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Hi there, I am considering upgrading my setup with a narrowband filter/wheel but first wanted to know if it works to shoot SHO with a DSLR? If anyone has any experience with such, can they please share? One question I have is would I then need to set my DSLR settings to be shooting monochrome? Thanks! |
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Hi, Yes you can shoot « SHO » with DSLR using narrowband filters using OSC (Colour Single Shots). Actually, you need to know that when you shoot monochrome with your DSLR, the image is captured in colour through the Bayer Matrix (Most often RGGB) and then your DSLR transform the colour image into Monochrome. Therefore, shooting in monochrome with narrowband filters does not help. Here is what you need: * You must have an astro modified DSLR (removing the native IR-cut filter of your sensor) in order to increase the sensitivity to Ha * Use Dual band filter like Optolong L-extreme (or other dual band filters) design to block all wavelength except Ha (656nm) and OIII(ca. 500nm) * Take colour shots * In post you can extract the Ha and OIII signal separately * In post you can create a « synthetic » SII signal by combining Luminance, Ha and OIII signals. The many different way to proceed * You can create an RGB image using the Ha, OIII and SII signals you have previously extracted and place in the right channel. Note: Instead of creating an artificial SII channel you could also take colour shot with an SII filter and extract the Red channel in post. But you need to know that usually SII signal is much weaker than Ha and OIII. Beacuse of the bayer matrix, you will need lot of exposure to have a good SII signal Here is what you can achieve with such a method : https://www.astrobin.com/gicvax/ . In the comment, I share the method I use to extract Ha and OIII channels, create a synthetic SII channel and combine Ha, OIII, SII to create colour RGB image. If you want to do real SHO, you need a monochrome camera (no bayer matrix) and use separated filters for each wavelength (1 for Ha, 1 for OIII, 1 for SII and usually 1 for Luminance). But I don’t think this what you want to do at this stage. I hope it will help you |
