UHC & OMB Filter Test With M17 (Kurt Zeppetello)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: M 17 · NGC 6618 · Omega nebula · Sh2-45

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UHC & OMB Filter Test With M17

Link: http://kurt-zeppetello.blogspot.com/

Powered byPixInsight

UHC & OMB Filter Test With M17

Link: http://kurt-zeppetello.blogspot.com/

I did not plan on doing this test it happened because I wanted to image M18 and thought I would redo M17 while I was at it since I never imaged it with the Astronomik UHC (Ultra High Contrast). Previously I did it with the Astronomik CLS. Unfortunately I put the Astronomik OWB (Original White Balance) filter in my camera (modified Canon T3i/600D). So I had to go back on another night to do what I wanted to do in the first place. So here are the results (of my mistake of not paying attention)...

Version A shows the the enter image using the OWB filter used for turning a modified camera back factory white balance.

I should also mention that the images using the UHC were from 7/26/2017. The acquisition was identical except I collected 21 sub frames rather than 18 (six more minutes).

Version B is the same image using the UHC filter. The UHC allows for more Ha light to pass with less light pollution, thus more contrast and more of the nebula. The UHC filter allows the transmission of nearly 100% of the radiation from both O-III and the H beta lines. UHC filters are mainly used for emission nebula and not recommended for star clusters and such as it blocks some of their light. Notice the smaller size of the stars. I like how the OWB has a better star field.

Version C and D are a combined image of both the UHC and OWB images. I wanted increase the star field but keep the increased nebulosity. I used different blending methods to achieve this.

Original
C
Final
D

C

Description: Figure 3 - Combined 55% UHC - 45% OWB Normal Blend

Uploaded: ...

D

Description: Figure 4 - Combined 55% UHC - 45% OWB Luminosity Blend

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	1674289
PixInsight job	UA10GL9FJ2E5A7HIK05DD1THFM0JH8RY
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h21m02s.50
RA (top/left)	18h24m00s.30
RA (top/right)	18h17m49s.74
RA (bottom/right)	18h18m02s.20
RA (bottom/left)	18h24m15s.74

Dec (center)	-16°08′46″.10
Dec (top/left)	-15°34′24″.4
Dec (top/right)	-15°39′03″.3
Dec (bottom/right)	-16°43′01″.2
Dec (bottom/left)	-16°38′19″.3

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UHC & OMB Filter Test With M17

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