M16 in near infrared

Stevec35 (Steve) · #1 22-07-2018, 03:42 PM

This a near infrared image of M16 using Astrodon infrared filters which utilize the fact that the STXL6303 sensor has response out past 1100 nm.

Many more normally obscured stars are visible in the infrared image. and the "pillars" are less prominent. Anyway it's something different.

Cheers

Steve

http://members.pcug.org.au/~stevec/M...L6303_RC14.htm

Atmos (Colin) · #2 22-07-2018, 03:57 PM

There is quite a few more smaller stars within the field. Interesting field

Stevec35 (Steve) · #3 22-07-2018, 04:25 PM

Quote:

Originally Posted by Atmos

There is quite a few more smaller stars within the field. Interesting field

Thanks Colin. You always get interesting results with infrared where there's lots of dust.

Andy01 (Andy) · #4 22-07-2018, 05:10 PM

As Spock would say - Fascinating!

Pretty cool new rendition of a well seen target

Ryderscope (Rodney) · #5 22-07-2018, 06:09 PM

Certainly is a fascinating rendition and brings out the ‘pillars’ nicely.

Stevec35 (Steve) · #6 22-07-2018, 07:19 PM

Quote:

Originally Posted by Ryderscope

Certainly is a fascinating rendition and brings out the ‘pillars’ nicely.

Thanks Rodney. Actually I think the pillars are less prominent in IR

Quote:

Originally Posted by Andy01

As Spock would say - Fascinating!

Pretty cool new rendition of a well seen target

Thanks Andy. It certainly is a different look.

JA · #7 22-07-2018, 07:39 PM

Very nicely done Steve

Best
JA

Stevec35 (Steve) · #8 22-07-2018, 07:41 PM

Quote:

Originally Posted by JA

Very nicely done Steve

Best
JA

Thanks very much

gregbradley · #9 22-07-2018, 08:01 PM

A very interesting and fresh take on a familiar target.

Greg.

cometcatcher (Kevin) · #10 22-07-2018, 08:24 PM

That's very cool. You will have to re-shoot everything in IR now.

Merlin66 (Ken) · #11 22-07-2018, 08:35 PM

Interesting result....
Looking at the QE curve it doesn't seem to go beyond 1100nm....

Stevec35 (Steve) · #12 22-07-2018, 09:31 PM

Quote:

Originally Posted by Merlin66

Interesting result....
Looking at the QE curve it doesn't seem to go beyond 1100nm....

Correct. I guess most of the action is probably happening in the 700 - 900 nm range.

Quote:

Originally Posted by cometcatcher

That's very cool. You will have to re-shoot everything in IR now.

I doubt it. It's only worth doing for some targets. Mainly where there is dust in the way.

Quote:

Originally Posted by gregbradley

A very interesting and fresh take on a familiar target.

Greg.

Thanks Greg. It's a new look.

LewisM · #13 22-07-2018, 09:32 PM

Faskinating. VERY faskinating.

Wonder how it'd go combined with H-a and LRGB...

Stevec35 (Steve) · #14 22-07-2018, 09:43 PM

Quote:

Originally Posted by LewisM

Faskinating. VERY faskinating.

Wonder how it'd go combined with H-a and LRGB...

Yes, it works well for some objects. I'l probably get round to merging it with other colours at some stage.

atalas · #15 23-07-2018, 04:39 AM

Yeah more stars Steve but not very pretty is It.

Stevec35 (Steve) · #16 23-07-2018, 08:58 AM

Quote:

Originally Posted by atalas

Yeah more stars Steve but not very pretty is It.

Sorry you don't like it Louie. I almost always go for the unusual stuff and this is my latest attempt to do just that.

multiweb (Marc) · #17 23-07-2018, 02:53 PM

Looks great Steve.

Have you tried to blend it with Ha and a Lum? Looks pretty cool mapped to RGB. See the stepped reflection you get on your bright stars? I've got the same on a refractor. I reckon the IR bounces internally in telescopes where visible light and other bandpass don't.

Merlin66 (Ken) · #18 23-07-2018, 03:10 PM

Based on our work with spectroscopes.... we find that black anodised parts are very (I mean VERY) good reflectors in NIR and above. Velvet flocking recommended.

Stevec35 (Steve) · #19 23-07-2018, 03:29 PM

Quote:

Originally Posted by Merlin66

Based on our work with spectroscopes.... we find that black anodised parts are very (I mean VERY) good reflectors in NIR and above. Velvet flocking recommended.

Noted. Of course this is not intended to be very scientifically accurate. Just to demonstrate in general terms what objects look like in NIR as opposed to visual.

Quote:

Originally Posted by multiweb

Looks great Steve.

Have you tried to blend it with Ha and a Lum? Looks pretty cool mapped to RGB. See the stepped reflection you get on your bright stars? I've got the same on a refractor. I reckon the IR bounces internally in telescopes where visible light and other bandpass don't.

Thanks Marc. Don Goldman says that the stepped reflection is due to the CCD cover slip not being optimized for canceling out IR reflections so I think your explanation is pretty close to the truth.

multiweb (Marc) · #20 23-07-2018, 03:59 PM

Quote:

Originally Posted by Stevec35

Don Goldman says that the stepped reflection is due to the CCD cover slip not being optimized for canceling out IR reflections so I think your explanation is pretty close to the truth.

Right, didn't think about the CCD reflections. Makes sense given their size. Have you ever done the HH in IR? I reckon that'd be pretty cool. Like M16 you've got only the pilars and central region with a black starry background, the HH should almost be like a negative pricture, bright silhouette without the red curtains in the back. I wanted to try last summer but it got stinking hot. Might try at astofest it it gets high enough.