Imaging with the 130pds

[alacant]

41 minutes ago, pipnina said:

a calibrated image

 

Hi

No time to do it justice I'm afraid, but it looks like the flat frames are working fine:

Edited April 14, 2022 by alacant

[pipnina]

13 minutes ago, alacant said:

Hi

No time to do it justice I'm afraid, but it looks fine to me. The flat frames are working perfectly:

But then if I abuse them (as I tend to by the time I am processing it, with the heavy stretching and bringing out of faint detail etc) it rears its head in at least some form!

Here's a stretch of the full master light (so multiple nights worth of lum data, all under a new moon so no interference there). It seems to manifest here in the form of a brightness plateau in the center of the screen. If I run DBE in pixinsight, the image is largely nicely flat but the central plateau is now almost pinched.

Now this could be boiled down to inconsistencies between nights perhaps, if it wasn't appearing in more of my images! this example is of only a single night.

I figure it's either reflections in the tube or the baader mpcc coma corrector?

I have no idea precisely.

[Bibabutzemann]

On 14/04/2022 at 18:38, pipnina said:

But then if I abuse them (as I tend to by the time I am processing it, with the heavy stretching and bringing out of faint detail etc) it rears its head in at least some form!

Here's a stretch of the full master light (so multiple nights worth of lum data, all under a new moon so no interference there). It seems to manifest here in the form of a brightness plateau in the center of the screen. If I run DBE in pixinsight, the image is largely nicely flat but the central plateau is now almost pinched.

Now this could be boiled down to inconsistencies between nights perhaps, if it wasn't appearing in more of my images! this example is of only a single night.

I figure it's either reflections in the tube or the baader mpcc coma corrector?

I have no idea precisely.

Your flats are working nicely. Both of your image show a typical light pollution gradient coming from south direction.

I noticed that your single frame has only  little light pollution compared to my single frames. 

I dont know how much you stretched to make it so obvious. 

I also get this weird uneven background, when i stretch my final image too much after doing Background Extraction in Siril, but it doesnt look so strong line in your image. But maybe you just stretch differently.

 

 

Edited April 15, 2022 by Bibabutzemann

[spillage]

@alacant

 

will removing the primary clips do away with the need for an additional ring?

 

cheers

Mark.

[alacant]

12 minutes ago, spillage said:

additional ring

Additional ring, where? 

 

[spillage]

Sorry should have been clearer. I have a 3d printed ring ready to fit on top of the clips but would removing the clips remove this need.

[Bibabutzemann]

@pipnina could you solve your issue with the blotchy background? 

I started a new thread about this issue. To have some comparison, it would be awesome if you could stack your flats, but additive to enhance the problem.  If you send me that image i could compare it to mine and see if its the same problem. 

I found out that the shape of the that complex gradient changes when i move the focuser in or out.
Here is the gif which shows what happens when i move the focuser from all in to out. It contains 9 frames. Each fram is a additive stack of 20 flats and vignetting removed:

 

 

[alacant]

On 20/04/2022 at 20:30, spillage said:

would removing the clips remove this need.

Hi. Yes. 

[pipnina]

3 hours ago, Bibabutzemann said:

@pipnina could you solve your issue with the blotchy background? 

I started a new thread about this issue. To have some comparison, it would be awesome if you could stack your flats, but additive to enhance the problem.  If you send me that image i could compare it to mine and see if its the same problem. 

I found out that the shape of the that complex gradient changes when i move the focuser in or out.
Here is the gif which shows what happens when i move the focuser from all in to out. It contains 9 frames. Each fram is a additive stack of 20 flats and vignetting removed:

 

 

I did not know of this effect! I will definitely have to start doing my flats properly (before not after imaging session) from now on, because while I don't touch the focus position before imaging, the scope probably warms rather considerably if i let it sit in the sun in the daytime.

[Bibabutzemann]

Flaming Star Nebula captured in February.

I collected 12 hours of data with the L-Extreme Filter and only 1.5 hours of RGB for the stars.

Equipment: 130PDS+EOS1200D+MPCC3+EQ3 Pro

Processed in Siril+Photoshop

 

 

Edited April 25, 2022 by Bibabutzemann

[Jamgood]

1 hour ago, Bibabutzemann said:

Flaming Star Nebula captured in February.

I collected 12 hours of data with the L-Extreme Filter and only 1.5 hours of RGB for the stars.

Equipment: 130PDS+EOS1200D+MPCC3+EQ3 Pro

Processed in Siril+Photoshop

 

 

Very nice. 👍

[Pitch Black Skies]

First attempt at a globular cluster, 1hr 40mn

Hercules Globular Cluster (M13)

 

[Bibabutzemann]

M94 

5.3 hours of Data, Bortle 5 sky

For background extraction i used a new tool. Its called Graxpert and is completely free. Works fantastic. German youtuber astrophotocologne initiated the project and he also published a tutorial in english just yesterday.

Equipment: 130PDS+MPCC3+EOS1200DA cooled+HEQ5

 

Edited April 27, 2022 by Bibabutzemann

[edarter]

Can someone tell me what removing the x4 rubber grommets on the focusser achieves? I've had a quick skim through the last few pages of this thread but not seen any explanation.

Thanks

[g-rex]

A few from the last few sessions.

All took with,

130 PDS.

Exos 2 using Onstep

Altair 269c Pro Tec

APT, DSS and Startools

 

 

 

[Pitch Black Skies]

Folks,

Lets see your 130P-DS in action and how you've modified it.

Always interested to see how others use and modify theirs.

Edited May 1, 2022 by Pitch Black Skies

[astroenthusiast]

Beautiful! 

[astroenthusiast]

On 25/04/2022 at 17:42, Bibabutzemann said:

Flaming Star Nebula captured in February.

I collected 12 hours of data with the L-Extreme Filter and only 1.5 hours of RGB for the stars.

Equipment: 130PDS+EOS1200D+MPCC3+EQ3 Pro

Processed in Siril+Photoshop

 

 

Very nice work!

[Jamgood]

Here's mine ready for action. 

(I hadn't got the dew shield on for the photo but I do use one.)

[Pitch Black Skies]

9 minutes ago, Jamgood said:

(I hadn't got the dew shield on for the photo but I do use one.)

Very nice set up 👌🏻

I leave mine on all the time as I do my flats with it in place.

I see you have one on the guidescope. Can they be bought?

[Richard Wesson]

On 01/05/2022 at 13:16, Pitch Black Skies said:

Folks,

Lets see your 130P-DS in action and how you've modified it.

Always interested to see how others use and modify theirs.

What dewshield is that?

[Pitch Black Skies]

33 minutes ago, Richard Wesson said:

What dewshield is that?

Hi Richard,

https://www.teleskop-express.de/shop/product_info.php/info/p8075_TS-Optics-flexible-Taukappe-fuer-Teleskope-mit-einem-Au-en--Tubusdurchmesser-von-140-bis-180-mm.html

[alacant]

ssh tunnel at the ready, waiting for astro darkness...

... in the local bar;)

[Pitch Black Skies]

@alacant Nice rig! 

Wish I lived somewhere like Spain ☀️

Edited May 2, 2022 by Pitch Black Skies

[Jamgood]

20 hours ago, Pitch Black Skies said:

I see you have one on the guidescope. Can they be bought?

I honestly don't know. I made this one myself out of cardboard and gaffer tape but you probably can buy them.