Imaging with the 130pds

[Albir phil]

On 27/02/2016 at 00:34, StamosP said:

How can i be sure that they are not twisted, even slightly? Is there a method?

As i can see by eye they are not...

 

On 26/02/2016 at 19:22, StamosP said:

Hello again,

i've noticed that around bright stars the diffraction spikes appear to split in two (for example my m45 pic, page 31).

How can i fix that?

I've tried to align the spider vanes perfectly and i think i've done it but the problem remains...

I have the 150 quattro I upgrade it with a new spider and primary mirror  mask this is a much stronger one and the mask removes the reflection from the main mirror clips.i got mine from Backyard Univers,it cost me 220€ inc postage.

[woldsman]

 

The Owl Nebula (M97) - imaged during  a 77% illuminated waxing gibbous Moon on 18th May with just a few hours of true darkness. Atik 414ex camera: Ha 18 x 300” & O3 18 x 300”.

 

 

 

Edited May 27 by woldsman

[woldsman]

First image after the return of true darkness. Bubble Nebula captured with a Canon Eos 100d. 73 x 180” on 27 July.

 First time using the SW Aplanatic coma corrector.

[8472]

My 130P-DS seems to have recently developed a case of rather ugly star halos, not present in some of my previous images.

Here's a 290% crop from a recent luminance stack.

Other than flocking, shortening my drawtube to get rid of Pacman stars, and shifting the primary further up the OTA to compensate, nothing else has changed.

Would a primary mirror aperture mask to fix this?

Thanks

[8472]

On 02/09/2024 at 19:35, 8472 said:

My 130P-DS seems to have recently developed a case of rather ugly star halos, not present in some of my previous images.

Here's a 290% crop from a recent luminance stack.

Other than flocking, shortening my drawtube to get rid of Pacman stars, and shifting the primary further up the OTA to compensate, nothing else has changed.

Would a primary mirror aperture mask to fix this?

Thanks

Mystery solved.

Looking back at my previous images with this scope, it seems the large majority were NB images. With that, brought smaller stars and much less evidence of halos.

It seems I do have a very small sample size of colour images, and they do to a greater or lesser degree exhibit the same phenomenon.

Despite that, here my latest with the 130P-DS.

9.75h RGB with my FF DSLR and 8" OTA

11.05h M4/3 mono Luminance with my 130P-DS