Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

stargazine_ep21_banner.thumb.jpg.d744e66b98367f1c5d57b7966c303f1b.jpg

Russe

Imaging with the 130pds

Recommended Posts

On 13/07/2018 at 11:31, pipnina said:

Finding this thread just makes me more excited for the coming darkness! I got to do a few tests with my 130-PDS (hopefully I've got the hang of it all now!) during and just before summer twilight. Not sure what I'm going to photograph first though. My camera has pitiful Ha response (One day I'll complete the build with OAG and a cooled CMOS...) and the central milky way nebulae (M8, M16 etc) are too low down for me to image (without exposing the precious to the road and pavement... and street lamp glare!)

On a side note, has anyone else found the 130-PDS prone to stray light? In an image I took recently I noticed a gradient in the image that seemed too "sharp" to be vignetting or sky gradients. (The glowing pale lobe to the left hand side)

Are there measures that can be taken to prevent this?

Yep,  @carastro mentionned she has the same problem with stray light, she noticed it while taking darks during a daytime.
 

Share this post


Link to post
Share on other sites

Hi everyone, fantastic shots everyone is getting

My 130PDS is currently in storage until next month but cannot wait to get it back on the mount and start imaging with it again.

Has anyone replaced the secondary mirror on the 130PDS with a larger one to help with vignetting?
I have just won an ebay auction for a 200p spider to replace the one I currently have that has kink in it.
The auction also comes with a secondary mirror, I was thinking about replacing the secondary on the 130 with the spare I will have from a 200p

Any thoughts on this?

regards

Mark

Share this post


Link to post
Share on other sites

Just tried out pixinsight on my photos (transformed my M31 pics), I am loving my 130pds more and more

1CF6AEA4-3818-410B-ABD4-F1F1A44426ED.jpeg

5CF87A2B-13ED-491F-9DAD-A0959F0EB787.jpeg

  • Like 3

Share this post


Link to post
Share on other sites
9 hours ago, dyfiastro said:

Hi everyone, fantastic shots everyone is getting

My 130PDS is currently in storage until next month but cannot wait to get it back on the mount and start imaging with it again.

Has anyone replaced the secondary mirror on the 130PDS with a larger one to help with vignetting?
I have just won an ebay auction for a 200p spider to replace the one I currently have that has kink in it.
The auction also comes with a secondary mirror, I was thinking about replacing the secondary on the 130 with the spare I will have from a 200p

Any thoughts on this?

regards

Mark

 

Be carefull with that change, as far as I remember the 130PDS secondary mirror axis is 46mm long. So you shouldn´t use any secondary larger than 50 or 52mm. Think that on one side you reduce vignetting but on the other you reduce the amount of incoming light.

The vignetting can be erased with flats, anyway if you take a look to my last pictures they have been calibrated without flats, as the PixInsight DBE tool makes miracles.

Cheers.

Share this post


Link to post
Share on other sites
4 hours ago, Susaron said:

 

Be carefull with that change, as far as I remember the 130PDS secondary mirror axis is 46mm long. So you shouldn´t use any secondary larger than 50 or 52mm. Think that on one side you reduce vignetting but on the other you reduce the amount of incoming light.

The vignetting can be erased with flats, anyway if you take a look to my last pictures they have been calibrated without flats, as the PixInsight DBE tool makes miracles.

Cheers.

Thanks for the reply. From what I can see the 200p secondary mirror is 52mm, so should fall within tolerance.
I have been removing the Vignetting with flats and using DBE however having the secondary in effect for free, I thought it may just help a little to get better images out of camera.
 

Share this post


Link to post
Share on other sites
On 13/07/2018 at 11:31, pipnina said:

On a side note, has anyone else found the 130-PDS prone to stray light? In an image I took recently I noticed a gradient in the image that seemed too "sharp" to be vignetting or sky gradients. (The glowing pale lobe to the left hand side)

Are there measures that can be taken to prevent this?

Hi

Wilko do a cheap self-adhesive felt that you can use to flock the scope and also placing thick card on the rear mirror helps with light leak.

 

Mark.

Share this post


Link to post
Share on other sites

I flocked mine (including the drawtube), made a cover for the bottom and use a flocked dewshield. Also I take flats with the dewshield in place and use a light source not too bright, and slightly backed off (a large monitor helps). Also helps to diffuse the light a bit more with copier paper -  epecially important if your monitor or other light source has a slightly reflective screen/cover.

Share this post


Link to post
Share on other sites

Dear 130PDS friends.

Last Friday with quarter Moon we went to the La Mancha fields as this year we are not suffering in our spanish skies from clouds of Sahara´s dust.

I did shoot 3 objects from 23h to 4AM, first was this M17 and M18 couple. I changed the position of the camera and my mistake was not to recalibrate PHD2, so I found some small trails on all my subs.

The M17 & M18 is a stack of 27x180 subs with the QHY168C at Gain 10, Offset 30, Temp = -10C. Processed with Pix.

Clear skies.

Mario.

M17_resamp_30.jpg

  • Like 4

Share this post


Link to post
Share on other sites

Second picture from the same night, the Moon was then out.

A Crescent Nebula 27x180s subs, definitely it needs longer subs in order to catch fine details inside the nebula.

intNGC6888_resamp30_recorte.jpg.c54b2bdf791fa2765d6d261eeb9304a8.jpgintNGC6888_resamp30.thumb.jpg.e5f3beec59870026f54539d77b51de5b.jpg

  • Like 4

Share this post


Link to post
Share on other sites

And the last image from the same night a duo M52 + C11 (NGC7635) Bubble Nebula. 24x180s subs processed with Pix.

QHY168C (Gain 10 Offset 30 Temp -10ºC) + AZEQ5 + SW130PDS Moonlite tuned + IDAS D1 + Baader MPCC + ASI385MC + 30mm guidescope.

Cheers.

intM52_crop_rotated_50.jpg

  • Like 5

Share this post


Link to post
Share on other sites

When it comes to dew shields, what are you guys using? Off-the-shelf solutions or something more DIY?

Share this post


Link to post
Share on other sites

130P-DS Camp mat - rolled into a tube, stuck with superglue, ringed with gaffer tape, and lined with flock.

150PL never seems to need one.

C90 Mak - 3D printed tube, lined with flock.

Share this post


Link to post
Share on other sites
On 22/07/2018 at 23:12, pipnina said:

When it comes to dew shields, what are you guys using? Off-the-shelf solutions or something more DIY?

Honestly have not needed one since I started using my obsy but before that I made a DIY one. 

Share this post


Link to post
Share on other sites

I've not needed one for the 130-PDS yet! I am sure it'll happen one day though and I will be unprepared....

Share this post


Link to post
Share on other sites

my DIY: Opened a cereal box flat, black felt stuck on inside, adhesive velcro bands on outside, et Hop ?

Goes around my 130PDS as well as MAK127.

Share this post


Link to post
Share on other sites

My Dew shield is a section of camping mat cut to size and lined with flocking material.
Industrial sticky back velcro to connect the two ends. I have since made another for the guide scope as well.

Here is a quick shot from a while back showing it.

IMG_20170325_184755.thumb.jpg.8a55174497461a2889477d476ae7d13b.jpg

  • Like 3

Share this post


Link to post
Share on other sites

Here is a image of Ngc6960 from Friday night taken in my back garden consists of 

Heq5 mount 

Skywatcher 130pds 

9x50 guide scope 

Zwo asi120 

Canon 450d modded 

17x240s lights

10x240s darks 

_20180812_094913.JPG

IMG_20180811_200654_274.jpg

  • Like 8

Share this post


Link to post
Share on other sites
On 27/07/2018 at 12:32, dyfiastro said:

My Dew shield is a section of camping mat cut to size and lined with flocking material.
Industrial sticky back velcro to connect the two ends. I have since made another for the guide scope as well.

Here is a quick shot from a while back showing it.

IMG_20170325_184755.thumb.jpg.8a55174497461a2889477d476ae7d13b.jpg

where did you get the little bag covering the primary end of the tube?

  • Like 1

Share this post


Link to post
Share on other sites

We need a show us your 130_DS thread, or at least more pics here! I will take one next time I set up - hopefully tomorrow!

 

  • Like 3

Share this post


Link to post
Share on other sites
On 15/08/2018 at 17:25, Adam J said:

where did you get the little bag covering the primary end of the tube?

Ha that is a simple bit of grey / black doubled over cotton with some Knicker elestic around the outside.
I have a small section of of the left over camping mat inside it and it cuts out any stray light from behind (at this point I was still setting up each night and the laptop was always setup behind it).

The normal process was to take it off at the beginning of the night before imaging to allow the scope to cool and then put it on before starting a run.
Now I am in the obsy, its sits on the end of the scope all the time and only comes off for collimation.

Share this post


Link to post
Share on other sites
9 hours ago, dyfiastro said:

Ha that is a simple bit of grey / black doubled over cotton with some Knicker elestic around the outside.
I have a small section of of the left over camping mat inside it and it cuts out any stray light from behind (at this point I was still setting up each night and the laptop was always setup behind it).

ScopeKnickers are the unique and innovative way to protect your precious optics and keep them in perfect condition:

  • Unique 'patent pending' elasticated waistband ensures a perfect fit around your OT to within 1/8 wave PV.
  • Impervious to rain, honeydew, bat droppings and errant drones.
  • Innovative 'left over camp-mat technology' means you never get a cold fundament.
  • Stray Light Absorption(TM) improves your viewing by 178% while combatting coma, astigmastism and bad breath*
  • Genuine Egyptian Cotton harvested under a dark sky lets your mirror breathe.
  • Super stretchy elastic to ISO9000 will never leave you with droopy draws.
  • SAS Black/Grey design to preserve your night vision under the most arduous conditions.
  • Also functions as a hairnet when preparing food for star parties.
  • Only $375! Take yours to the checkout now!

*in independent tests 9 out of 10 cats found they didn't notice any of these issues while playing with ScopeKinckers.

 

  • Haha 5

Share this post


Link to post
Share on other sites

Hi,

I have recently started to get the secondary mirror on my 130pds dew up pretty fast and am wondering if one of these heaters would be suitable? I am just a little unsure on how to measure the stalk as there are two sizes available. I also already use a dew shield  which has helped but not stopped the problem on the bad nights. 

https://www.teleskop-express.de/shop/product_info.php/language/en/info/p8593_AST-Heizmanschette-fuer-geklebte-Fangspiegel-mit-Halter-D-50-mm.html

https://www.teleskop-express.de/shop/product_info.php/info/p8571_AST-Heater-for-glued-Newtonian-secondary-mirrors-with-holder-D-31-mm.html

The product also states for a 'glued secondary mirror' is that what the 130pds has?

Any help would be much appreciated.

Ross

Share this post


Link to post
Share on other sites

Hi,

Im not aware I ever posted this one up--M81 and 82, just over 1 hour 300 sec subs at ISO 800 I believe, unmodded 1000d on EQ5 non GoTo, autoguiding. This is the best result I've got so far, as I've been having  big issues with every aspect of the setup since then. However, they are gradually being resolved one by one so any day now it will be back into service! :) 

2019669403_M8182.thumb.jpg.af2f6af843bcc162e208232e1d78feb7.jpg

John

  • Like 7

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   1 member

  • Similar Content

    • By hukay
      Bought this mount for a cheap price and I found out that there is something missing...maybe a gear???
      I need your expertise on where to get parts for my  mount or anyone who can 3D print the parts? 


    • By lkimber
      I know it may be a bit of a long shot but I'm looking to buy a HEQ5 Pro mount or an NEQ6 Pro or something similar. Preferably belt driven but not necessary as can happily modify it. Please let me know if you have anything! Thanks.
    • By javaruba
      Hi folks,

      I just upgraded my main imaging scope to a Sky-Watcher Esprit 100Ed. I'm currently looking for ideas to attach my 60mm guide scope and mini-PC with Pegasus Powerbox on top of the main scope. Probably an additional plate might help help?
      Anyone mind sharing some pictures as a reference?

      Many thanks in advance.

      Jairo
    • By Andrew Bennett
      Hi
      I have a Skywatcher Newtonian telescope ( D:200, f:1000) The other day I noticed that the 'O' ring which was attached to the finder scope had broken.  After a bit of digging around, I obtained what I believe is the correct size replacement ( 1.5 mm thickness, 52mm internal diameter).  However, I can't see how it attaches to the finder scope !  Can anyone offer some guidance ?  Many thanks in advance.
      Andrew
    • By Dubliner
      Hi,
      I have a Skywatcher 8inch Flexi/collapsible Auto tracking Dob of 10 years vintage and recently 'upgraded' it with the Skywatcher Wifi plug in module in place of the mini handset and now it is a Goto. This is not an officially approved upgrade - but it works. My question is to anyone out there who did the same upgrade - perhaps by plugging a Goto handset which some did about 9 years back and if they ever tried to update the motor control firmware and with what results. 
      The MC version on my Dob shows as version 2.12.90 but a newer version on Skywatcher site is available but I'm afraid to risk it without asking around. 
      Optional read - some background and why I ask the question above :
      Been away from the hobby a long time for various reasons so decided to wake up my 8" Auto Dob from years of storage. This was bought about 10 years ago and was just about a year prior to the release of a Goto version. Some folk around here found that using a goto handset (from the Skywatcher range) were able to make their Auto in a Goto by merely replacing the mini handset that came with the Auto Dob. Not wanting to risk the then £150 or more a handset that may or may not work  I forgot the matter - that was 9 years ago. There was a lot of discussion back then that the Auto version was really meant to be a Goto but that the motors were not accurate enough or the software was too buggy and Skywatcher got cold feet and dropped the Goto functionality and sold it as a tracking Dob and great scope it is. Returning now I took a gamble on plugging one of their wifi modules (in place of the mini handset) and hey presto it works! Fantastic!
      Trying it out indoors (what choice with our weather) and just going on an digital inclinometer ( the Azm looks good) it was getting on most 'targets' to within 1 degree and often spot on. Outdoors on the only 2 occasions I had in the last month it was a little disappointing in that it was often missing by 5 or 10 degree both in Alt and Azm. I've done all the leveling, alignments, adjusting the clutch and balancing of the OTA from old posts here on the topic and it did help.
      A few days ago I read that disabling the auxiliary encoders can really help in getting better and more consistent gotos. My understanding is that they come into play for allowing for manual movements or it the tube gets knocked accidentally in use . The Synscan App has this option but it is not selectable for me maybe because of the old MC firmware I have. This newest version of the on the Skywatcher site states "Firmware: Skyliner Series Dobsonian GO-TO Mounts, Version 2.09 -For 8" to 16" Dobsonian GOTO mounts. Support turning off auxiliary encoders". 
      So I loaded the windows software to flash the MC firmware and got the new version mentioned above but I chickened out on pressing the 'update' button! I'd hate to brick the electronics as this scope was never originally designed as a Goto anyway and it old electronically speaking,  so I may be pushing my luck too far as it may not like being flashed over. I am happy with what I have so why risk it - but the temptation is killing me to be more happier! 
      Sorry for rambling on a bit.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.