Ok so now that I understand filters a little more
I am shooting to create the following images that James created using a some filters.
James used the following filters, I choose the 1.25mm versions as I am going to add a manual filter wheel for now with my ASI533 to keep price down
L-eXtreme Dual Band 7nm HA/OIII Filter $239.99
Astronomik SII 6 nm CCD Filter $199.95
However thinking about it I thought why not just go with an HA and OIII filter so I can capture just HA, or just OIII from objects. Then I started going down the wormhole of filters and found the following
Optolong 1.25" Filter Set with H-Alpha, SII, and OIII Filters
Optolong 7nm H-Alpha Filter - The Optolong H-Alpha 7nm is an extremely narrow emission-line filter that works by allowing a 7nm bandwidth of light, centered on the 656nm wavelength
Optolong 6.5nm SII Filter - The Optolong Sulfur-II 6.5nm Extra-Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 672nm
Optolong 6.5nm OIII Filter - The Optolong Oxygen III 6.5nm Extra-Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 500nm
ZWO 1.25-inch H-alpha SII OIII 7nm Filter Set
* About 90% transmission at H-alpha line 656nm (H-Alpha filter).
* About 90% transmission at Sii line 672nm (Sii filter).
* About 90% transmission at major Oiii line 500 nm (Oiii filter).
Orion Extra Narrowband OIII, SII & H-Alpha CCD Filter Set - 1.25"
The H-alpha filter has a transmission of 90% at the hydrogen-alpha line of 656.3nm and a full width at half-maximum (FWHM) bandpass of 7nm.
And the S-II filter passes light at the 672.4nm wavelength (the Sulfur-II line in the deep red end of the visual spectrum) with 90% transmission and a bandpass also of 7nm.
The O-III filter passes light at the 500.7nm wavelength (the Oxygen-III line) with very high 90% transmission and a bandpass of 7nm.
Based on what I am reading the are all with in the same wavelength, and all allowing 90% transmission. So does price really matter, or am I just paying for the name?
My setup is in my signature and based on multiple websites my Bortles class is 2-4 so maybe call it 3.