Comparison of 3nm, 7nm and NBZ

[tooth_dr]

I was having an issue with my power supply last night, so I was testing the EFW and the focusers to work out the problem.  The sky wasnt great anyway and there was lots of patchy cloud moving across.  I saw this as an opportunity to compare subs from different filters.  Same skies, same optics, same sensors.  Nothing surprising : the NBZ filter in the colour camera just doesnt cope with the moon and/or effects of being a colour camera, and the 3nm filter is better than the 7nm in a single sub.  You can really compare them if you click on the first image and cycle through the images. The Baader filter done a decent job though to be fair at a fraction of the price of the Chroma.   

 

Scope - APM LZOS 105/650 with 0.75x Riccardi reducer

 

Filter 1 - Chroma Ha 3nm / Mono IMX571

Filter 2 - Baader Ha 7nm / Mono IMX571

Filter 3 - IDAS NBZ Dual Band - Ha extracted / OSC IMX571

 

First set of 3 - each image is a calibrated single 300s sub, with stretch in APP, saved as TIFF, opened in PS, edges cropped and saved as JPEG

Second set of 3 - each image is a calibrated single 300s sub, with stretch in APP, saved as TIFF opened in PS, edges cropped, NoiseXTerminator applied at 50%, black point adjusted, and saved as JPEG

 

 

SET 1:

 

SET 2:

 

 

 

 

Edited November 7, 2022 by tooth_dr

[tooth_dr]

I just realised I used the 3nm flats for the 7nm lights.  I thought the vignetting looked a bit off. I’ll update this later. 

[fireballxl5]

NBZ/OSC doesn't look that bad! I'd use it with the Moon,  and do🙃

[tooth_dr]

1 hour ago, fireballxl5 said:

NBZ/OSC doesn't look that bad! I'd use it with the Moon,  and do🙃

I do the same, use it any time the moon is out, but I suppose now I wonder is it going to add anything to the mono data other than noise.

[Shibby]

Nice comparison. Good to know the filters deliver what they should/claim to!