Gorgon that is PixInsight!
Telescope: Tak 106 for E and W veils. Canon 200mmL lens
Camera: ZWO ASI 1600 pro mono cmos, Gain 150, offset 50
Filters: Baader 7nm OIII and Ha
E+W Veil 10x30 mins each channel for each nebula. Whole complex 50x5mins for each channel
Captured with SGP, calibrated, aligned and combined with PI, processed mainly with PS but PI for Starnet. Ha mapped to red and OIII to both blue and green
Selling my full narrowband set up for multiple reasons: I could do with the money and mono just isn't really doing it for me.
Altair Astro 183m Tec
Baader Narrowband filters (Ha, OIII, SII and Clear)
ZWO Electronic Mini Filter Wheel
All associated cables/plugs
T2 extensions to reach 55mm back focus for use with reducers
Boxes and cases
There is a scratch on the T2-T2 adaptor for the filter wheel and a couple of the labels on the filter boxes have been torn. But otherwise the important parts work perfectly well.
Collection or postage via DPD.
Buyer to pay postage and PayPal fees.
No offers currently accepted, and I would rather not split
THIS ITEM HAS NOW BEEN SOLD.
This listing is for my personal narrowband filters (Kayron from Light Vortex Astronomy). They are the Astrodon Hydrogen-Alpha (HA), Oxygen-III (OIII) and Sulphur-II (SII) 3nm 1.25" narrowband set. These are considered the highest-end narrowband filters money can buy, able to produce images of exceptional quality and incredible sharpness, cutting through a vast amount of light pollution. The 3nm variants featured here are fantastic for pulling out fine nebulous structures clearly above background. For more information, please see Astrodon's website:
Please note that these three filters together currently retail at just over £1,710 from UK suppliers, €2,180 from European suppliers or $1,690 from US suppliers. Payment is preferred via bank transfer but PayPal is OK with an extra 2.9% to cover PayPal fees. I'll cover postage to you via tracked Courier.
I welcome any questions you may have regarding this listing. Thank you for looking.