Nudge ?

Hi Steve,
this is my version of the M31 test data. I only used the RGB data because all the Lum-Ha data was out of focus. I noticed a lot of light pollution in the RGB data after stacking. But I could remove this with a DBE. Otherwise I am satisfied with the RGB filter.

What exactly was the difference between OSC and RGB? When should I use what?

CS
Darius

Looks good Darius.

I am also puzzled by exactly what the different filters are supposed to do. If we have bandpass spectra it would be useful to publish them in the Equipment tab on in this thread.

Guys, it tells you on the equipment page for pier!

men are blind at times, so my wife keeps telling me :)

OSC is just standard with NO filters
RGB  is the IDAS D3 as is cuts out skyglow etc whilst keeping a near standard colour balance, it also helps whilst the moon is in its smaller phases

This was just a quick test job and I have since added moon avoidance to the filters

Colour Cameras
Moon avoidance by filter:


• 120/10 = OSC & Enhanced HA/Lum

• 110/7  = RGB

• 10/5  =  Duoband Filters

I got the text description, I was looking for the bandpass spectrum.

In case anyone else is interested, these are what is on the web.

Hi all, I did put a quick test shot in, I am just looking for some feedback if anyone has actually had a play with the data from these new filters yet?

To clarify, I mean the - HEUBII & IDAS D3 filters not the Askar duoband

Cheers

Steve

I am crunching a lot of data right now to make a comparison between filters ... will post when ready.

Cheers

Manuel

Hi everyone,

I have tested and compared the different filter options on Pier 5.  The dataset I used for this purpose is 2276 p5 wr134 1169. 

Clearly the HaOiii and SiOiii filters give a nice enhancement of the narrowband signal. There is some increase in Ha in the IDAS - HEUB2 Filter Lum + Enhanced HA filter,. 

The image included in this post shows the different results for 60x60s (1hr) integration. The subs were calibrated and integrated in APP. I then did a very coarse background extraction.

I also compared the 30s and 60s subexposures in OSC integrating an increasing number of subsexposures to see how the SNR and Noise curves behave. The graphs included in this post show that at the 30s and 60s subsexposures have a similar SNR at the same total integration time, enable the identification of a similar number of stars, even if the 60s subexposures show a slightly higher Noise than the 30s ones. 

Any questions? Feel free to ask

CS
Manuel

Hi everyone,

I have tested and compared the different filter options on Pier 5.  The dataset I used for this purpose is 2276 p5 wr134 1169. 

Clearly the HaOiii and SiOiii filters give a nice enhancement of the narrowband signal. There is some increase in Ha in the IDAS - HEUB2 Filter Lum + Enhanced HA filter,. 

The image included in this post shows the different results for 60x60s (1hr) integration. The subs were calibrated and integrated in APP. I then did a very coarse background extraction.

I also compared the 30s and 60s subexposures in OSC integrating an increasing number of subsexposures to see how the SNR and Noise curves behave. The graphs included in this post show that at the 30s and 60s subsexposures have a similar SNR at the same total integration time, enable the identification of a similar number of stars, even if the 60s subexposures show a slightly higher Noise than the 30s ones. 

Any questions? Feel free to ask

CS
Manuel

Thats very useful Manuel...it really demonstrates the differences very well...

Hi everyone,

I have tested and compared the different filter options on Pier 5.  The dataset I used for this purpose is 2276 p5 wr134 1169. 

Clearly the HaOiii and SiOiii filters give a nice enhancement of the narrowband signal. There is some increase in Ha in the IDAS - HEUB2 Filter Lum + Enhanced HA filter,. 

The image included in this post shows the different results for 60x60s (1hr) integration. The subs were calibrated and integrated in APP. I then did a very coarse background extraction.

I also compared the 30s and 60s subexposures in OSC integrating an increasing number of subsexposures to see how the SNR and Noise curves behave. The graphs included in this post show that at the 30s and 60s subsexposures have a similar SNR at the same total integration time, enable the identification of a similar number of stars, even if the 60s subexposures show a slightly higher Noise than the 30s ones. 

Any questions? Feel free to ask

CS
Manuel

I very much look forward to your final analysis on this Manuel, it highlights a few things to me and this is my personal take on the data

1. The RGB filter is a great all-round filter that will allow a certain amount of moon influence whilst still maintaining a good colour balance, it will complement the Askars very well
2. The HEUB2 filter was a waste of money and is a poorer version of the RGB filter
3. The Askar Colour magic were an excellent investment and I am very happy we purchased them
4. Shorter subs suit this pier better than longer ones, we gain nothing from longer subs due to the fast optical speed of the system and in some respects they are detrimental to the noise

Thank you so much for all your hard work behind the scenes BTW, its paying off in spades and I think we will all benefit from it :)

Steve

I will be continuing this analysis with the HaOiii filter, testing the influence on subexposure durations on image quality.

CS
Manuel

On my personal rig at under the glorious Bortle 7/8 skies around Seattle I use the IDAS LDS-D3, Antlia Triband RGB, and Antilia Ha/Oiii dual band with my QHY 268c. The IDAS LDS-D3 sucks some of the color out of the images. I still use it but now mostly in my guide scope. The filter I use the most now is the Antlia Triband RGB. This is a combination of the triband and dual narrow band. https://www.astrobin.com/vysnpw/?nc=collection&nce=22709  LDN 1266 will turn into a blob of Ha but using the triband I could get more Sii and orange into the image. This is literally imaged out my front window with LED lights everywhere.

I think the correct high speed version of the Antlia Triband RGB would be really good on a targets like Orion.

Daniel

This one was imaged with the Antlia Triband RGB from my house. 

On my personal rig at under the glorious Bortle 7/8 skies around Seattle I use the IDAS LDS-D3, Antlia Triband RGB, and Antilia Ha/Oiii dual band with my QHY 268c. The IDAS LDS-D3 sucks some of the color out of the images. I still use it but now mostly in my guide scope. The filter I use the most now is the Antlia Triband RGB. This is a combination of the triband and dual narrow band. https://www.astrobin.com/vysnpw/?nc=collection&nce=22709  LDN 1266 will turn into a blob of Ha but using the triband I could get more Sii and orange into the image. This is literally imaged out my front window with LED lights everywhere.

I think the correct high speed version of the Antlia Triband RGB would be really good on a targets like Orion.

Daniel

 

Hi Daniel, the D3 I mainly purchased as an extension to normal OSC imaging from a dark site, an aggressive LPR filter it 100% is not.

We are dark so natural sky glow and the moon are our main components, so for me this filter I hoped would allow uses to image brighter objects in standard colour when the Moon was around, thereby extending the imaging time each month of the system as a whole

The Antilia is a great filter, we have one on P11 but its more aggressive that the IDAS in its cutoff's and how it handles the narrowband signal in relation to RGB

I was hoping some members may try it for Galaxies plus any standard reflection or emission nebula where they wanted o maintain better colour correction at the same time :)

Steve

This one was imaged with the Antlia Triband RGB from my house. 

Nice imaage