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Ptolemaeus Alphonsus Arzachel (HQ) by GraY25

Imaging doubly ionized oxygen emission at 496/501nm.

Showing 1-50 of 57

	Replies	Views	Created
Is it a mistake to combine Ha-oiii 12nm with oiii-Sii 6nm filters? Acquisition Duo-Narrowband H-alpha +5 Gabriel Last post: Gabriel	6	153	Oct 18, 2025
Request for Data Collaboration of Sh2-174 Acquisition H-alpha Narrowband +4 Rodd Dryfoos Last post: Gamaholjad	18	432	Oct 14, 2025
Astro pixel Processor - How to combine a OSC broadband image and Extracted Ha and OIII from a dualband filter? Aries Productions Astro Pixel Processor (APP)ZWO ASI2600MC Pro Broadband +4 Itto Ogami Last post: andrea tasselli	10	213	Sep 5, 2025
Advice on duo-band filter selection for astrophotography setup Filters Acquisition Duo-Narrowband +4 cafuego Last post: cafuego	13	215	Aug 31, 2025
Focus Issue with OIII filter on edgeHD 8 Celestron EdgeHD 8"Auto-Focusing OIII Ancient.Photon Last post: bigCatAstro	5	142	Aug 12, 2025
Where to find the best professional O3 images? OIII Help Needed Bill McLaughlin Last post: Habib Sekha	1	135	Jul 21, 2025
PI crash trying to local normalize ZWO ASI1600MM Pro Processing OIII +2 Taras_M Last post: Taras_M	3	127	Feb 21, 2025
Chroma 3nm for Fast Systems - Anyone using them? Equipment Filters OIII Bill McLaughlin Last post: Dunk	2	156	Jan 8, 2025
How to separate channels from the Antlia Quad Band in PI Antlia Quad Band Anti-Light Pollution Filter 2" Mounted Narrowband OIII +2 Keith Geissler Last post: Franklin Marek	8	410	Dec 31, 2024
What is the colour of OIII? Processing OIII Narrowband +1 Willem Jan Drijfhout Last post: Adam Drake	28	1.6k	Dec 28, 2024
Blending in Pixelmath Processing H-alpha OIII +1 Bill bill.beauchemin@gmail.com Last post: akshay87kumar	5	266	Nov 1, 2024
Strange noise on images... Could this be dew? Acquisition SII OIII +1 Harry Karamitsos Last post: Jared Willson	25	646	Oct 12, 2024
L-Ultimate Under Full Moon Optolong L-Ultimate Duo-Narrowband H-alpha +1 James Last post: James	8	489	Sep 15, 2024
Effects of smoke - not surprising but interesting Acquisition Narrowband H-alpha +2 Bill McLaughlin	0	170	Jul 26, 2024
Silk Nebula Discovered by Enthusiast Astronomers with QHY600M and QHY1920M Cameras OIII Narrowband H-alpha +1 Yilia Yu Last post: Yilia Yu	5	854	Jul 12, 2024
What are these strange reflections? Acquisition OIII Deep Sky +1 Willem Jan Drijfhout Last post: Willem Jan Drijfhout	2	158	May 13, 2024
Antlia 2.5nm OIII Ultra Filter - NIR Transmission Filters Acquisition OIII +2 Jacob Heppell Last post: Jake Slater	86	3.7k	Apr 30, 2024
Help Me Understand Why So Many Rejected Frames Pleiades Astrophoto PixInsight Processing OIII +2 Robert Khoury Last post: Robert Khoury	16	777	Jan 8, 2024
Filter burst, peeled off ZWO O-III 7nm Filters OIII +1 Skender Kajoshaj Last post: Skender Kajoshaj	14	253	Dec 29, 2023
O3 Flattening Issues QHYCCD QHY268 M Acquisition Gradient Removal +2 Andre Vilhena Last post: Peter Maasewerd (pete_xl)	9	247	Nov 8, 2023
OIII Improvment - NGC7635 Bubble Nebula Processing OIII Deep Sky +2 Dominik Last post: Marcelo Muñoz	14	858	Nov 6, 2023
Adding low to preexisting high signal to noise ratio imaging data Acquisition OIII Narrowband +1 Marc Monarcha Last post: Dionysus	11	655	Sep 18, 2023
Strange vertical lines Pleiades Astrophoto PixInsight OIII Artifacts AstroRBA Last post: AstroRBA	9	1.1k	Aug 30, 2023
Anyone ever heard of the HaGO palette? Processing Narrowband H-alpha +2 Oscar Last post: Pistachio_Enjoyer	6	761	Aug 15, 2023
How do you manage to make the O3 pop up in your images? Siril Team Siril Adobe Photoshop Processing +2 Cristian Arhip Last post: Marcelo Muñoz	10	1k	Aug 6, 2023
Antlia 3nM compared with Baader 4nM narrowband filters. Comments on either. Equipment Filters Narrowband +2 David Moore Last post: Robert Khoury	17	793	Jul 28, 2023
Optolong L-Ultimate filter imagers, share and discuss Optolong L-Ultimate filter Narrowband H-alpha OIII Tareq Abdulla Last post: Carlos Rincón	5	110	Jul 17, 2023
Looking for advice with selection of dual narrowband Ha/OIII filters for fast (F2) systems Equipment Duo-Narrowband H-alpha +1 Peter Goodhew Last post: Jeff Reitzel	4	341	Jul 10, 2023
OIII Aberration Question Askar FRA500 Acquisition OIII +2 Ollie Aplin Last post: andrea tasselli	2	160	Jun 20, 2023
Dual NB Imagery - Combining Blue and Green channel? Processing OIII One-Shot Color +1 Andre Vilhena Last post: John Stone	17	887	Jun 13, 2023
Review of Antlia 2.8nm Ha/Oiii/Sii Ultra Series and the LRGB R+ Pro Dark Series Antlia H-Alpha Pro Ultra Filter - 2.8 nm Ultra Narrowband - 36 mm Filters Narrowband +2 Sascha Wyss	0	327	May 22, 2023
Strange light at all OIII antlia 3nm filter Acquisition OIII Deep Sky +1 Taras_M Last post: Michael Hornfeck	9	556	Apr 23, 2023
What is the maximum viable F-Ratio for a Telescope used to find planetary nebula? Equipment OIII Planetary Nebula Anderl Last post: Björn Arnold	7	656	Feb 18, 2023
New antlia sii and h beta 5nm filter. Useful? Equipment SII OIII +1 Anderl Last post: Tim Hawkes	10	730	Feb 2, 2023
Issues with Flats DSS and APP Aries Productions Astro Pixel Processor (APP)Luc Coiffier DeepSkyStacker (DSS)Processing +2 Ian Last post: Andreas Zeinert	3	198	Jan 15, 2023
New Processing Method to Boost a Weaker O3 Signal- Explained Processing OIII Narrowband +1 Chris White- Overcast Observatory Last post: Chris White- Overcast Observatory	9	1.1k	Dec 25, 2022
OIII/ SII stretching versus HA in nebulae. Art or science? Processing Narrowband SHO +1 Tim Hawkes Last post: Tim Hawkes	4	459	Nov 3, 2022
Can anyone help with this question about stars ionizing the Lion nebulae SH2-132? SOLVED OIII Off-topic Emission Nebula Tim Hawkes Last post: Tim Hawkes	2	411	Oct 22, 2022
How much improvement does a 3 nm OIII filter provide over 6 nm? Filters Acquisition OIII +2 Tim Hawkes Last post: Simon Pepper	41	3k	Sep 15, 2022
How/where can you find the gas composition of nebulae before shooting? OIII Narrowband dreamsandmonsters Last post: Joe Alexander	4	308	Jun 5, 2022
Gardient on OIII flat frames QHYCCD QHY268 M Equipment Gradient Removal +2 Marc Last post: Marc	4	350	Feb 23, 2022
Getting Dual Band Data with a OSC Aries Productions Astro Pixel Processor (APP)ZWO ASI294MC Pro Processing +2 Mike Butorac Last post: Clint Lemasters	10	725	Feb 16, 2022
O3 filter calibration issue QSI 683wsg-8 Processing OIII +2 Abduallah Asiri Last post: Pablo Gazmuri	9	467	Jan 16, 2022
Issues with Star Alignment using Chroma Filters Equipment Narrowband SII +2 William Gottemoller Last post: Brian Puhl	13	666	Dec 20, 2021
Flaming Star Nebula and Spider Nebula share the same path? OIII Off-topic Nebula Gregg Williams Last post: Gregg Williams	3	134	Dec 10, 2021
Baader O3 Problems Celestron RASA 11"Filters Acquisition +2 Adrian Criss Last post: Adrian Criss	7	158	Nov 5, 2021
What's this OIII signal in Sh2-86? (If it's in Sh2-86) OIII SHO NGC6823 +2 Björn Arnold Last post: andrea tasselli	11	320	Aug 17, 2021
RCC More OIII The Crescent Nebula Aries Productions Astro Pixel Processor (APP)Filters OIII +2 Dale Penkala Last post: Dale Penkala	11	182	Jul 8, 2021
Baader CMOS optimized filter for TV-NP127is and QHY600 Equipment Filters Narrowband +2 Jan Bielański	0	48	Jul 7, 2021
Cep OB2 Association Stars Crowd imaging projects OIII Collaboration Daniel Erickson Last post: Björn Arnold	5	54	Jun 25, 2021

Showing 1-50 of 57