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.

  • Announcements

    sgl_imaging_challenge_banner_nb_dso.jpg.eb6cd158659331fd13e71470af6da381.jpg

gorann

NGC7822 & Co - Wide field and close up, side by side

Recommended Posts

gorann    1,386

Here is the wide field taken with the 135mm Samyang (@ f/2) sitting side by side with the 5" reflector (which simultaneously took the close up of NGC7822 that I previously posted). Not sure if this was the best object for a wide field since and it was a bit odd to process such an undersampled image (6.6 "/pixel) with so many stars. Still, I got it for "free" while I took the close up with the 5" apo.

I post also the close up for comparison.

Equipment: Samyang 135 f/2 with a Canon 70D (ISO 1600) side by side with a ES 127ED apo and a Canon 60Da. All on an EQ8 on a pier in the obsy. Guided with PHD2 and a SW80 with a QHY 5LIIM.

Exposures: Samyang 100 x 1 min. ES127  31 x 8 min (both at ISO1600)

Comments most welcome!

Cheers

 

 

IMG9468-9569 PS20sign.jpg

IMG2838-67PS39sign.jpg

Edited by gorann
  • Like 9
  • Thanks 1

Share this post


Link to post
Share on other sites
gorann    1,386
1 hour ago, MartinFransson said:

Nice work on that combo! To be honest, I actually like the widefield more. Might have to get myself one of those Samyangs :)

Tack Martin!

yes, those Samyangs 135 are possibly the best. Somehow they have managed to get rid of almost all coma even at full opening (pixel peepers will see a tiny bit in the corners), and for a very reasonable price. Also, with an APS-C there is not much vignetting (some is there but in this case I did not see the need for the flats I took - a run of Gradient Exterminator was enough).

Edited by gorann

Share this post


Link to post
Share on other sites
gorann    1,386
4 minutes ago, Uranium235 said:

Samyang.... class glass indeed :)  Smashing pics btw.

Thanks Rob, much appreciated!

Share this post


Link to post
Share on other sites
gorann    1,386
On 9/24/2017 at 21:39, MartinFransson said:

Nice work on that combo! To be honest, I actually like the widefield more. Might have to get myself one of those Samyangs :)

Martin,

I am thinking about putting a bid on an Canon EF 300/4L on ebay. Can you recommend it?

Cheers

Share this post


Link to post
Share on other sites
gorann    1,386
On 9/28/2017 at 17:00, jjosefsen said:

Wow..!

 

12 hours ago, Rodd said:

A very intriguing palette.  Great depth.

Rodd

Thank you both!

Cheers

Share this post


Link to post
Share on other sites
lux eterna    100

Hej Göran,

I really like that wide field image ! Having such a Samyang myself, I am beginning to appreciate those dense star fields more and more.

CS

Ragnar

Share this post


Link to post
Share on other sites
gorann    1,386

Hej Ragnar & Tack!

Yes I am so impressed with that little lens, almost without coma at full aperture, but at the same time I am slightly overwhelmed when processing so many undersampled stars. Quite different from working on my telescope images. I am now letting it sit side by side with whatever scope I am using to get additional data to work on.  The Samyang can also grab some interesting images when my main scope is directed against far away galaxies with much less dense star fields, see this thread:

However, the Samyang is about to get a competitor. I am now waiting for a semi-wide field lens that I bought on ebay to arrive from Japan (the parcel tracking shows it is right now at Stockholm customs). It is a Canon EF 300mm F/4 L USM, which in some reviews is claimed to be the sharpest telephoto lens ever made by Canon and superior to the new and more expensive IS version that has a bunch of additional lenses in the light path for the image stabilization. I also think it is a bargain. It is supposedly in Excellent++ condition, so I hope to receive a near to new 75 mm f/4 apo refractor with a large fully flat field (made for full frame DSLRs) for about 500 Euro. And it only weighs about 1.3 kilo.

 

Share this post


Link to post
Share on other sites
gorann    1,386
22 hours ago, PatrickGilliland said:

NIce work Goran looks like another great Samyung being well used there.

Thanks Paddy!

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   0 members

    No registered users viewing this page.

  • Similar Content

    • By gorann
      Some of you may have seen my post yesterday of this object in wide field taken with the 135mm Samyang (@ f/2) and a Canon 70D (unmodded). That same night I run the camera both before and after the meridian flip but the framing then became quite different (I focused on maintaining the framing of the 5" refractor sitting side by side and had no separate control of the Samyang). So, I decided to process the data from after the flip separately as I had quite a large number of exposures to keep the S/N ratio high and did not want to do a major crop. When I now processed the data I collected after the flip (81 x 1 min at ISO1600), I more or less consciously put more emphasis on bringing out any surrounding nebulosity and not suppressing the star filed, and the result is remarkably different. I post the image from after the flip (top) and before the flip (bottom = same as I posted recently).
      Maybe it shows that I am not very consistent in my processing and run more on inspiration than a consistent workflow. Maybe I should be worried about this?
      Stacking in Nebulosity 4 and processing in PS CS5.
      Do you guys also like the top image better? I think I do - at least right now.


    • By gorann
      Finally last night the sky cleared, the moon was below the horizon and there was 6-7 hours of astro-darkness up here. So here is the first data I have captured this season.
      Gear: ES 127ED apo, Canon 60Da, EQ8 mount. 31 x 8 min, so 4.1 hours. Stacked in Nebulosity 4 and prosessed in PS CS5
      I also had my Samyang 135 f/2 with a Canon 70D side by side (hopefully 100+ good 1 min exposures). Will have a look at that data later today (when I may be exposing again, weather permitting)
      All comments and suggestions most welcome!
      Cheers
       

×